BUILDING TECHNOLOGIES OFFICE

R

BUILDING AMERICA BEST PRACTICES SERIES

VOLUME 7.3

Guide to Determining 

Climate Regions by County 

Pacific Northwest National Laboratory

August 2015 

BUILDING AMERICA BEST PRACTICES SERIES

VOLUME 7.3

High-Performance Home Technologies:

Guide to Determining 

Climate Regions by County

PREPARED BY

Pacific Northwest National Laboratory

Michael C. Baechler

Theresa L. Gilbride, Pam C. Cole, Marye G. Hefty, and Kathi Ruiz

August 2015

Prepared for the U.S. Department of Energy

under Contract DE-AC05-76RLO 1830

PNNL-17211 Rev. 3

This report was prepared as an account of work sponsored by an agency of the United States 

Government. Neither the United States Government nor any agency thereof, nor Battelle 

Memorial Institute, nor any of their employees, makes any warranty, express or implied, or 

assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of 

any information, apparatus, product, or process disclosed, or represents that its use would not 

infringe privately owned rights. Reference herein to any specific commercial product, process, 

or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute 

or imply its endorsement, recommendation, or favoring by the United States Government or 

any agency thereof, or Battelle Memorial Institute. The views and opinions of authors expressed 

herein do not necessarily state or reflect those of the United States Government or any agency 

thereof.
You can learn more about Building 

America and download additional copies 

of this document, other best practices, 

research reports, and case studies at 

www.buildingamerica.gov

R

Preface

This guide to climate zones is an update to Volume 7.2 in the Best 

Practices series of guides for home builders produced by the U.S. 

Department of Energy’s Building America Program. This guide 

describes the climate zone designations used by Building America 

and compares them with the climate zone designations used in the 

International Energy Conservation Code (IECC). 

Building America welcomes reader feedback on all volumes of the 

Best Practices Series. Please submit your comments via e-mail to 

basc@pnnl.gov

i Volume 7.3. Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015 Guide to Determining Climate 

Regions by County

This report describes the climate zone designations used by the 

U.S. Department of Energy Building America Program. The report 

is intended as an aid in helping builders to identify the appropriate 

climate designation for the counties in which they are building. The 

guide can be used in conjunction with guidance in the Building 

America Solution Center and the Best Practices builders’ guides 

produced by the DOE Building America Program to help builders 

determine which climate-specific guidance they should use.

The eight U.S. Building America climate regions described here 

are based on the climate designations used by the International 

Energy Conservation Code (IECC) and the American Society of 

Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). 

The IECC climate zone map was developed by DOE researchers 

at Pacific Northwest National Laboratory with input from 

Building America team members, in particular Joseph Lstiburek 

of Building Science Corporation.a,b The IECC map was developed 

to provide a simplified, consistent approach to defining climate for 

implementation of various codes; it was based on widely accepted 

classifications of world climates that have been applied in a variety 

of different disciplines. The PNNL-developed map was adopted by 

the IECC and was first included in the IECC in the 2004 Supplement 

to the IECC. It first appeared in ASHRAE 90.1 in the 2004 edition. 

The IECC map divided the United States into eight temperatureoriented climate zones. These zones are further divided into three 

moisture regimes designated A, B, and C. Thus the IECC map allows 

for up to 24 potential climate designations. 

In 2003, with direction from the Building America teams, researchers 

at DOE’s National Renewable Energy Laboratory simplified the 

IECC map for purposes of the Building America Program, into eight 

climate zones. For reporting purposes, these are further combined 

into five climate categories: Hot-humid, hot-dry/mixed dry, mixedhumid, marine, cold/very cold, and subarctic.c

The Building America and IECC climate maps are shown in Figures 

1 and 2. The climate regions are described below. Climate zone 

boundaries follow county boundary lines. A listing of counties 

comprising each climate zone is provided below, beginning on page 5. 

The climate region definitions are based on heating degree days, 

average temperatures, and precipitation as follows: 

The table at the end of this document 

contains the complete listing of U.S. 

counties in alphabetical order by state, 

then county, then Building America 

climate region, and IECC climate region.

a Briggs RS, ZT Taylor, and RG Lucas. 2003. 

“Climate Classification for Building Energy 

Codes and Standards.” Presented by Z. Todd 

Taylor and Robert G. Lucas at the ASHRAE 

Winter Meeting, Chicago, IL, on January 28, 

2003. PNNL-SA-37941, prepared by Pacific 

Northwest National Laboratory (PNNL), 

Richland, WA.

b Personal communication with Z. Todd Taylor 

and Mark Halverson, PNNL, 8-18-2010, and 

Robert Hendron, National Renewable Energy 

Laboratory (NREL), 8-18-2010.

c Personal communication, Robert Hendron, 

NREL, 8-18-2010.

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 1

BUILDING AMERICA BEST PRACTICES SERIES
1

2 2

2 3

3

4

4

5 5

6

6

7

Marine (C)

Dry (B) Moist (A)

All of Alaska in Zone 7

except for the following

Boroughs in Zone 8:

Bethel

Dellingham

Fairbanks N. Star

Nome

North Slope

Northwest Arctic

Southeast Fairbanks

Wade Hampton

Yukon−Koyukuk

Zone 1 includes

Hawaii, Guam,

Puerto Rico,

and the Virgin Islands

Warm−Humid

Below White Line

HOT-HUMID

MIXED-HUMID

COLD / VERY COLD

HOT-DRY / MIXED-DRY

MARINE

Figure 1. Seven of the eight US climate 

zones recognized by Building America 

occur in the continental United States. 

The sub-arctic U.S. climate zone, not 

shown on the map, appears only in Alaska.

Figure 2. International Energy Conservation 

Code (IECC) climate regions

All of Alaska is in Zone 7 except for 

the following boroughs which are in 

Zone 8: Bethel, Dellingham, Fairbanks 

N. Star, Nome, North Slope, Northwest 

Arctic, Southest Fairbanks, Wade 

Hampton, Yukon-Koyukuk

Warm-Humid 

Below White Line

Zone 1 includes Hawaii, 

Guam, Puerto Rico, and 

the Virgin Islands

Climate Zone

= 1

= 2

= 3

= 4

= 5

= 6

= 7

2 Volume 7.3. Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Heating Degree Days

The degree-day measurement is the 

difference in temperature between the 

mean (average) outdoor temperature 

over a 24-hour period and a given 

base temperature for a building space, 

typically 65°F (25°C in Canada). For 

example, if the mean temperature 

at a given location for January 3 is 

35°F, then the heating degree days 

measurement for that day is 30 

(65 - 35 = 30).

Hot-Humid

A hot-humid climate is defined as a region that receives more than 

20 inches (50 cm) of annual precipitation and where one or both of 

the following occur:

• A 67°F (19.5°C) or higher wet bulb temperature for 3,000 or more 

hours during the warmest six consecutive months of the year; or

• A 73°F (23°C) or higher wet bulb temperature for 1,500 or more 

hours during the warmest six consecutive months of the year.

The Building America hot-humid climate zone includes the portions 

of IECC zones 1, 2, and 3 that are in the moist category (A) below 

the “warm-humid” line shown on the IECC map. 

Mixed-Humid

A mixed-humid climate is defined as a region that receives more than 

20 inches (50 cm) of annual precipitation, has approximately 5,400 

heating degree days (65°F basis) or fewer, and where the average 

monthly outdoor temperature drops below 45°F (7°C) during the 

winter months.

The Building America mixed-humid climate zone includes the 

portions of IECC zones 4 and 3 in category A above the “warmhumid” line. 

Hot-Dry

A hot-dry climate is defined as a region that receives less than 

20 inches (50 cm) of annual precipitation and where the monthly 

average outdoor temperature remains above 45°F (7°C) throughout 

the year.

The Building America hot-dry climate zone corresponds to the 

portions of IECC zones 2 and 3 in the dry category.

Mixed-Dry

A mixed-dry climate is defined as a region that receives less than 

20 inches (50 cm) of annual precipitation, has approximately 5,400 

heating degree days (65°F basis) or less, and where the average 

monthly outdoor temperature drops below 45°F (7°C) during the 

winter months.

The Building America mixed-dry climate zone corresponds to IECC 

climate zone 4 B (dry).

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 3

BUILDING AMERICA BEST PRACTICES SERIES
Cold

A cold climate is defined as a region with between 5,400 and 9,000 

heating degree days (65°F basis).

The Building America cold climate corresponds to the IECC climate 

zones 5 and 6.

Very-Cold

A very cold climate is defined as a region with between 9,000 and 

12,600 heating degree days (65°F basis).

The Building America very cold climate corresponds to IECC 

climate zone 7.

Subarctic

A subarctic climate is defined as a region with 12,600 heating degree 

days (65° basis) or more. The only subarctic regions in the United 

States are in found Alaska, which is not shown in Figure 1.

The Building America subarctic climate zone corresponds to IECC 

climate zone 8.

Marine

A marine climate is defined as a region that meets all of the 

following criteria:

• A coldest month mean temperature between 27°F (-3°C) and 65°F (18°C)

• A warmest month mean of less than 72°F (22°C)

• At least 4 months with mean temperatures higher than 50°F (10°C)

• A dry season in summer. The month with the heaviest 

precipitation in the cold season has at least three times as much 

precipitation as the month with the least precipitation in the 

rest of the year. The cold season is October through March in 

the Northern Hemisphere and April through September in the 

Southern Hemisphere.

The Building America marine climate corresponds to those portions 

of IECC climate zones 3 and 4 located in the “C” moisture category. 

Building America and 

IECC Climate Zones

The table below shows the relationship 

between the Building America and 

IECC climate zones.

Building America IECC

Subarctic Zone 8

Very Cold Zone 7

Cold Zones 5 and 6

Mixed-Humid 4A and 3A 

counties above 

warm-humid line

Mixed-Dry Zone 4B

Hot-Humid 2A and 3A 

counties below 

warm-humid line

Hot-Dry Zone 3B

Marine All counties with 

a “C” moisture 

regime

4 Volume 7.3. Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

ALABAMA

AL Autauga Hot-Humid 3 A

AL Baldwin Hot-Humid 2 A

AL Barbour Hot-Humid 3 A

AL Bibb Mixed-Humid 3 A

AL Blount Mixed-Humid 3 A

AL Bullock Hot-Humid 3 A

AL Butler Hot-Humid 3 A

AL Calhoun Mixed-Humid 3 A

AL Chambers Mixed-Humid 3 A

AL Cherokee Mixed-Humid 3 A

AL Chilton Mixed-Humid 3 A

AL Choctaw Hot-Humid 3 A

AL Clarke Hot-Humid 3 A

AL Clay Mixed-Humid 3 A

AL Cleburne Mixed-Humid 3 A

AL Coffee Hot-Humid 3 A

AL Colbert Mixed-Humid 3 A

AL Conecuh Hot-Humid 3 A

AL Coosa Mixed-Humid 3 A

AL Covington Hot-Humid 3 A

AL Crenshaw Hot-Humid 3 A

AL Cullman Mixed-Humid 3 A

AL Dale Hot-Humid 3 A

AL Dallas Hot-Humid 3 A

AL DeKalb Mixed-Humid 3 A

AL Elmore Hot-Humid 3 A

AL Escambia Hot-Humid 3 A

AL Etowah Mixed-Humid 3 A

AL Fayette Mixed-Humid 3 A

AL Franklin Mixed-Humid 3 A

AL Geneva Hot-Humid 3 A

AL Greene Mixed-Humid 3 A

AL Hale Mixed-Humid 3 A

AL Henry Hot-Humid 3 A

AL Houston Hot-Humid 3 A

AL Jackson Mixed-Humid 3 A

AL Jefferson Mixed-Humid 3 A

AL Lamar Mixed-Humid 3 A

AL Lauderdale Mixed-Humid 3 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

AL Lawrence Mixed-Humid 3 A

AL Lee Mixed-Humid 3 A

AL Limestone Mixed-Humid 3 A

AL Lowndes Hot-Humid 3 A

AL Macon Hot-Humid 3 A

AL Madison Mixed-Humid 3 A

AL Marengo Hot-Humid 3 A

AL Marion Mixed-Humid 3 A

AL Marshall Mixed-Humid 3 A

AL Mobile Hot-Humid 2 A

AL Monroe Hot-Humid 3 A

AL Montgomery Hot-Humid 3 A

AL Morgan Mixed-Humid 3 A

AL Perry Hot-Humid 3 A

AL Pickens Mixed-Humid 3 A

AL Pike Hot-Humid 3 A

AL Randolph Mixed-Humid 3 A

AL Russell Hot-Humid 3 A

AL Shelby Mixed-Humid 3 A

AL St. Clair Mixed-Humid 3 A

AL Sumter Mixed-Humid 3 A

AL Talladega Mixed-Humid 3 A

AL Tallapoosa Mixed-Humid 3 A

AL Tuscaloosa Mixed-Humid 3 A

AL Walker Mixed-Humid 3 A

AL Washington Hot-Humid 3 A

AL Wilcox Hot-Humid 3 A

AL Winston Mixed-Humid 3 A

ALASKA

AK Aleutians East Very Cold 7 N/A

AK Aleutians West 

(CA*)

Very Cold 7 N/A

AK Anchorage Very Cold 7 N/A

AK Bethel (CA) Subarctic 8 N/A

AK Bristol Bay Very Cold 7 N/A

AK Denali Very Cold 7 N/A

AK Dillingham (CA) Subarctic 8 N/A

AK Fairbanks North 

Star

Subarctic 8 N/A

AK Haines Very Cold 7 N/A

*(CA) = Census Area

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 5

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

AK Juneau Very Cold 7 N/A

AK Kenai Peninsula Very Cold 7 N/A

AK Ketchikan Gateway Very Cold 7 N/A

AK Kodiak Island Very Cold 7 N/A

AK Lake and Peninsula Very Cold 7 N/A

AK Matanuska-Susitna Very Cold 7 N/A

AK Nome (CA) Subarctic 8 N/A

AK North Slope Subarctic 8 N/A

AK Northwest 

Arctic

Subarctic 8 N/A

AK Prince of WalesOuter Ketchikan 

(CA)

Very Cold 7 N/A

AK Sitka Very Cold 7 N/A

AK Skagway-HoonahAngoon (CA)Very Cold 7 N/A

AK Southeast Fairbanks (CA)Subarctic 8 N/A

AK Valdez-Cordova 

(CA)

Very Cold 7 N/A

AK Wade Hampton 

(CA)

Subarctic 8 N/A

AK Wrangell-Petersburg (CA)Very Cold 7 N/A

AK Yakutat Very Cold 7 N/A

AK Yukon-Koyukuk 

(CA)

Subarctic 8 N/A

ARIZONA

AZ Apache Cold 5 B

AZ Cochise Hot-Dry 3 B

AZ Coconino Cold 5 B

AZ Gila Mixed-Dry 4 B

AZ Graham Hot-Dry 3 B

AZ Greenlee Hot-Dry 3 B

AZ La Paz Hot-Dry 2 B

AZ Maricopa Hot-Dry 2 B

AZ Mohave Hot-Dry 3 B

AZ Navajo Cold 5 B

AZ Pima Hot-Dry 2 B

AZ Pinal Hot-Dry 2 B

AZ Santa Cruz Hot-Dry 3 B

AZ Yavapai Mixed-Dry 4 B

AZ Yuma Hot-Dry 2 B

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

ARKANSAS

AR Arkansas Mixed-Humid 3 A

AR Ashley Mixed-Humid 3 A

AR Baxter Mixed-Humid 4 A

AR Benton Mixed-Humid 4 A

AR Boone Mixed-Humid 4 A

AR Bradley Mixed-Humid 3 A

AR Calhoun Mixed-Humid 3 A

AR Carroll Mixed-Humid 4 A

AR Chicot Mixed-Humid 3 A

AR Clark Mixed-Humid 3 A

AR Clay Mixed-Humid 3 A

AR Cleburne Mixed-Humid 3 A

AR Cleveland Mixed-Humid 3 A

AR Columbia Hot-Humid 3 A

AR Conway Mixed-Humid 3 A

AR Craighead Mixed-Humid 3 A

AR Crawford Mixed-Humid 3 A

AR Crittenden Mixed-Humid 3 A

AR Cross Mixed-Humid 3 A

AR Dallas Mixed-Humid 3 A

AR Desha Mixed-Humid 3 A

AR Drew Mixed-Humid 3 A

AR Faulkner Mixed-Humid 3 A

AR Franklin Mixed-Humid 3 A

AR Fulton Mixed-Humid 4 A

AR Garland Mixed-Humid 3 A

AR Grant Mixed-Humid 3 A

AR Greene Mixed-Humid 3 A

AR Hempstead Mixed-Humid 3 A

AR Hot Spring Mixed-Humid 3 A

AR Howard Mixed-Humid 3 A

AR Independence Mixed-Humid 3 A

AR Izard Mixed-Humid 4 A

AR Jackson Mixed-Humid 3 A

AR Jefferson Mixed-Humid 3 A

AR Johnson Mixed-Humid 3 A

AR Lafayette Hot-Humid 3 A

AR Lawrence Mixed-Humid 3 A

AR Lee Mixed-Humid 3 A

6 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

AR Lincoln Mixed-Humid 3 A

AR Little River Hot-Humid 3 A

AR Logan Mixed-Humid 3 A

AR Lonoke Mixed-Humid 3 A

AR Madison Mixed-Humid 4 A

AR Marion Mixed-Humid 4 A

AR Miller Hot-Humid 3 A

AR Mississippi Mixed-Humid 3 A

AR Monroe Mixed-Humid 3 A

AR Montgomery Mixed-Humid 3 A

AR Nevada Mixed-Humid 3 A

AR Newton Mixed-Humid 4 A

AR Ouachita Mixed-Humid 3 A

AR Perry Mixed-Humid 3 A

AR Phillips Mixed-Humid 3 A

AR Pike Mixed-Humid 3 A

AR Poinsett Mixed-Humid 3 A

AR Polk Mixed-Humid 3 A

AR Pope Mixed-Humid 3 A

AR Prairie Mixed-Humid 3 A

AR Pulaski Mixed-Humid 3 A

AR Randolph Mixed-Humid 3 A

AR Saline Mixed-Humid 3 A

AR Scott Mixed-Humid 3 A

AR Searcy Mixed-Humid 4 A

AR Sebastian Mixed-Humid 3 A

AR Sevier Mixed-Humid 3 A

AR Sharp Mixed-Humid 3 A

AR St. Francis Mixed-Humid 3 A

AR Stone Mixed-Humid 4 A

AR Union Hot-Humid 3 A

AR Van Buren Mixed-Humid 3 A

AR Washington Mixed-Humid 4 A

AR White Mixed-Humid 3 A

AR Woodruff Mixed-Humid 3 A

AR Yell Mixed-Humid 3 A

CALIFORNIA

CA Alameda Marine 3 C

CA Alpine Cold 6 B

CA Amador Mixed-Dry 4 B

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

CA Butte Hot-Dry 3 B

CA Calaveras Mixed-Dry 4 B

CA Colusa Hot-Dry 3 B

CA Contra Costa Hot-Dry 3 B

CA Del Norte Marine 4 C

CA El Dorado Mixed-Dry 4 B

CA Fresno Hot-Dry 3 B

CA Glenn Hot-Dry 3 B

CA Humboldt Marine 4 C

CA Imperial Hot-Dry 2 B

CA Inyo Mixed-Dry 4 B

CA Kern Hot-Dry 3 B

CA Kings Hot-Dry 3 B

CA Lake Mixed-Dry 4 B

CA Lassen Cold 5 B

CA Los Angeles Hot-Dry 3 B

CA Madera Hot-Dry 3 B

CA Marin Marine 3 C

CA Mariposa Mixed-Dry 4 B

CA Mendocino Marine 3 C

CA Merced Hot-Dry 3 B

CA Modoc Cold 5 B

CA Mono Cold 6 B

CA Monterey Marine 3 C

CA Napa Marine 3 C

CA Nevada Cold 5 B

CA Orange Hot-Dry 3 B

CA Placer Hot-Dry 3 B

CA Plumas Cold 5 B

CA Riverside Hot-Dry 3 B

CA Sacramento Hot-Dry 3 B

CA San Benito Marine 3 C

CA San Bernardino Hot-Dry 3 B

CA San Diego Hot-Dry 3 B

CA San Francisco Marine 3 C

CA San Joaquin Hot-Dry 3 B

CA San Luis Obispo Marine 3 C

CA San Mateo Marine 3 C

CA Santa Barbara Marine 3 C

CA Santa Clara Marine 3 C

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 7

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

CA Santa Cruz Marine 3 C

CA Shasta Hot-Dry 3 B

CA Sierra Cold 5 B

CA Siskiyou Cold 5 B

CA Solano Hot-Dry 3 B

CA Sonoma Marine 3 C

CA Stanislaus Hot-Dry 3 B

CA Sutter Hot-Dry 3 B

CA Tehama Hot-Dry 3 B

CA Trinity Mixed-Dry 4 B

CA Tulare Hot-Dry 3 B

CA Tuolumne Mixed-Dry 4 B

CA Ventura Marine 3 C

CA Yolo Hot-Dry 3 B

CA Yuba Hot-Dry 3 B

COLORADO

CO Adams Cold 5 B

CO Alamosa Cold 6 B

CO Arapahoe Cold 5 B

CO Archuleta Cold 6 B

CO Baca Mixed-Dry 4 B

CO Bent Cold 5 B

CO Boulder Cold 5 B

CO Broomfield Cold 5 B

CO Chaffee Cold 6 B

CO Cheyenne Cold 5 B

CO Clear Creek Very Cold 7 B

CO Conejos Cold 6 B

CO Costilla Cold 6 B

CO Crowley Cold 5 B

CO Custer Cold 6 B

CO Delta Cold 5 B

CO Denver Cold 5 B

CO Dolores Cold 6 B

CO Douglas Cold 5 B

CO Eagle Cold 6 B

CO El Paso Cold 5 B

CO Elbert Cold 5 B

CO Fremont Cold 5 B

CO Garfield Cold 5 B

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

CO Gilpin Cold 5 B

CO Grand Very Cold 7 B

CO Gunnison Very Cold 7 B

CO Hinsdale Very Cold 7 B

CO Huerfano Cold 5 B

CO Jackson Very Cold 7 B

CO Jefferson Cold 5 B

CO Kiowa Cold 5 B

CO Kit Carson Cold 5 B

CO La Plata Cold 5 B

CO Lake Very Cold 7 B

CO Larimer Cold 5 B

CO Las Animas Mixed-Dry 4 B

CO Lincoln Cold 5 B

CO Logan Cold 5 B

CO Mesa Cold 5 B

CO Mineral Very Cold 7 B

CO Moffat Cold 6 B

CO Montezuma Cold 5 B

CO Montrose Cold 5 B

CO Morgan Cold 5 B

CO Otero Mixed-Dry 4 B

CO Ouray Cold 6 B

CO Park Very Cold 7 B

CO Phillips Cold 5 B

CO Pitkin Very Cold 7 B

CO Prowers Cold 5 B

CO Pueblo Cold 5 B

CO Rio Blanco Cold 6 B

CO Rio Grande Very Cold 7 B

CO Routt Very Cold 7 B

CO Saguache Cold 6 B

CO San Juan Very Cold 7 B

CO San Miguel Cold 6 B

CO Sedgwick Cold 5 B

CO Summit Very Cold 7 B

CO Teller Cold 5 B

CO Washington Cold 5 B

CO Weld Cold 5 B

CO Yuma Cold 5 B

8 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

CONNECTICUT

CT Fairfield Cold 5 A

CT Hartford Cold 5 A

CT Litchfield Cold 5 A

CT Middlesex Cold 5 A

CT New Haven Cold 5 A

CT New London Cold 5 A

CT Tolland Cold 5 A

CT Windham Cold 5 A

DELAWARE

DE Kent Mixed-Humid 4 A

DE New Castle Mixed-Humid 4 A

DE Sussex Mixed-Humid 4 A

DISTRICT OF COLUMBIA

DC District of Columbia Mixed-Humid 4 A

FLORIDA

FL Alachua Hot-Humid 2 A

FL Baker Hot-Humid 2 A

FL Bay Hot-Humid 2 A

FL Bradford Hot-Humid 2 A

FL Brevard Hot-Humid 2 A

FL Broward Hot-Humid 1 A

FL Calhoun Hot-Humid 2 A

FL Charlotte Hot-Humid 2 A

FL Citrus Hot-Humid 2 A

FL Clay Hot-Humid 2 A

FL Collier Hot-Humid 2 A

FL Columbia Hot-Humid 2 A

FL DeSoto Hot-Humid 2 A

FL Dixie Hot-Humid 2 A

FL Duval Hot-Humid 2 A

FL Escambia Hot-Humid 2 A

FL Flagler Hot-Humid 2 A

FL Franklin Hot-Humid 2 A

FL Gadsden Hot-Humid 2 A

FL Gilchrist Hot-Humid 2 A

FL Glades Hot-Humid 2 A

FL Gulf Hot-Humid 2 A

FL Hamilton Hot-Humid 2 A

FL Hardee Hot-Humid 2 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

FL Hendry Hot-Humid 2 A

FL Hernando Hot-Humid 2 A

FL Highlands Hot-Humid 2 A

FL Hillsborough Hot-Humid 2 A

FL Holmes Hot-Humid 2 A

FL Indian River Hot-Humid 2 A

FL Jackson Hot-Humid 2 A

FL Jefferson Hot-Humid 2 A

FL Lafayette Hot-Humid 2 A

FL Lake Hot-Humid 2 A

FL Lee Hot-Humid 2 A

FL Leon Hot-Humid 2 A

FL Levy Hot-Humid 2 A

FL Liberty Hot-Humid 2 A

FL Madison Hot-Humid 2 A

FL Manatee Hot-Humid 2 A

FL Marion Hot-Humid 2 A

FL Martin Hot-Humid 2 A

FL Miami-Dade Hot-Humid 1 A

FL Monroe Hot-Humid 1 A

FL Nassau Hot-Humid 2 A

FL Okaloosa Hot-Humid 2 A

FL Okeechobee Hot-Humid 2 A

FL Orange Hot-Humid 2 A

FL Osceola Hot-Humid 2 A

FL Palm Beach Hot-Humid 2 A

FL Pasco Hot-Humid 2 A

FL Pinellas Hot-Humid 2 A

FL Polk Hot-Humid 2 A

FL Putnam Hot-Humid 2 A

FL Santa Rosa Hot-Humid 2 A

FL Sarasota Hot-Humid 2 A

FL Seminole Hot-Humid 2 A

FL St. Johns Hot-Humid 2 A

FL St. Lucie Hot-Humid 2 A

FL Sumter Hot-Humid 2 A

FL Suwannee Hot-Humid 2 A

FL Taylor Hot-Humid 2 A

FL Union Hot-Humid 2 A

FL Volusia Hot-Humid 2 A

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 9

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

FL Wakulla Hot-Humid 2 A

FL Walton Hot-Humid 2 A

FL Washington Hot-Humid 2 A

GEORGIA

GA Appling Hot-Humid 2 A

GA Atkinson Hot-Humid 2 A

GA Bacon Hot-Humid 2 A

GA Baker Hot-Humid 2 A

GA Baldwin Mixed-Humid 3 A

GA Banks Mixed-Humid 4 A

GA Barrow Mixed-Humid 3 A

GA Bartow Mixed-Humid 3 A

GA Ben Hill Hot-Humid 3 A

GA Berrien Hot-Humid 2 A

GA Bibb Mixed-Humid 3 A

GA Bleckley Hot-Humid 3 A

GA Brantley Hot-Humid 2 A

GA Brooks Hot-Humid 2 A

GA Bryan Hot-Humid 2 A

GA Bulloch Hot-Humid 3 A

GA Burke Mixed-Humid 3 A

GA Butts Mixed-Humid 3 A

GA Calhoun Hot-Humid 3 A

GA Camden Hot-Humid 2 A

GA Candler Hot-Humid 3 A

GA Carroll Mixed-Humid 3 A

GA Catoosa Mixed-Humid 4 A

GA Charlton Hot-Humid 2 A

GA Chatham Hot-Humid 2 A

GA Chattahoochee Hot-Humid 3 A

GA Chattooga Mixed-Humid 4 A

GA Cherokee Mixed-Humid 3 A

GA Clarke Mixed-Humid 3 A

GA Clay Hot-Humid 3 A

GA Clayton Mixed-Humid 3 A

GA Clinch Hot-Humid 2 A

GA Cobb Mixed-Humid 3 A

GA Coffee Hot-Humid 3 A

GA Colquitt Hot-Humid 2 A

GA Columbia Mixed-Humid 3 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

GA Cook Hot-Humid 2 A

GA Coweta Mixed-Humid 3 A

GA Crawford Mixed-Humid 3 A

GA Crisp Hot-Humid 3 A

GA Dade Mixed-Humid 4 A

GA Dawson Mixed-Humid 4 A

GA Decatur Hot-Humid 2 A

GA DeKalb Mixed-Humid 3 A

GA Dodge Hot-Humid 3 A

GA Dooly Hot-Humid 3 A

GA Dougherty Hot-Humid 3 A

GA Douglas Mixed-Humid 3 A

GA Early Hot-Humid 3 A

GA Echols Hot-Humid 2 A

GA Effingham Hot-Humid 2 A

GA Elbert Mixed-Humid 3 A

GA Emanuel Hot-Humid 3 A

GA Evans Hot-Humid 2 A

GA Fannin Mixed-Humid 4 A

GA Fayette Mixed-Humid 3 A

GA Floyd Mixed-Humid 4 A

GA Forsyth Mixed-Humid 3 A

GA Franklin Mixed-Humid 4 A

GA Fulton Mixed-Humid 3 A

GA Gilmer Mixed-Humid 4 A

GA Glascock Mixed-Humid 3 A

GA Glynn Hot-Humid 2 A

GA Gordon Mixed-Humid 4 A

GA Grady Hot-Humid 2 A

GA Greene Mixed-Humid 3 A

GA Gwinnett Mixed-Humid 3 A

GA Habersham Mixed-Humid 4 A

GA Hall Mixed-Humid 4 A

GA Hancock Mixed-Humid 3 A

GA Haralson Mixed-Humid 3 A

GA Harris Mixed-Humid 3 A

GA Hart Mixed-Humid 3 A

GA Heard Mixed-Humid 3 A

GA Henry Mixed-Humid 3 A

GA Houston Hot-Humid 3 A

10 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

GA Irwin Hot-Humid 3 A

GA Jackson Mixed-Humid 3 A

GA Jasper Mixed-Humid 3 A

GA Jeff Davis Hot-Humid 2 A

GA Jefferson Mixed-Humid 3 A

GA Jenkins Hot-Humid 3 A

GA Johnson Hot-Humid 3 A

GA Jones Mixed-Humid 3 A

GA Lamar Mixed-Humid 3 A

GA Lanier Hot-Humid 2 A

GA Laurens Hot-Humid 3 A

GA Lee Hot-Humid 3 A

GA Liberty Hot-Humid 2 A

GA Lincoln Mixed-Humid 3 A

GA Long Hot-Humid 2 A

GA Lowndes Hot-Humid 2 A

GA Lumpkin Mixed-Humid 4 A

GA Macon Hot-Humid 3 A

GA Madison Mixed-Humid 3 A

GA Marion Hot-Humid 3 A

GA McDuffie Mixed-Humid 3 A

GA McIntosh Hot-Humid 2 A

GA Meriwether Mixed-Humid 3 A

GA Miller Hot-Humid 2 A

GA Mitchell Hot-Humid 2 A

GA Monroe Mixed-Humid 3 A

GA Montgomery Hot-Humid 3 A

GA Morgan Mixed-Humid 3 A

GA Murray Mixed-Humid 4 A

GA Muscogee Mixed-Humid 3 A

GA Newton Mixed-Humid 3 A

GA Oconee Mixed-Humid 3 A

GA Oglethorpe Mixed-Humid 3 A

GA Paulding Mixed-Humid 3 A

GA Peach Hot-Humid 3 A

GA Pickens Mixed-Humid 4 A

GA Pierce Hot-Humid 2 A

GA Pike Mixed-Humid 3 A

GA Polk Mixed-Humid 3 A

GA Pulaski Hot-Humid 3 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

GA Putnam Mixed-Humid 3 A

GA Quitman Hot-Humid 3 A

GA Rabun Mixed-Humid 4 A

GA Randolph Hot-Humid 3 A

GA Richmond Mixed-Humid 3 A

GA Rockdale Mixed-Humid 3 A

GA Schley Hot-Humid 3 A

GA Screven Hot-Humid 3 A

GA Seminole Hot-Humid 2 A

GA Spalding Mixed-Humid 3 A

GA Stephens Mixed-Humid 4 A

GA Stewart Hot-Humid 3 A

GA Sumter Hot-Humid 3 A

GA Talbot Mixed-Humid 3 A

GA Taliaferro Mixed-Humid 3 A

GA Tattnall Hot-Humid 2 A

GA Taylor Hot-Humid 3 A

GA Telfair Hot-Humid 3 A

GA Terrell Hot-Humid 3 A

GA Thomas Hot-Humid 2 A

GA Tift Hot-Humid 3 A

GA Toombs Hot-Humid 2 A

GA Towns Mixed-Humid 4 A

GA Treutlen Hot-Humid 3 A

GA Troup Mixed-Humid 3 A

GA Turner Hot-Humid 3 A

GA Twiggs Hot-Humid 3 A

GA Union Mixed-Humid 4 A

GA Upson Mixed-Humid 3 A

GA Walker Mixed-Humid 4 A

GA Walton Mixed-Humid 3 A

GA Ware Hot-Humid 2 A

GA Warren Mixed-Humid 3 A

GA Washington Mixed-Humid 3 A

GA Wayne Hot-Humid 2 A

GA Webster Hot-Humid 3 A

GA Wheeler Hot-Humid 3 A

GA White Mixed-Humid 4 A

GA Whitfield Mixed-Humid 4 A

GA Wilcox Hot-Humid 3 A

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 11

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

GA Wilkes Mixed-Humid 3 A

GA Wilkinson Mixed-Humid 3 A

GA Worth Hot-Humid 3 A

HAWAII

HI Hawaii Hot-Humid 1 A

HI Honolulu Hot-Humid 1 A

HI Kalawao Hot-Humid 1 A

HI Kauai Hot-Humid 1 A

HI Maui Hot-Humid 1 A

IDAHO

ID Ada Cold 5 B

ID Adams Cold 6 B

ID Bannock Cold 6 B

ID Bear Lake Cold 6 B

ID Benewah Cold 5 B

ID Bingham Cold 6 B

ID Blaine Cold 6 B

ID Boise Cold 6 B

ID Bonner Cold 6 B

ID Bonneville Cold 6 B

ID Boundary Cold 6 B

ID Butte Cold 6 B

ID Camas Cold 6 B

ID Canyon Cold 5 B

ID Caribou Cold 6 B

ID Cassia Cold 5 B

ID Clark Cold 6 B

ID Clearwater Cold 5 B

ID Custer Cold 6 B

ID Elmore Cold 5 B

ID Franklin Cold 6 B

ID Fremont Cold 6 B

ID Gem Cold 5 B

ID Gooding Cold 5 B

ID Idaho Cold 5 B

ID Jefferson Cold 6 B

ID Jerome Cold 5 B

ID Kootenai Cold 5 B

ID Latah Cold 5 B

ID Lemhi Cold 6 B

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

ID Lewis Cold 5 B

ID Lincoln Cold 5 B

ID Madison Cold 6 B

ID Minidoka Cold 5 B

ID Nez Perce Cold 5 B

ID Oneida Cold 6 B

ID Owyhee Cold 5 B

ID Payette Cold 5 B

ID Power Cold 5 B

ID Shoshone Cold 5 B

ID Teton Cold 6 B

ID Twin Falls Cold 5 B

ID Valley Cold 6 B

ID Washington Cold 5 B

ILLINOIS

IL Adams Cold 5 A

IL Alexander Mixed-Humid 4 A

IL Bond Mixed-Humid 4 A

IL Boone Cold 5 A

IL Brown Cold 5 A

IL Bureau Cold 5 A

IL Calhoun Cold 5 A

IL Carroll Cold 5 A

IL Cass Cold 5 A

IL Champaign Cold 5 A

IL Christian Mixed-Humid 4 A

IL Clark Cold 5 A

IL Clay Mixed-Humid 4 A

IL Clinton Mixed-Humid 4 A

IL Coles Cold 5 A

IL Cook Cold 5 A

IL Crawford Mixed-Humid 4 A

IL Cumberland Cold 5 A

IL DeKalb Cold 5 A

IL DeWitt Cold 5 A

IL Douglas Cold 5 A

IL DuPage Cold 5 A

IL Edgar Cold 5 A

IL Edwards Mixed-Humid 4 A

IL Effingham Mixed-Humid 4 A

12 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

IL Fayette Mixed-Humid 4 A

IL Ford Cold 5 A

IL Franklin Mixed-Humid 4 A

IL Fulton Cold 5 A

IL Gallatin Mixed-Humid 4 A

IL Greene Cold 5 A

IL Grundy Cold 5 A

IL Hamilton Mixed-Humid 4 A

IL Hancock Cold 5 A

IL Hardin Mixed-Humid 4 A

IL Henderson Cold 5 A

IL Henry Cold 5 A

IL Iroquois Cold 5 A

IL Jackson Mixed-Humid 4 A

IL Jasper Mixed-Humid 4 A

IL Jefferson Mixed-Humid 4 A

IL Jersey Cold 5 A

IL Jo Daviess Cold 5 A

IL Johnson Mixed-Humid 4 A

IL Kane Cold 5 A

IL Kankakee Cold 5 A

IL Kendall Cold 5 A

IL Knox Cold 5 A

IL Lake Cold 5 A

IL LaSalle Cold 5 A

IL Lawrence Mixed-Humid 4 A

IL Lee Cold 5 A

IL Livingston Cold 5 A

IL Logan Cold 5 A

IL Macon Cold 5 A

IL Macoupin Mixed-Humid 4 A

IL Madison Mixed-Humid 4 A

IL Marion Mixed-Humid 4 A

IL Marshall Cold 5 A

IL Mason Cold 5 A

IL Massac Mixed-Humid 4 A

IL McDonough Cold 5 A

IL McHenry Cold 5 A

IL McLean Cold 5 A

IL Menard Cold 5 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

IL Mercer Cold 5 A

IL Monroe Mixed-Humid 4 A

IL Montgomery Mixed-Humid 4 A

IL Morgan Cold 5 A

IL Moultrie Cold 5 A

IL Ogle Cold 5 A

IL Peoria Cold 5 A

IL Perry Mixed-Humid 4 A

IL Piatt Cold 5 A

IL Pike Cold 5 A

IL Pope Mixed-Humid 4 A

IL Pulaski Mixed-Humid 4 A

IL Putnam Cold 5 A

IL Randolph Mixed-Humid 4 A

IL Richland Mixed-Humid 4 A

IL Rock Island Cold 5 A

IL Saline Mixed-Humid 4 A

IL Sangamon Cold 5 A

IL Schuyler Cold 5 A

IL Scott Cold 5 A

IL Shelby Mixed-Humid 4 A

IL St. Clair Mixed-Humid 4 A

IL Stark Cold 5 A

IL Stephenson Cold 5 A

IL Tazewell Cold 5 A

IL Union Mixed-Humid 4 A

IL Vermilion Cold 5 A

IL Wabash Mixed-Humid 4 A

IL Warren Cold 5 A

IL Washington Mixed-Humid 4 A

IL Wayne Mixed-Humid 4 A

IL White Mixed-Humid 4 A

IL Whiteside Cold 5 A

IL Will Cold 5 A

IL Williamson Mixed-Humid 4 A

IL Winnebago Cold 5 A

IL Woodford Cold 5 A

INDIANA

IN Adams Cold 5 A

IN Allen Cold 5 A

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 13

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

IN Bartholomew Cold 5 A

IN Benton Cold 5 A

IN Blackford Cold 5 A

IN Boone Cold 5 A

IN Brown Mixed-Humid 4 A

IN Carroll Cold 5 A

IN Cass Cold 5 A

IN Clark Mixed-Humid 4 A

IN Clay Cold 5 A

IN Clinton Cold 5 A

IN Crawford Mixed-Humid 4 A

IN Daviess Mixed-Humid 4 A

IN Dearborn Mixed-Humid 4 A

IN Decatur Cold 5 A

IN DeKalb Cold 5 A

IN Delaware Cold 5 A

IN Dubois Mixed-Humid 4 A

IN Elkhart Cold 5 A

IN Fayette Cold 5 A

IN Floyd Mixed-Humid 4 A

IN Fountain Cold 5 A

IN Franklin Cold 5 A

IN Fulton Cold 5 A

IN Gibson Mixed-Humid 4 A

IN Grant Cold 5 A

IN Greene Mixed-Humid 4 A

IN Hamilton Cold 5 A

IN Hancock Cold 5 A

IN Harrison Mixed-Humid 4 A

IN Hendricks Cold 5 A

IN Henry Cold 5 A

IN Howard Cold 5 A

IN Huntington Cold 5 A

IN Jackson Mixed-Humid 4 A

IN Jasper Cold 5 A

IN Jay Cold 5 A

IN Jefferson Mixed-Humid 4 A

IN Jennings Mixed-Humid 4 A

IN Johnson Cold 5 A

IN Knox Mixed-Humid 4 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

IN Kosciusko Cold 5 A

IN LaGrange Cold 5 A

IN Lake Cold 5 A

IN LaPorte Cold 5 A

IN Lawrence Mixed-Humid 4 A

IN Madison Cold 5 A

IN Marion Cold 5 A

IN Marshall Cold 5 A

IN Martin Mixed-Humid 4 A

IN Miami Cold 5 A

IN Monroe Mixed-Humid 4 A

IN Montgomery Cold 5 A

IN Morgan Cold 5 A

IN Newton Cold 5 A

IN Noble Cold 5 A

IN Ohio Mixed-Humid 4 A

IN Orange Mixed-Humid 4 A

IN Owen Cold 5 A

IN Parke Cold 5 A

IN Perry Mixed-Humid 4 A

IN Pike Mixed-Humid 4 A

IN Porter Cold 5 A

IN Posey Mixed-Humid 4 A

IN Pulaski Cold 5 A

IN Putnam Cold 5 A

IN Randolph Cold 5 A

IN Ripley Mixed-Humid 4 A

IN Rush Cold 5 A

IN Scott Mixed-Humid 4 A

IN Shelby Cold 5 A

IN Spencer Mixed-Humid 4 A

IN St. Joseph Cold 5 A

IN Starke Cold 5 A

IN Steuben Cold 5 A

IN Sullivan Mixed-Humid 4 A

IN Switzerland Mixed-Humid 4 A

IN Tippecanoe Cold 5 A

IN Tipton Cold 5 A

IN Union Cold 5 A

IN Vanderburgh Mixed-Humid 4 A

14 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

IN Vermillion Cold 5 A

IN Vigo Cold 5 A

IN Wabash Cold 5 A

IN Warren Cold 5 A

IN Warrick Mixed-Humid 4 A

IN Washington Mixed-Humid 4 A

IN Wayne Cold 5 A

IN Wells Cold 5 A

IN White Cold 5 A

IN Whitley Cold 5 A

IOWA

IA Adair Cold 5 A

IA Adams Cold 5 A

IA Allamakee Cold 6 A

IA Appanoose Cold 5 A

IA Audubon Cold 5 A

IA Benton Cold 5 A

IA Black Hawk Cold 6 A

IA Boone Cold 5 A

IA Bremer Cold 6 A

IA Buchanan Cold 6 A

IA Buena Vista Cold 6 A

IA Butler Cold 6 A

IA Calhoun Cold 6 A

IA Carroll Cold 5 A

IA Cass Cold 5 A

IA Cedar Cold 5 A

IA Cerro Gordo Cold 6 A

IA Cherokee Cold 6 A

IA Chickasaw Cold 6 A

IA Clarke Cold 5 A

IA Clay Cold 6 A

IA Clayton Cold 6 A

IA Clinton Cold 5 A

IA Crawford Cold 5 A

IA Dallas Cold 5 A

IA Davis Cold 5 A

IA Decatur Cold 5 A

IA Delaware Cold 6 A

IA Des Moines Cold 5 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

IA Dickinson Cold 6 A

IA Dubuque Cold 5 A

IA Emmet Cold 6 A

IA Fayette Cold 6 A

IA Floyd Cold 6 A

IA Franklin Cold 6 A

IA Fremont Cold 5 A

IA Greene Cold 5 A

IA Grundy Cold 6 A

IA Guthrie Cold 5 A

IA Hamilton Cold 6 A

IA Hancock Cold 6 A

IA Hardin Cold 6 A

IA Harrison Cold 5 A

IA Henry Cold 5 A

IA Howard Cold 6 A

IA Humboldt Cold 6 A

IA Ida Cold 6 A

IA Iowa Cold 5 A

IA Jackson Cold 5 A

IA Jasper Cold 5 A

IA Jefferson Cold 5 A

IA Johnson Cold 5 A

IA Jones Cold 5 A

IA Keokuk Cold 5 A

IA Kossuth Cold 6 A

IA Lee Cold 5 A

IA Linn Cold 5 A

IA Louisa Cold 5 A

IA Lucas Cold 5 A

IA Lyon Cold 6 A

IA Madison Cold 5 A

IA Mahaska Cold 5 A

IA Marion Cold 5 A

IA Marshall Cold 5 A

IA Mills Cold 5 A

IA Mitchell Cold 6 A

IA Monona Cold 5 A

IA Monroe Cold 5 A

IA Montgomery Cold 5 A

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 15

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

IA Muscatine Cold 5 A

IA O'Brien Cold 6 A

IA Osceola Cold 6 A

IA Page Cold 5 A

IA Palo Alto Cold 6 A

IA Plymouth Cold 6 A

IA Pocahontas Cold 6 A

IA Polk Cold 5 A

IA Pottawattamie Cold 5 A

IA Poweshiek Cold 5 A

IA Ringgold Cold 5 A

IA Sac Cold 6 A

IA Scott Cold 5 A

IA Shelby Cold 5 A

IA Sioux Cold 6 A

IA Story Cold 5 A

IA Tama Cold 5 A

IA Taylor Cold 5 A

IA Union Cold 5 A

IA Van Buren Cold 5 A

IA Wapello Cold 5 A

IA Warren Cold 5 A

IA Washington Cold 5 A

IA Wayne Cold 5 A

IA Webster Cold 6 A

IA Winnebago Cold 6 A

IA Winneshiek Cold 6 A

IA Woodbury Cold 5 A

IA Worth Cold 6 A

IA Wright Cold 6 A

KANSAS

KS Allen Mixed-Humid 4 A

KS Anderson Mixed-Humid 4 A

KS Atchison Mixed-Humid 4 A

KS Barber Mixed-Humid 4 A

KS Barton Mixed-Humid 4 A

KS Bourbon Mixed-Humid 4 A

KS Brown Mixed-Humid 4 A

KS Butler Mixed-Humid 4 A

KS Chase Mixed-Humid 4 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

KS Chautauqua Mixed-Humid 4 A

KS Cherokee Mixed-Humid 4 A

KS Cheyenne Cold 5 A

KS Clark Mixed-Humid 4 A

KS Clay Mixed-Humid 4 A

KS Cloud Cold 5 A

KS Coffey Mixed-Humid 4 A

KS Comanche Mixed-Humid 4 A

KS Cowley Mixed-Humid 4 A

KS Crawford Mixed-Humid 4 A

KS Decatur Cold 5 A

KS Dickinson Mixed-Humid 4 A

KS Doniphan Mixed-Humid 4 A

KS Douglas Mixed-Humid 4 A

KS Edwards Mixed-Humid 4 A

KS Elk Mixed-Humid 4 A

KS Ellis Cold 5 A

KS Ellsworth Mixed-Humid 4 A

KS Finney Mixed-Humid 4 A

KS Ford Mixed-Humid 4 A

KS Franklin Mixed-Humid 4 A

KS Geary Mixed-Humid 4 A

KS Gove Cold 5 A

KS Graham Cold 5 A

KS Grant Mixed-Humid 4 A

KS Gray Mixed-Humid 4 A

KS Greeley Cold 5 A

KS Greenwood Mixed-Humid 4 A

KS Hamilton Cold 5 A

KS Harper Mixed-Humid 4 A

KS Harvey Mixed-Humid 4 A

KS Haskell Mixed-Humid 4 A

KS Hodgeman Mixed-Humid 4 A

KS Jackson Mixed-Humid 4 A

KS Jefferson Mixed-Humid 4 A

KS Jewell Cold 5 A

KS Johnson Mixed-Humid 4 A

KS Kearny Mixed-Humid 4 A

KS Kingman Mixed-Humid 4 A

KS Kiowa Mixed-Humid 4 A

16 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

KS Labette Mixed-Humid 4 A

KS Lane Cold 5 A

KS Leavenworth Mixed-Humid 4 A

KS Lincoln Mixed-Humid 4 A

KS Linn Mixed-Humid 4 A

KS Logan Cold 5 A

KS Lyon Mixed-Humid 4 A

KS Marion Mixed-Humid 4 A

KS Marshall Mixed-Humid 4 A

KS McPherson Mixed-Humid 4 A

KS Meade Mixed-Humid 4 A

KS Miami Mixed-Humid 4 A

KS Mitchell Cold 5 A

KS Montgomery Mixed-Humid 4 A

KS Morris Mixed-Humid 4 A

KS Morton Mixed-Humid 4 A

KS Nemaha Mixed-Humid 4 A

KS Neosho Mixed-Humid 4 A

KS Ness Cold 5 A

KS Norton Cold 5 A

KS Osage Mixed-Humid 4 A

KS Osborne Cold 5 A

KS Ottawa Mixed-Humid 4 A

KS Pawnee Mixed-Humid 4 A

KS Phillips Cold 5 A

KS Pottawatomie Mixed-Humid 4 A

KS Pratt Mixed-Humid 4 A

KS Rawlins Cold 5 A

KS Reno Mixed-Humid 4 A

KS Republic Cold 5 A

KS Rice Mixed-Humid 4 A

KS Riley Mixed-Humid 4 A

KS Rooks Cold 5 A

KS Rush Mixed-Humid 4 A

KS Russell Mixed-Humid 4 A

KS Saline Mixed-Humid 4 A

KS Scott Cold 5 A

KS Sedgwick Mixed-Humid 4 A

KS Seward Mixed-Humid 4 A

KS Shawnee Mixed-Humid 4 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

KS Sheridan Cold 5 A

KS Sherman Cold 5 A

KS Smith Cold 5 A

KS Stafford Mixed-Humid 4 A

KS Stanton Mixed-Humid 4 A

KS Stevens Mixed-Humid 4 A

KS Sumner Mixed-Humid 4 A

KS Thomas Cold 5 A

KS Trego Cold 5 A

KS Wabaunsee Mixed-Humid 4 A

KS Wallace Cold 5 A

KS Washington Mixed-Humid 4 A

KS Wichita Cold 5 A

KS Wilson Mixed-Humid 4 A

KS Woodson Mixed-Humid 4 A

KS Wyandotte Mixed-Humid 4 A

KENTUCKY

KY Adair Mixed-Humid 4 A

KY Allen Mixed-Humid 4 A

KY Anderson Mixed-Humid 4 A

KY Ballard Mixed-Humid 4 A

KY Barren Mixed-Humid 4 A

KY Bath Mixed-Humid 4 A

KY Bell Mixed-Humid 4 A

KY Boone Mixed-Humid 4 A

KY Bourbon Mixed-Humid 4 A

KY Boyd Mixed-Humid 4 A

KY Boyle Mixed-Humid 4 A

KY Bracken Mixed-Humid 4 A

KY Breathitt Mixed-Humid 4 A

KY Breckinridge Mixed-Humid 4 A

KY Bullitt Mixed-Humid 4 A

KY Butler Mixed-Humid 4 A

KY Caldwell Mixed-Humid 4 A

KY Calloway Mixed-Humid 4 A

KY Campbell Mixed-Humid 4 A

KY Carlisle Mixed-Humid 4 A

KY Carroll Mixed-Humid 4 A

KY Carter Mixed-Humid 4 A

KY Casey Mixed-Humid 4 A

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 17

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

KY Christian Mixed-Humid 4 A

KY Clark Mixed-Humid 4 A

KY Clay Mixed-Humid 4 A

KY Clinton Mixed-Humid 4 A

KY Crittenden Mixed-Humid 4 A

KY Cumberland Mixed-Humid 4 A

KY Daviess Mixed-Humid 4 A

KY Edmonson Mixed-Humid 4 A

KY Elliott Mixed-Humid 4 A

KY Estill Mixed-Humid 4 A

KY Fayette Mixed-Humid 4 A

KY Fleming Mixed-Humid 4 A

KY Floyd Mixed-Humid 4 A

KY Franklin Mixed-Humid 4 A

KY Fulton Mixed-Humid 4 A

KY Gallatin Mixed-Humid 4 A

KY Garrard Mixed-Humid 4 A

KY Grant Mixed-Humid 4 A

KY Graves Mixed-Humid 4 A

KY Grayson Mixed-Humid 4 A

KY Green Mixed-Humid 4 A

KY Greenup Mixed-Humid 4 A

KY Hancock Mixed-Humid 4 A

KY Hardin Mixed-Humid 4 A

KY Harlan Mixed-Humid 4 A

KY Harrison Mixed-Humid 4 A

KY Hart Mixed-Humid 4 A

KY Henderson Mixed-Humid 4 A

KY Henry Mixed-Humid 4 A

KY Hickman Mixed-Humid 4 A

KY Hopkins Mixed-Humid 4 A

KY Jackson Mixed-Humid 4 A

KY Jefferson Mixed-Humid 4 A

KY Jessamine Mixed-Humid 4 A

KY Johnson Mixed-Humid 4 A

KY Kenton Mixed-Humid 4 A

KY Knott Mixed-Humid 4 A

KY Knox Mixed-Humid 4 A

KY Larue Mixed-Humid 4 A

KY Laurel Mixed-Humid 4 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

KY Lawrence Mixed-Humid 4 A

KY Lee Mixed-Humid 4 A

KY Leslie Mixed-Humid 4 A

KY Letcher Mixed-Humid 4 A

KY Lewis Mixed-Humid 4 A

KY Lincoln Mixed-Humid 4 A

KY Livingston Mixed-Humid 4 A

KY Logan Mixed-Humid 4 A

KY Lyon Mixed-Humid 4 A

KY Madison Mixed-Humid 4 A

KY Magoffin Mixed-Humid 4 A

KY Marion Mixed-Humid 4 A

KY Marshall Mixed-Humid 4 A

KY Martin Mixed-Humid 4 A

KY Mason Mixed-Humid 4 A

KY McCracken Mixed-Humid 4 A

KY McCreary Mixed-Humid 4 A

KY McLean Mixed-Humid 4 A

KY Meade Mixed-Humid 4 A

KY Menifee Mixed-Humid 4 A

KY Mercer Mixed-Humid 4 A

KY Metcalfe Mixed-Humid 4 A

KY Monroe Mixed-Humid 4 A

KY Montgomery Mixed-Humid 4 A

KY Morgan Mixed-Humid 4 A

KY Muhlenberg Mixed-Humid 4 A

KY Nelson Mixed-Humid 4 A

KY Nicholas Mixed-Humid 4 A

KY Ohio Mixed-Humid 4 A

KY Oldham Mixed-Humid 4 A

KY Owen Mixed-Humid 4 A

KY Owsley Mixed-Humid 4 A

KY Pendleton Mixed-Humid 4 A

KY Perry Mixed-Humid 4 A

KY Pike Mixed-Humid 4 A

KY Powell Mixed-Humid 4 A

KY Pulaski Mixed-Humid 4 A

KY Robertson Mixed-Humid 4 A

KY Rockcastle Mixed-Humid 4 A

KY Rowan Mixed-Humid 4 A

18 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

KY Russell Mixed-Humid 4 A

KY Scott Mixed-Humid 4 A

KY Shelby Mixed-Humid 4 A

KY Simpson Mixed-Humid 4 A

KY Spencer Mixed-Humid 4 A

KY Taylor Mixed-Humid 4 A

KY Todd Mixed-Humid 4 A

KY Trigg Mixed-Humid 4 A

KY Trimble Mixed-Humid 4 A

KY Union Mixed-Humid 4 A

KY Warren Mixed-Humid 4 A

KY Washington Mixed-Humid 4 A

KY Wayne Mixed-Humid 4 A

KY Webster Mixed-Humid 4 A

KY Whitley Mixed-Humid 4 A

KY Wolfe Mixed-Humid 4 A

KY Woodford Mixed-Humid 4 A

LOUISIANA

LA Acadia Hot-Humid 2 A

LA Allen Hot-Humid 2 A

LA Ascension Hot-Humid 2 A

LA Assumption Hot-Humid 2 A

LA Avoyelles Hot-Humid 2 A

LA Beauregard Hot-Humid 2 A

LA Bienville Hot-Humid 3 A

LA Bossier Hot-Humid 3 A

LA Caddo Hot-Humid 3 A

LA Calcasieu Hot-Humid 2 A

LA Caldwell Hot-Humid 3 A

LA Cameron Hot-Humid 2 A

LA Catahoula Hot-Humid 3 A

LA Claiborne Hot-Humid 3 A

LA Concordia Hot-Humid 3 A

LA De Soto Hot-Humid 3 A

LA East Baton Rouge Hot-Humid 2 A

LA East Carroll Mixed-Humid 3 A

LA East Feliciana Hot-Humid 2 A

LA Evangeline Hot-Humid 2 A

LA Franklin Hot-Humid 3 A

LA Grant Hot-Humid 3 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

LA Iberia Hot-Humid 2 A

LA Iberville Hot-Humid 2 A

LA Jackson Hot-Humid 3 A

LA Jefferson Hot-Humid 2 A

LA Jefferson Davis Hot-Humid 2 A

LA La Salle Hot-Humid 3 A

LA Lafayette Hot-Humid 2 A

LA Lafourche Hot-Humid 2 A

LA Lincoln Hot-Humid 3 A

LA Livingston Hot-Humid 2 A

LA Madison Hot-Humid 3 A

LA Morehouse Mixed-Humid 3 A

LA Natchitoches Hot-Humid 3 A

LA Orleans Hot-Humid 2 A

LA Ouachita Hot-Humid 3 A

LA Plaquemines Hot-Humid 2 A

LA Pointe Coupee Hot-Humid 2 A

LA Rapides Hot-Humid 2 A

LA Red River Hot-Humid 3 A

LA Richland Hot-Humid 3 A

LA Sabine Hot-Humid 3 A

LA St. Bernard Hot-Humid 2 A

LA St. Charles Hot-Humid 2 A

LA St. Helena Hot-Humid 2 A

LA St. James Hot-Humid 2 A

LA St. John the 

Baptist

Hot-Humid 2 A

LA St. LanB Hot-Humid 2 A

LA St. Martin Hot-Humid 2 A

LA St. Mary Hot-Humid 2 A

LA St. Tammany Hot-Humid 2 A

LA Tangipahoa Hot-Humid 2 A

LA Tensas Hot-Humid 3 A

LA Terrebonne Hot-Humid 2 A

LA Union Hot-Humid 3 A

LA Vermilion Hot-Humid 2 A

LA Vernon Hot-Humid 3 A

LA Washington Hot-Humid 2 A

LA Webster Hot-Humid 3 A

LA West Baton Rouge Hot-Humid 2 A

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 19

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

LA West Carroll Mixed-Humid 3 A

LA West Feliciana Hot-Humid 2 A

LA Winn Hot-Humid 3 A

MAINE

ME Androscoggin Cold 6 A

ME Aroostook Very Cold 7

ME Cumberland Cold 6 A

ME Franklin Cold 6 A

ME Hancock Cold 6 A

ME Kennebec Cold 6 A

ME Knox Cold 6 A

ME Lincoln Cold 6 A

ME Oxford Cold 6 A

ME Penobscot Cold 6 A

ME Piscataquis Cold 6 A

ME Sagadahoc Cold 6 A

ME Somerset Cold 6 A

ME Waldo Cold 6 A

ME Washington Cold 6 A

ME York Cold 6 A

MARYLAND

MD Allegany Mixed-Humid 4 A

MD Anne Arundel Mixed-Humid 4 A

MD Baltimore Mixed-Humid 4 A

MD Baltimore (city) Mixed-Humid 4 A

MD Calvert Mixed-Humid 4 A

MD Caroline Mixed-Humid 4 A

MD Carroll Mixed-Humid 4 A

MD Cecil Mixed-Humid 4 A

MD Charles Mixed-Humid 4 A

MD Dorchester Mixed-Humid 4 A

MD Frederick Mixed-Humid 4 A

MD Garrett Cold 5 A

MD Harford Mixed-Humid 4 A

MD Howard Mixed-Humid 4 A

MD Kent Mixed-Humid 4 A

MD Montgomery Mixed-Humid 4 A

MD Prince George's Mixed-Humid 4 A

MD Queen Anne's Mixed-Humid 4 A

MD Somerset Mixed-Humid 4 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

MD St. Mary's Mixed-Humid 4 A

MD Talbot Mixed-Humid 4 A

MD Washington Mixed-Humid 4 A

MD Wicomico Mixed-Humid 4 A

MD Worcester Mixed-Humid 4 A

MASSACHUSETTS

MA Barnstable Cold 5 A

MA Berkshire Cold 5 A

MA Bristol Cold 5 A

MA Dukes Cold 5 A

MA Essex Cold 5 A

MA Franklin Cold 5 A

MA Hampden Cold 5 A

MA Hampshire Cold 5 A

MA Middlesex Cold 5 A

MA Nantucket Cold 5 A

MA Norfolk Cold 5 A

MA Plymouth Cold 5 A

MA Suffolk Cold 5 A

MA Worcester Cold 5 A

MICHIGAN

MI Alcona Cold 6 A

MI Alger Cold 6 A

MI Allegan Cold 5 A

MI Alpena Cold 6 A

MI Antrim Cold 6 A

MI Arenac Cold 6 A

MI Baraga Very Cold 7 A

MI Barry Cold 5 A

MI Bay Cold 5 A

MI Benzie Cold 6 A

MI Berrien Cold 5 A

MI Branch Cold 5 A

MI Calhoun Cold 5 A

MI Cass Cold 5 A

MI Charlevoix Cold 6 A

MI Cheboygan Cold 6 A

MI Chippewa Very Cold 7 A

MI Clare Cold 6 A

MI Clinton Cold 5 A

20 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

MI Crawford Cold 6 A

MI Delta Cold 6 A

MI Dickinson Cold 6 A

MI Eaton Cold 5 A

MI Emmet Cold 6 A

MI Genesee Cold 5 A

MI Gladwin Cold 6 A

MI Gogebic Very Cold 7 A

MI Grand Traverse Cold 6 A

MI Gratiot Cold 5 A

MI Hillsdale Cold 5 A

MI Houghton Very Cold 7 A

MI Huron Cold 6 A

MI Ingham Cold 5 A

MI Ionia Cold 5 A

MI Iosco Cold 6 A

MI Iron Very Cold 7 A

MI Isabella Cold 6 A

MI Jackson Cold 5 A

MI Kalamazoo Cold 5 A

MI Kalkaska Cold 6 A

MI Kent Cold 5 A

MI Keweenaw Very Cold 7 A

MI Lake Cold 6 A

MI Lapeer Cold 5 A

MI Leelanau Cold 6 A

MI Lenawee Cold 5 A

MI Livingston Cold 5 A

MI Luce Very Cold 7 A

MI Mackinac Very Cold 7 A

MI Macomb Cold 5 A

MI Manistee Cold 6 A

MI Marquette Cold 6 A

MI Mason Cold 6 A

MI Mecosta Cold 6 A

MI Menominee Cold 6 A

MI Midland Cold 5 A

MI Missaukee Cold 6 A

MI Monroe Cold 5 A

MI Montcalm Cold 5 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

MI Montmorency Cold 6 A

MI Muskegon Cold 5 A

MI Newaygo Cold 6 A

MI Oakland Cold 5 A

MI Oceana Cold 6 A

MI Ogemaw Cold 6 A

MI Ontonagon Very Cold 7 A

MI Osceola Cold 6 A

MI Oscoda Cold 6 A

MI Otsego Cold 6 A

MI Ottawa Cold 5 A

MI Presque Isle Cold 6 A

MI Roscommon Cold 6 A

MI Saginaw Cold 5 A

MI Sanilac Cold 6 A

MI Schoolcraft Very Cold 7 A

MI Shiawassee Cold 5 A

MI St. Clair Cold 5 A

MI St. Joseph Cold 5 A

MI Tuscola Cold 5 A

MI Van Buren Cold 5 A

MI Washtenaw Cold 5 A

MI Wayne Cold 5 A

MI Wexford Cold 6 A

MINNESOTA

MN Aitkin Very Cold 7 A

MN Anoka Cold 6 A

MN Becker Very Cold 7 A

MN Beltrami Very Cold 7 A

MN Benton Cold 6 A

MN Big Stone Cold 6 A

MN Blue Earth Cold 6 A

MN Brown Cold 6 A

MN Carlton Very Cold 7 A

MN Carver Cold 6 A

MN Cass Very Cold 7 A

MN Chippewa Cold 6 A

MN Chisago Cold 6 A

MN Clay Very Cold 7 A

MN Clearwater Very Cold 7 A

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 21

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

MN Cook Very Cold 7 A

MN Cottonwood Cold 6 A

MN Crow Wing Very Cold 7 A

MN Dakota Cold 6 A

MN Dodge Cold 6 A

MN Douglas Cold 6 A

MN Faribault Cold 6 A

MN Fillmore Cold 6 A

MN Freeborn Cold 6 A

MN Goodhue Cold 6 A

MN Grant Very Cold 7 A

MN Hennepin Cold 6 A

MN Houston Cold 6 A

MN Hubbard Very Cold 7 A

MN Isanti Cold 6 A

MN Itasca Very Cold 7 A

MN Jackson Cold 6 A

MN Kanabec Very Cold 7 A

MN Kandiyohi Cold 6 A

MN Kittson Very Cold 7 A

MN Koochiching Very Cold 7 A

MN Lac qui Parle Cold 6 A

MN Lake Very Cold 7 A

MN Lake of the Woods Very Cold 7 A

MN Le Sueur Cold 6 A

MN Lincoln Cold 6 A

MN Lyon Cold 6 A

MN Mahnomen Very Cold 7 A

MN Marshall Very Cold 7 A

MN Martin Cold 6 A

MN McLeod Cold 6 A

MN Meeker Cold 6 A

MN Mille Lacs Very Cold 7 A

MN Morrison Cold 6 A

MN Mower Cold 6 A

MN Murray Cold 6 A

MN Nicollet Cold 6 A

MN Nobles Cold 6 A

MN Norman Very Cold 7 A

MN Olmsted Cold 6 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

MN Otter Tail Very Cold 7 A

MN Pennington Very Cold 7 A

MN Pine Very Cold 7 A

MN Pipestone Cold 6 A

MN Polk Very Cold 7 A

MN Pope Cold 6 A

MN Ramsey Cold 6 A

MN Red Lake Very Cold 7 A

MN Redwood Cold 6 A

MN Renville Cold 6 A

MN Rice Cold 6 A

MN Rock Cold 6 A

MN Roseau Very Cold 7 A

MN Scott Cold 6 A

MN Sherburne Cold 6 A

MN Sibley Cold 6 A

MN St. Louis Very Cold 7 A

MN Stearns Cold 6 A

MN Steele Cold 6 A

MN Stevens Cold 6 A

MN Swift Cold 6 A

MN Todd Cold 6 A

MN Traverse Cold 6 A

MN Wabasha Cold 6 A

MN Wadena Very Cold 7 A

MN Waseca Cold 6 A

MN Washington Cold 6 A

MN Watonwan Cold 6 A

MN Wilkin Very Cold 7 A

MN Winona Cold 6 A

MN Wright Cold 6 A

MN Yellow Medicine Cold 6 A

MISSISSIPPI

MS Adams Hot-Humid 3 A

MS Alcorn Mixed-Humid 3 A

MS Amite Hot-Humid 3 A

MS Attala Mixed-Humid 3 A

MS Benton Mixed-Humid 3 A

MS Bolivar Mixed-Humid 3 A

MS Calhoun Mixed-Humid 3 A

22 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

MS Carroll Mixed-Humid 3 A

MS Chickasaw Mixed-Humid 3 A

MS Choctaw Mixed-Humid 3 A

MS Claiborne Hot-Humid 3 A

MS Clarke Mixed-Humid 3 A

MS Clay Mixed-Humid 3 A

MS Coahoma Mixed-Humid 3 A

MS Copiah Hot-Humid 3 A

MS Covington Hot-Humid 3 A

MS DeSoto Mixed-Humid 3 A

MS Forrest Hot-Humid 3 A

MS Franklin Hot-Humid 3 A

MS George Hot-Humid 3 A

MS Greene Hot-Humid 3 A

MS Grenada Mixed-Humid 3 A

MS Hancock Hot-Humid 2 A

MS Harrison Hot-Humid 2 A

MS Hinds Hot-Humid 3 A

MS Holmes Mixed-Humid 3 A

MS Humphreys Mixed-Humid 3 A

MS Issaquena Mixed-Humid 3 A

MS Itawamba Mixed-Humid 3 A

MS Jackson Hot-Humid 2 A

MS Jasper Mixed-Humid 3 A

MS Jefferson Hot-Humid 3 A

MS Jefferson Davis Hot-Humid 3 A

MS Jones Hot-Humid 3 A

MS Kemper Mixed-Humid 3 A

MS Lafayette Mixed-Humid 3 A

MS Lamar Hot-Humid 3 A

MS Lauderdale Mixed-Humid 3 A

MS Lawrence Hot-Humid 3 A

MS Leake Mixed-Humid 3 A

MS Lee Mixed-Humid 3 A

MS Leflore Mixed-Humid 3 A

MS Lincoln Hot-Humid 3 A

MS Lowndes Mixed-Humid 3 A

MS Madison Mixed-Humid 3 A

MS Marion Hot-Humid 3 A

MS Marshall Mixed-Humid 3 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

MS Monroe Mixed-Humid 3 A

MS Montgomery Mixed-Humid 3 A

MS Neshoba Mixed-Humid 3 A

MS Newton Mixed-Humid 3 A

MS Noxubee Mixed-Humid 3 A

MS Oktibbeha Mixed-Humid 3 A

MS Panola Mixed-Humid 3 A

MS Pearl River Hot-Humid 2 A

MS Perry Hot-Humid 3 A

MS Pike Hot-Humid 3 A

MS Pontotoc Mixed-Humid 3 A

MS Prentiss Mixed-Humid 3 A

MS Quitman Mixed-Humid 3 A

MS Rankin Hot-Humid 3 A

MS Scott Mixed-Humid 3 A

MS Sharkey Mixed-Humid 3 A

MS Simpson Hot-Humid 3 A

MS Smith Hot-Humid 3 A

MS Stone Hot-Humid 2 A

MS Sunflower Mixed-Humid 3 A

MS Tallahatchie Mixed-Humid 3 A

MS Tate Mixed-Humid 3 A

MS Tippah Mixed-Humid 3 A

MS Tishomingo Mixed-Humid 3 A

MS Tunica Mixed-Humid 3 A

MS Union Mixed-Humid 3 A

MS Walthall Hot-Humid 3 A

MS Warren Hot-Humid 3 A

MS Washington Mixed-Humid 3 A

MS Wayne Hot-Humid 3 A

MS Webster Mixed-Humid 3 A

MS Wilkinson Hot-Humid 3 A

MS Winston Mixed-Humid 3 A

MS Yalobusha Mixed-Humid 3 A

MS Yazoo Mixed-Humid 3 A

MISSOURI

MO Adair Cold 5 A

MO Andrew Cold 5 A

MO Atchison Cold 5 A

MO Audrain Mixed-Humid 4 A

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 23

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

MO Barry Mixed-Humid 4 A

MO Barton Mixed-Humid 4 A

MO Bates Mixed-Humid 4 A

MO Benton Mixed-Humid 4 A

MO Bollinger Mixed-Humid 4 A

MO Boone Mixed-Humid 4 A

MO Buchanan Cold 5 A

MO Butler Mixed-Humid 4 A

MO Caldwell Cold 5 A

MO Callaway Mixed-Humid 4 A

MO Camden Mixed-Humid 4 A

MO Cape Girardeau Mixed-Humid 4 A

MO Carroll Mixed-Humid 4 A

MO Carter Mixed-Humid 4 A

MO Cass Mixed-Humid 4 A

MO Cedar Mixed-Humid 4 A

MO Chariton Cold 5 A

MO Christian Mixed-Humid 4 A

MO Clark Cold 5 A

MO Clay Mixed-Humid 4 A

MO Clinton Cold 5 A

MO Cole Mixed-Humid 4 A

MO Cooper Mixed-Humid 4 A

MO Crawford Mixed-Humid 4 A

MO Dade Mixed-Humid 4 A

MO Dallas Mixed-Humid 4 A

MO Daviess Cold 5 A

MO DeKalb Cold 5 A

MO Dent Mixed-Humid 4 A

MO Douglas Mixed-Humid 4 A

MO Dunklin Mixed-Humid 4 A

MO Franklin Mixed-Humid 4 A

MO Gasconade Mixed-Humid 4 A

MO Gentry Cold 5 A

MO Greene Mixed-Humid 4 A

MO Grundy Cold 5 A

MO Harrison Cold 5 A

MO Henry Mixed-Humid 4 A

MO Hickory Mixed-Humid 4 A

MO Holt Cold 5 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

MO Howard Mixed-Humid 4 A

MO Howell Mixed-Humid 4 A

MO Iron Mixed-Humid 4 A

MO Jackson Mixed-Humid 4 A

MO Jasper Mixed-Humid 4 A

MO Jefferson Mixed-Humid 4 A

MO Johnson Mixed-Humid 4 A

MO Knox Cold 5 A

MO Laclede Mixed-Humid 4 A

MO Lafayette Mixed-Humid 4 A

MO Lawrence Mixed-Humid 4 A

MO Lewis Cold 5 A

MO Lincoln Mixed-Humid 4 A

MO Linn Cold 5 A

MO Livingston Cold 5 A

MO Macon Cold 5 A

MO Madison Mixed-Humid 4 A

MO Maries Mixed-Humid 4 A

MO Marion Cold 5 A

MO McDonald Mixed-Humid 4 A

MO Mercer Cold 5 A

MO Miller Mixed-Humid 4 A

MO Mississippi Mixed-Humid 4 A

MO Moniteau Mixed-Humid 4 A

MO Monroe Mixed-Humid 4 A

MO Montgomery Mixed-Humid 4 A

MO Morgan Mixed-Humid 4 A

MO New Madrid Mixed-Humid 4 A

MO Newton Mixed-Humid 4 A

MO Nodaway Cold 5 A

MO Oregon Mixed-Humid 4 A

MO Osage Mixed-Humid 4 A

MO Ozark Mixed-Humid 4 A

MO Pemiscot Mixed-Humid 4 A

MO Perry Mixed-Humid 4 A

MO Pettis Mixed-Humid 4 A

MO Phelps Mixed-Humid 4 A

MO Pike Cold 5 A

MO Platte Mixed-Humid 4 A

MO Polk Mixed-Humid 4 A

24 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

MO Pulaski Mixed-Humid 4 A

MO Putnam Cold 5 A

MO Ralls Cold 5 A

MO Randolph Mixed-Humid 4 A

MO Ray Mixed-Humid 4 A

MO Reynolds Mixed-Humid 4 A

MO Ripley Mixed-Humid 4 A

MO Saline Mixed-Humid 4 A

MO Schuyler Cold 5 A

MO Scotland Cold 5 A

MO Scott Mixed-Humid 4 A

MO Shannon Mixed-Humid 4 A

MO Shelby Cold 5 A

MO St. Charles Mixed-Humid 4 A

MO St. Clair Mixed-Humid 4 A

MO St. Francois Mixed-Humid 4 A

MO St. Louis Mixed-Humid 4 A

MO St. Louis (city) Mixed-Humid 4 A

MO Ste. Genevieve Mixed-Humid 4 A

MO Stoddard Mixed-Humid 4 A

MO Stone Mixed-Humid 4 A

MO Sullivan Cold 5 A

MO Taney Mixed-Humid 4 A

MO Texas Mixed-Humid 4 A

MO Vernon Mixed-Humid 4 A

MO Warren Mixed-Humid 4 A

MO Washington Mixed-Humid 4 A

MO Wayne Mixed-Humid 4 A

MO Webster Mixed-Humid 4 A

MO Worth Cold 5 A

MO Wright Mixed-Humid 4 A

MONTANA

MT Beaverhead Cold 6 B

MT Big Horn Cold 6 B

MT Blaine Cold 6 B

MT Broadwater Cold 6 B

MT Carbon Cold 6 B

MT Carter Cold 6 B

MT Cascade Cold 6 B

MT Chouteau Cold 6 B

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

MT Custer Cold 6 B

MT Daniels Cold 6 B

MT Dawson Cold 6 B

MT Deer Lodge Cold 6 B

MT Fallon Cold 6 B

MT Fergus Cold 6 B

MT Flathead Cold 6 B

MT Gallatin Cold 6 B

MT Garfield Cold 6 B

MT Glacier Cold 6 B

MT Golden Valley Cold 6 B

MT Granite Cold 6 B

MT Hill Cold 6 B

MT Jefferson Cold 6 B

MT Judith Basin Cold 6 B

MT Lake Cold 6 B

MT Lewis and Clark Cold 6 B

MT Liberty Cold 6 B

MT Lincoln Cold 6 B

MT Madison Cold 6 B

MT McCone Cold 6 B

MT Meagher Cold 6 B

MT Mineral Cold 6 B

MT Missoula Cold 6 B

MT Musselshell Cold 6 B

MT Park Cold 6 B

MT Petroleum Cold 6 B

MT Phillips Cold 6 B

MT Pondera Cold 6 B

MT Powder River Cold 6 B

MT Powell Cold 6 B

MT Prairie Cold 6 B

MT Ravalli Cold 6 B

MT Richland Cold 6 B

MT Roosevelt Cold 6 B

MT Rosebud Cold 6 B

MT Sanders Cold 6 B

MT Sheridan Cold 6 B

MT Silver Bow Cold 6 B

MT Stillwater Cold 6 B

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 25

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

MT Sweet Grass Cold 6 B

MT Teton Cold 6 B

MT Toole Cold 6 B

MT Treasure Cold 6 B

MT Valley Cold 6 B

MT Wheatland Cold 6 B

MT Wibaux Cold 6 B

MT Yellowstone Cold 6 B

NEBRASKA

NE Adams Cold 5 A

NE Antelope Cold 5 A

NE Arthur Cold 5 A

NE Banner Cold 5 A

NE Blaine Cold 5 A

NE Boone Cold 5 A

NE Box Butte Cold 5 A

NE Boyd Cold 5 A

NE Brown Cold 5 A

NE Buffalo Cold 5 A

NE Burt Cold 5 A

NE Butler Cold 5 A

NE Cass Cold 5 A

NE Cedar Cold 5 A

NE Chase Cold 5 A

NE Cherry Cold 5 A

NE Cheyenne Cold 5 A

NE Clay Cold 5 A

NE Colfax Cold 5 A

NE Cuming Cold 5 A

NE Custer Cold 5 A

NE Dakota Cold 5 A

NE Dawes Cold 5 A

NE Dawson Cold 5 A

NE Deuel Cold 5 A

NE Dixon Cold 5 A

NE Dodge Cold 5 A

NE Douglas Cold 5 A

NE Dundy Cold 5 A

NE Fillmore Cold 5 A

NE Franklin Cold 5 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

NE Frontier Cold 5 A

NE Furnas Cold 5 A

NE Gage Cold 5 A

NE Garden Cold 5 A

NE Garfield Cold 5 A

NE Gosper Cold 5 A

NE Grant Cold 5 A

NE Greeley Cold 5 A

NE Hall Cold 5 A

NE Hamilton Cold 5 A

NE Harlan Cold 5 A

NE Hayes Cold 5 A

NE Hitchcock Cold 5 A

NE Holt Cold 5 A

NE Hooker Cold 5 A

NE Howard Cold 5 A

NE Jefferson Cold 5 A

NE Johnson Cold 5 A

NE Kearney Cold 5 A

NE Keith Cold 5 A

NE Keya Paha Cold 5 A

NE Kimball Cold 5 A

NE Knox Cold 5 A

NE Lancaster Cold 5 A

NE Lincoln Cold 5 A

NE Logan Cold 5 A

NE Loup Cold 5 A

NE Madison Cold 5 A

NE McPherson Cold 5 A

NE Merrick Cold 5 A

NE Morrill Cold 5 A

NE Nance Cold 5 A

NE Nemaha Cold 5 A

NE Nuckolls Cold 5 A

NE Otoe Cold 5 A

NE Pawnee Cold 5 A

NE Perkins Cold 5 A

NE Phelps Cold 5 A

NE Pierce Cold 5 A

NE Platte Cold 5 A

26 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

NE Polk Cold 5 A

NE Red Willow Cold 5 A

NE Richardson Cold 5 A

NE Rock Cold 5 A

NE Saline Cold 5 A

NE Sarpy Cold 5 A

NE Saunders Cold 5 A

NE Scotts Bluff Cold 5 A

NE Seward Cold 5 A

NE Sheridan Cold 5 A

NE Sherman Cold 5 A

NE Sioux Cold 5 A

NE Stanton Cold 5 A

NE Thayer Cold 5 A

NE Thomas Cold 5 A

NE Thurston Cold 5 A

NE Valley Cold 5 A

NE Washington Cold 5 A

NE Wayne Cold 5 A

NE Webster Cold 5 A

NE Wheeler Cold 5 A

NE York Cold 5 A

NEVADA

NV Carson City (city) Cold 5 B

NV Churchill Cold 5 B

NV Clark Hot-Dry 3 B

NV Douglas Cold 5 B

NV Elko Cold 5 B

NV Esmeralda Cold 5 B

NV Eureka Cold 5 B

NV Humboldt Cold 5 B

NV Lander Cold 5 B

NV Lincoln Cold 5 B

NV Lyon Cold 5 B

NV Mineral Cold 5 B

NV Nye Cold 5 B

NV Pershing Cold 5 B

NV Storey Cold 5 B

NV Washoe Cold 5 B

NV White Pine Cold 5 B

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

NEW HAMPSHIRE

NH Belknap Cold 6 A

NH Carroll Cold 6 A

NH Cheshire Cold 5 A

NH Coos Cold 6 A

NH Grafton Cold 6 A

NH Hillsborough Cold 5 A

NH Merrimack Cold 6 A

NH Rockingham Cold 5 A

NH Strafford Cold 5 A

NH Sullivan Cold 6 A

NEW JERSEY

NJ Atlantic Mixed-Humid 4 A

NJ Bergen Cold 5 A

NJ Burlington Mixed-Humid 4 A

NJ Camden Mixed-Humid 4 A

NJ Cape May Mixed-Humid 4 A

NJ Cumberland Mixed-Humid 4 A

NJ Essex Mixed-Humid 4 A

NJ Gloucester Mixed-Humid 4 A

NJ Hudson Mixed-Humid 4 A

NJ Hunterdon Cold 5 A

NJ Mercer Cold 5 A

NJ Middlesex Mixed-Humid 4 A

NJ Monmouth Mixed-Humid 4 A

NJ Morris Cold 5 A

NJ Ocean Mixed-Humid 4 A

NJ Passaic Cold 5 A

NJ Salem Mixed-Humid 4 A

NJ Somerset Cold 5 A

NJ Sussex Cold 5 A

NJ Union Mixed-Humid 4 A

NJ Warren Cold 5 A

NEW MEXICO

NM Bernalillo Mixed-Dry 4 B

NM Catron Cold 5 B

NM Chaves Hot-Dry 3 B

NM Cibola Cold 4 B

NM Colfax Cold 5 B

NM Curry Mixed-Dry 4 B

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 27

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

NM De Baca Mixed-Dry 4 B

NM Doña Ana Hot-Dry 3 B

NM Eddy Hot-Dry 3 B

NM Grant Mixed-Dry 4 B

NM Guadalupe Mixed-Dry 4 B

NM Harding Cold 5 B

NM Hidalgo Hot-Dry 3 B

NM Lea Hot-Dry 3 B

NM Lincoln Mixed-Dry 4 B

NM Los Alamos Cold 5 B

NM Luna Hot-Dry 3 B

NM McKinley Cold 5 B

NM Mora Cold 5 B

NM Otero Hot-Dry 3 B

NM Quay Mixed-Dry 4 B

NM Rio Arriba Cold 5 B

NM Roosevelt Mixed-Dry 4 B

NM San Juan Cold 5 B

NM San Miguel Cold 5 B

NM Sandoval Cold 5 B

NM Santa Fe Cold 5 B

NM Sierra Mixed-Dry 4 B

NM Socorro Mixed-Dry 4 B

NM Taos Cold 5 B

NM Torrance Cold 5 B

NM Union Mixed-Dry 4 B

NM Valencia Mixed-Dry 4 B

NEW YORK

NY Albany Cold 5 A

NY Allegany Cold 6 A

NY Bronx Mixed-Humid 4 A

NY Broome Cold 6 A

NY Cattaraugus Cold 6 A

NY Cayuga Cold 5 A

NY Chautauqua Cold 5 A

NY Chemung Cold 5 A

NY Chenango Cold 6 A

NY Clinton Cold 6 A

NY Columbia Cold 5 A

NY Cortland Cold 5 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

NY Delaware Cold 6 A

NY Dutchess Cold 5 A

NY Erie Cold 5 A

NY Essex Cold 6 A

NY Franklin Cold 6 A

NY Fulton Cold 6 A

NY Genesee Cold 5 A

NY Greene Cold 5 A

NY Hamilton Cold 6 A

NY Herkimer Cold 6 A

NY Jefferson Cold 6 A

NY Kings Mixed-Humid 4 A

NY Lewis Cold 6 A

NY Livingston Cold 5 A

NY Madison Cold 6 A

NY Monroe Cold 5 A

NY Montgomery Cold 6 A

NY Nassau Mixed-Humid 4 A

NY New York Mixed-Humid 4 A

NY Niagara Cold 5 A

NY Oneida Cold 6 A

NY Onondaga Cold 5 A

NY Ontario Cold 5 A

NY Orange Cold 5 A

NY Orleans Cold 5 A

NY Oswego Cold 5 A

NY Otsego Cold 6 A

NY Putnam Cold 5 A

NY Queens Mixed-Humid 4 A

NY Rensselaer Cold 5 A

NY Richmond Mixed-Humid 4 A

NY Rockland Cold 5 A

NY Saratoga Cold 5 A

NY Schenectady Cold 5 A

NY Schoharie Cold 6 A

NY Schuyler Cold 6 A

NY Seneca Cold 5 A

NY St. Lawrence Cold 6 A

NY Steuben Cold 6 A

NY Suffolk Mixed-Humid 4 A

28 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

NY Sullivan Cold 6 A

NY Tioga Cold 5 A

NY Tompkins Cold 6 A

NY Ulster Cold 6 A

NY Warren Cold 6 A

NY Washington Cold 5 A

NY Wayne Cold 5 A

NY Westchester Mixed-Humid 4 A

NY Wyoming Cold 6 A

NY Yates Cold 5 A

NORTH CAROLINA

NC Alamance Mixed-Humid 4 A

NC Alexander Mixed-Humid 4 A

NC Alleghany Cold 5 A

NC Anson Mixed-Humid 3 A

NC Ashe Cold 5 A

NC Avery Cold 5 A

NC Beaufort Mixed-Humid 3 A

NC Bertie Mixed-Humid 4 A

NC Bladen Mixed-Humid 3 A

NC Brunswick Hot-Humid 3 A

NC Buncombe Mixed-Humid 4 A

NC Burke Mixed-Humid 4 A

NC Cabarrus Mixed-Humid 3 A

NC Caldwell Mixed-Humid 4 A

NC Camden Mixed-Humid 3 A

NC Carteret Hot-Humid 3 A

NC Caswell Mixed-Humid 4 A

NC Catawba Mixed-Humid 4 A

NC Chatham Mixed-Humid 4 A

NC Cherokee Mixed-Humid 4 A

NC Chowan Mixed-Humid 3 A

NC Clay Mixed-Humid 4 A

NC Cleveland Mixed-Humid 4 A

NC Columbus Hot-Humid 3 A

NC Craven Mixed-Humid 3 A

NC Cumberland Mixed-Humid 3 A

NC Currituck Mixed-Humid 3 A

NC Dare Mixed-Humid 3 A

NC Davidson Mixed-Humid 3 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

NC Davie Mixed-Humid 4 A

NC Duplin Mixed-Humid 3 A

NC Durham Mixed-Humid 4 A

NC Edgecombe Mixed-Humid 3 A

NC Forsyth Mixed-Humid 4 A

NC Franklin Mixed-Humid 4 A

NC Gaston Mixed-Humid 3 A

NC Gates Mixed-Humid 4 A

NC Graham Mixed-Humid 4 A

NC Granville Mixed-Humid 4 A

NC Greene Mixed-Humid 3 A

NC Guilford Mixed-Humid 4 A

NC Halifax Mixed-Humid 4 A

NC Harnett Mixed-Humid 4 A

NC Haywood Mixed-Humid 4 A

NC Henderson Mixed-Humid 4 A

NC Hertford Mixed-Humid 4 A

NC Hoke Mixed-Humid 3 A

NC Hyde Mixed-Humid 3 A

NC Iredell Mixed-Humid 4 A

NC Jackson Mixed-Humid 4 A

NC Johnston Mixed-Humid 3 A

NC Jones Mixed-Humid 3 A

NC Lee Mixed-Humid 4 A

NC Lenoir Mixed-Humid 3 A

NC Lincoln Mixed-Humid 4 A

NC Macon Mixed-Humid 4 A

NC Madison Mixed-Humid 4 A

NC Martin Mixed-Humid 3 A

NC McDowell Mixed-Humid 4 A

NC Mecklenburg Mixed-Humid 3 A

NC Mitchell Cold 5 A

NC Montgomery Mixed-Humid 3 A

NC Moore Mixed-Humid 3 A

NC Nash Mixed-Humid 4 A

NC New Hanover Hot-Humid 3 A

NC Northampton Mixed-Humid 4 A

NC Onslow Hot-Humid 3 A

NC Orange Mixed-Humid 4 A

NC Pamlico Mixed-Humid 3 A

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 29

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

NC Pasquotank Mixed-Humid 3 A

NC Pender Hot-Humid 3 A

NC Perquimans Mixed-Humid 3 A

NC Person Mixed-Humid 4 A

NC Pitt Mixed-Humid 3 A

NC Polk Mixed-Humid 4 A

NC Randolph Mixed-Humid 3 A

NC Richmond Mixed-Humid 3 A

NC Robeson Mixed-Humid 3 A

NC Rockingham Mixed-Humid 4 A

NC Rowan Mixed-Humid 3 A

NC Rutherford Mixed-Humid 4 A

NC Sampson Mixed-Humid 3 A

NC Scotland Mixed-Humid 3 A

NC Stanly Mixed-Humid 3 A

NC Stokes Mixed-Humid 4 A

NC Surry Mixed-Humid 4 A

NC Swain Mixed-Humid 4 A

NC Transylvania Mixed-Humid 4 A

NC Tyrrell Mixed-Humid 3 A

NC Union Mixed-Humid 3 A

NC Vance Mixed-Humid 4 A

NC Wake Mixed-Humid 4 A

NC Warren Mixed-Humid 4 A

NC Washington Mixed-Humid 3 A

NC Watauga Cold 5 A

NC Wayne Mixed-Humid 3 A

NC Wilkes Mixed-Humid 4 A

NC Wilson Mixed-Humid 3 A

NC Yadkin Mixed-Humid 4 A

NC Yancey Cold 5 A

NORTH DAKOTA

ND Adams Cold 6 A

ND Barnes Very Cold 7 A

ND Benson Very Cold 7 A

ND Billings Cold 6 A

ND Bottineau Very Cold 7 A

ND Bowman Cold 6 A

ND Burke Very Cold 7 A

ND Burleigh Cold 6 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

ND Cass Very Cold 7 A

ND Cavalier Very Cold 7 A

ND Dickey Cold 6 A

ND Divide Very Cold 7 A

ND Dunn Cold 6 A

ND Eddy Very Cold 7 A

ND Emmons Cold 6 A

ND Foster Very Cold 7 A

ND Golden Valley Cold 6 A

ND Grand Forks Very Cold 7 A

ND Grant Cold 6 A

ND Griggs Very Cold 7 A

ND Hettinger Cold 6 A

ND Kidder Very Cold 7 A

ND LaMoure Cold 6 A

ND Logan Cold 6 A

ND McHenry Very Cold 7 A

ND McIntosh Cold 6 A

ND McKenzie Cold 6 A

ND McLean Very Cold 7 A

ND Mercer Cold 6 A

ND Morton Cold 6 A

ND Mountrail Very Cold 7 A

ND Nelson Very Cold 7 A

ND Oliver Cold 6 A

ND Pembina Very Cold 7 A

ND Pierce Very Cold 7 A

ND Ramsey Very Cold 7 A

ND Ransom Cold 6 A

ND Renville Very Cold 7 A

ND Richland Cold 6 A

ND Rolette Very Cold 7 A

ND Sargent Cold 6 A

ND Sheridan Very Cold 7 A

ND Sioux Cold 6 A

ND Slope Cold 6 A

ND Stark Cold 6 A

ND Steele Very Cold 7 A

ND Stutsman Very Cold 7 A

ND Towner Very Cold 7 A

30 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

ND Traill Very Cold 7 A

ND Walsh Very Cold 7 A

ND Ward Very Cold 7 A

ND Wells Very Cold 7 A

ND Williams Very Cold 7 A

OHIO

OH Adams Mixed-Humid 4 A

OH Allen Cold 5 A

OH Ashland Cold 5 A

OH Ashtabula Cold 5 A

OH Athens Cold 5 A

OH Auglaize Cold 5 A

OH Belmont Cold 5 A

OH Brown Mixed-Humid 4 A

OH Butler Cold 5 A

OH Carroll Cold 5 A

OH Champaign Cold 5 A

OH Clark Cold 5 A

OH Clermont Mixed-Humid 4 A

OH Clinton Cold 5 A

OH Columbiana Cold 5 A

OH Coshocton Cold 5 A

OH Crawford Cold 5 A

OH Cuyahoga Cold 5 A

OH Darke Cold 5 A

OH Defiance Cold 5 A

OH Delaware Cold 5 A

OH Erie Cold 5 A

OH Fairfield Cold 5 A

OH Fayette Cold 5 A

OH Franklin Cold 5 A

OH Fulton Cold 5 A

OH Gallia Mixed-Humid 4 A

OH Geauga Cold 5 A

OH Greene Cold 5 A

OH Guernsey Cold 5 A

OH Hamilton Mixed-Humid 4 A

OH Hancock Cold 5 A

OH Hardin Cold 5 A

OH Harrison Cold 5 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

OH Henry Cold 5 A

OH Highland Cold 5 A

OH Hocking Cold 5 A

OH Holmes Cold 5 A

OH Huron Cold 5 A

OH Jackson Cold 5 A

OH Jefferson Cold 5 A

OH Knox Cold 5 A

OH Lake Cold 5 A

OH Lawrence Mixed-Humid 4 A

OH Licking Cold 5 A

OH Logan Cold 5 A

OH Lorain Cold 5 A

OH Lucas Cold 5 A

OH Madison Cold 5 A

OH Mahoning Cold 5 A

OH Marion Cold 5 A

OH Medina Cold 5 A

OH Meigs Cold 5 A

OH Mercer Cold 5 A

OH Miami Cold 5 A

OH Monroe Cold 5 A

OH Montgomery Cold 5 A

OH Morgan Cold 5 A

OH Morrow Cold 5 A

OH Muskingum Cold 5 A

OH Noble Cold 5 A

OH Ottawa Cold 5 A

OH Paulding Cold 5 A

OH Perry Cold 5 A

OH Pickaway Cold 5 A

OH Pike Mixed-Humid 4 A

OH Portage Cold 5 A

OH Preble Cold 5 A

OH Putnam Cold 5 A

OH Richland Cold 5 A

OH Ross Cold 5 A

OH Sandusky Cold 5 A

OH Scioto Mixed-Humid 4 A

OH Seneca Cold 5 A

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 31

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

OH Shelby Cold 5 A

OH Stark Cold 5 A

OH Summit Cold 5 A

OH Trumbull Cold 5 A

OH Tuscarawas Cold 5 A

OH Union Cold 5 A

OH Van Wert Cold 5 A

OH Vinton Cold 5 A

OH Warren Cold 5 A

OH Washington Mixed-Humid 4 A

OH Wayne Cold 5 A

OH Williams Cold 5 A

OH Wood Cold 5 A

OH Wyandot Cold 5 A

OKLAHOMA

OK Adair Mixed-Humid 3 A

OK Alfalfa Mixed-Humid 3 A

OK Atoka Mixed-Humid 3 A

OK Beaver Mixed-Dry 4 B

OK Beckham Mixed-Humid 3 A

OK Blaine Mixed-Humid 3 A

OK Bryan Mixed-Humid 3 A

OK Caddo Mixed-Humid 3 A

OK Canadian Mixed-Humid 3 A

OK Carter Mixed-Humid 3 A

OK Cherokee Mixed-Humid 3 A

OK Choctaw Mixed-Humid 3 A

OK Cimarron Mixed-Dry 4 B

OK Cleveland Mixed-Humid 3 A

OK Coal Mixed-Humid 3 A

OK Comanche Mixed-Humid 3 A

OK Cotton Mixed-Humid 3 A

OK Craig Mixed-Humid 3 A

OK Creek Mixed-Humid 3 A

OK Custer Mixed-Humid 3 A

OK Delaware Mixed-Humid 3 A

OK Dewey Mixed-Humid 3 A

OK Ellis Mixed-Humid 3 A

OK Garfield Mixed-Humid 3 A

OK Garvin Mixed-Humid 3 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

OK Grady Mixed-Humid 3 A

OK Grant Mixed-Humid 3 A

OK Greer Mixed-Humid 3 A

OK Harmon Mixed-Humid 3 A

OK Harper Mixed-Humid 3 A

OK Haskell Mixed-Humid 3 A

OK Hughes Mixed-Humid 3 A

OK Jackson Mixed-Humid 3 A

OK Jefferson Mixed-Humid 3 A

OK Johnston Mixed-Humid 3 A

OK Kay Mixed-Humid 3 A

OK Kingfisher Mixed-Humid 3 A

OK Kiowa Mixed-Humid 3 A

OK Latimer Mixed-Humid 3 A

OK Le Flore Mixed-Humid 3 A

OK Lincoln Mixed-Humid 3 A

OK Logan Mixed-Humid 3 A

OK Love Mixed-Humid 3 A

OK Major Mixed-Humid 3 A

OK Marshall Mixed-Humid 3 A

OK Mayes Mixed-Humid 3 A

OK McClain Mixed-Humid 3 A

OK McCurtain Mixed-Humid 3 A

OK McIntosh Mixed-Humid 3 A

OK Murray Mixed-Humid 3 A

OK Muskogee Mixed-Humid 3 A

OK Noble Mixed-Humid 3 A

OK Nowata Mixed-Humid 3 A

OK Okfuskee Mixed-Humid 3 A

OK Oklahoma Mixed-Humid 3 A

OK Okmulgee Mixed-Humid 3 A

OK Osage Mixed-Humid 3 A

OK Ottawa Mixed-Humid 3 A

OK Pawnee Mixed-Humid 3 A

OK Payne Mixed-Humid 3 A

OK Pittsburg Mixed-Humid 3 A

OK Pontotoc Mixed-Humid 3 A

OK Pottawatomie Mixed-Humid 3 A

OK Pushmataha Mixed-Humid 3 A

OK Roger Mills Mixed-Humid 3 A

32 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

OK Rogers Mixed-Humid 3 A

OK Seminole Mixed-Humid 3 A

OK Sequoyah Mixed-Humid 3 A

OK Stephens Mixed-Humid 3 A

OK Texas Mixed-Dry 4 B

OK Tillman Mixed-Humid 3 A

OK Tulsa Mixed-Humid 3 A

OK Wagoner Mixed-Humid 3 A

OK Washington Mixed-Humid 3 A

OK Washita Mixed-Humid 3 A

OK Woods Mixed-Humid 3 A

OK Woodward Mixed-Humid 3 A

OREGON

OR Baker Cold 5 B

OR Benton Marine 4 C

OR Clackamas Marine 4 C

OR Clatsop Marine 4 C

OR Columbia Marine 4 C

OR Coos Marine 4 C

OR Crook Cold 5 B

OR Curry Marine 4 C

OR Deschutes Cold 5 B

OR Douglas Marine 4 C

OR Gilliam Cold 5 B

OR Grant Cold 5 B

OR Harney Cold 5 B

OR Hood River Cold 5 B

OR Jackson Marine 4 C

OR Jefferson Cold 5 B

OR Josephine Marine 4 C

OR Klamath Cold 5 B

OR Lake Cold 5 B

OR Lane Marine 4 C

OR Lincoln Marine 4 C

OR Linn Marine 4 C

OR Malheur Cold 5 B

OR Marion Marine 4 C

OR Morrow Cold 5 B

OR Multnomah Marine 4 C

OR Polk Marine 4 C

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

OR Sherman Cold 5 B

OR Tillamook Marine 4 C

OR Umatilla Cold 5 B

OR Union Cold 5 B

OR Wallowa Cold 5 B

OR Wasco Cold 5 B

OR Washington Marine 4 C

OR Wheeler Cold 5 B

OR Yamhill Marine 4 C

PENNSYLVANIA

PA Adams Cold 5 A

PA Allegheny Cold 5 A

PA Armstrong Cold 5 A

PA Beaver Cold 5 A

PA Bedford Cold 5 A

PA Berks Cold 5 A

PA Blair Cold 5 A

PA Bradford Cold 5 A

PA Bucks Mixed-Humid 4 A

PA Butler Cold 5 A

PA Cambria Cold 5 A

PA Cameron Cold 6 A

PA Carbon Cold 5 A

PA Centre Cold 5 A

PA Chester Mixed-Humid 4 A

PA Clarion Cold 5 A

PA Clearfield Cold 6 A

PA Clinton Cold 5 A

PA Columbia Cold 5 A

PA Crawford Cold 5 A

PA Cumberland Cold 5 A

PA Dauphin Cold 5 A

PA Delaware Mixed-Humid 4 A

PA Elk Cold 6 A

PA Erie Cold 5 A

PA Fayette Cold 5 A

PA Forest Cold 5 A

PA Franklin Cold 5 A

PA Fulton Cold 5 A

PA Greene Cold 5 A

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 33

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

PA Huntingdon Cold 5 A

PA Indiana Cold 5 A

PA Jefferson Cold 5 A

PA Juniata Cold 5 A

PA Lackawanna Cold 5 A

PA Lancaster Cold 5 A

PA Lawrence Cold 5 A

PA Lebanon Cold 5 A

PA Lehigh Cold 5 A

PA Luzerne Cold 5 A

PA Lycoming Cold 5 A

PA McKean Cold 6 A

PA Mercer Cold 5 A

PA Mifflin Cold 5 A

PA Monroe Cold 5 A

PA Montgomery Mixed-Humid 4 A

PA Montour Cold 5 A

PA Northampton Cold 5 A

PA Northumberland Cold 5 A

PA Perry Cold 5 A

PA Philadelphia Mixed-Humid 4 A

PA Pike Cold 5 A

PA Potter Cold 6 A

PA Schuylkill Cold 5 A

PA Snyder Cold 5 A

PA Somerset Cold 5 A

PA Sullivan Cold 5 A

PA Susquehanna Cold 6 A

PA Tioga Cold 6 A

PA Union Cold 5 A

PA Venango Cold 5 A

PA Warren Cold 5 A

PA Washington Cold 5 A

PA Wayne Cold 6 A

PA Westmoreland Cold 5 A

PA Wyoming Cold 5 A

PA York Mixed-Humid 4 A

RHODE ISLAND

RI Bristol Cold 5 A

RI Kent Cold 5 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

RI Newport Cold 5 A

RI Providence Cold 5 A

RI Washington Cold 5 A

SOUTH CAROLINA

SC Abbeville Mixed-Humid 3 A

SC Aiken Mixed-Humid 3 A

SC Allendale Hot-Humid 3 A

SC Anderson Mixed-Humid 3 A

SC Bamberg Hot-Humid 3 A

SC Barnwell Hot-Humid 3 A

SC Beaufort Hot-Humid 3 A

SC Berkeley Hot-Humid 3 A

SC Calhoun Mixed-Humid 3 A

SC Charleston Hot-Humid 3 A

SC Cherokee Mixed-Humid 3 A

SC Chester Mixed-Humid 3 A

SC Chesterfield Mixed-Humid 3 A

SC Clarendon Mixed-Humid 3 A

SC Colleton Hot-Humid 3 A

SC Darlington Mixed-Humid 3 A

SC Dillon Mixed-Humid 3 A

SC Dorchester Hot-Humid 3 A

SC Edgefield Mixed-Humid 3 A

SC Fairfield Mixed-Humid 3 A

SC Florence Mixed-Humid 3 A

SC Georgetown Hot-Humid 3 A

SC Greenville Mixed-Humid 3 A

SC Greenwood Mixed-Humid 3 A

SC Hampton Hot-Humid 3 A

SC Horry Hot-Humid 3 A

SC Jasper Hot-Humid 3 A

SC Kershaw Mixed-Humid 3 A

SC Lancaster Mixed-Humid 3 A

SC Laurens Mixed-Humid 3 A

SC Lee Mixed-Humid 3 A

SC Lexington Mixed-Humid 3 A

SC Marion Mixed-Humid 3 A

SC Marlboro Mixed-Humid 3 A

SC McCormick Mixed-Humid 3 A

SC Newberry Mixed-Humid 3 A

34 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

SC Oconee Mixed-Humid 3 A

SC Orangeburg Mixed-Humid 3 A

SC Pickens Mixed-Humid 3 A

SC Richland Mixed-Humid 3 A

SC Saluda Mixed-Humid 3 A

SC Spartanburg Mixed-Humid 3 A

SC Sumter Mixed-Humid 3 A

SC Union Mixed-Humid 3 A

SC Williamsburg Mixed-Humid 3 A

SC York Mixed-Humid 3 A

SOUTH DAKOTA

SD Aurora Cold 6 A

SD Beadle Cold 6 A

SD Bennett Cold 5 A

SD Bon Homme Cold 5 A

SD Brookings Cold 6 A

SD Brown Cold 6 A

SD Brule Cold 6 A

SD Buffalo Cold 6 A

SD Butte Cold 6 A

SD Campbell Cold 6 A

SD Charles Mix Cold 5 A

SD Clark Cold 6 A

SD Clay Cold 5 A

SD Codington Cold 6 A

SD Corson Cold 6 A

SD Custer Cold 6 A

SD Davison Cold 6 A

SD Day Cold 6 A

SD Deuel Cold 6 A

SD Dewey Cold 6 A

SD Douglas Cold 5 A

SD Edmunds Cold 6 A

SD Fall River Cold 6 A

SD Faulk Cold 6 A

SD Grant Cold 6 A

SD Gregory Cold 5 A

SD Haakon Cold 6 A

SD Hamlin Cold 6 A

SD Hand Cold 6 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

SD Hanson Cold 6 A

SD Harding Cold 6 A

SD Hughes Cold 6 A

SD Hutchinson Cold 5 A

SD Hyde Cold 6 A

SD Jackson Cold 5 A

SD Jerauld Cold 6 A

SD Jones Cold 6 A

SD Kingsbury Cold 6 A

SD Lake Cold 6 A

SD Lawrence Cold 6 A

SD Lincoln Cold 6 A

SD Lyman Cold 6 A

SD Marshall Cold 6 A

SD McCook Cold 6 A

SD McPherson Cold 6 A

SD Meade Cold 6 A

SD Mellette Cold 5 A

SD Miner Cold 6 A

SD Minnehaha Cold 6 A

SD Moody Cold 6 A

SD Pennington Cold 6 A

SD Perkins Cold 6 A

SD Potter Cold 6 A

SD Roberts Cold 6 A

SD Sanborn Cold 6 A

SD Shannon Cold 6 A

SD Spink Cold 6 A

SD Stanley Cold 6 A

SD Sully Cold 6 A

SD Todd Cold 5 A

SD Tripp Cold 5 A

SD Turner Cold 6 A

SD Union Cold 5 A

SD Walworth Cold 6 A

SD Yankton Cold 5 A

SD Ziebach Cold 6 A

TENNESSEE

TN Anderson Mixed-Humid 4 A

TN Bedford Mixed-Humid 4 A

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 35

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

TN Benton Mixed-Humid 4 A

TN Bledsoe Mixed-Humid 4 A

TN Blount Mixed-Humid 4 A

TN Bradley Mixed-Humid 4 A

TN Campbell Mixed-Humid 4 A

TN Cannon Mixed-Humid 4 A

TN Carroll Mixed-Humid 4 A

TN Carter Mixed-Humid 4 A

TN Cheatham Mixed-Humid 4 A

TN Chester Mixed-Humid 3 A

TN Claiborne Mixed-Humid 4 A

TN Clay Mixed-Humid 4 A

TN Cocke Mixed-Humid 4 A

TN Coffee Mixed-Humid 4 A

TN Crockett Mixed-Humid 3 A

TN Cumberland Mixed-Humid 4 A

TN Davidson Mixed-Humid 4 A

TN Decatur Mixed-Humid 4 A

TN DeKalb Mixed-Humid 4 A

TN Dickson Mixed-Humid 4 A

TN Dyer Mixed-Humid 3 A

TN Fayette Mixed-Humid 3 A

TN Fentress Mixed-Humid 4 A

TN Franklin Mixed-Humid 4 A

TN Gibson Mixed-Humid 4 A

TN Giles Mixed-Humid 4 A

TN Grainger Mixed-Humid 4 A

TN Greene Mixed-Humid 4 A

TN Grundy Mixed-Humid 4 A

TN Hamblen Mixed-Humid 4 A

TN Hamilton Mixed-Humid 4 A

TN Hancock Mixed-Humid 4 A

TN Hardeman Mixed-Humid 3 A

TN Hardin Mixed-Humid 3 A

TN Hawkins Mixed-Humid 4 A

TN Haywood Mixed-Humid 3 A

TN Henderson Mixed-Humid 3 A

TN Henry Mixed-Humid 4 A

TN Hickman Mixed-Humid 4 A

TN Houston Mixed-Humid 4 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

TN Humphreys Mixed-Humid 4 A

TN Jackson Mixed-Humid 4 A

TN Jefferson Mixed-Humid 4 A

TN Johnson Mixed-Humid 4 A

TN Knox Mixed-Humid 4 A

TN Lake Mixed-Humid 3 A

TN Lauderdale Mixed-Humid 3 A

TN Lawrence Mixed-Humid 4 A

TN Lewis Mixed-Humid 4 A

TN Lincoln Mixed-Humid 4 A

TN Loudon Mixed-Humid 4 A

TN Macon Mixed-Humid 4 A

TN Madison Mixed-Humid 3 A

TN Marion Mixed-Humid 4 A

TN Marshall Mixed-Humid 4 A

TN Maury Mixed-Humid 4 A

TN McMinn Mixed-Humid 4 A

TN McNairy Mixed-Humid 3 A

TN Meigs Mixed-Humid 4 A

TN Monroe Mixed-Humid 4 A

TN Montgomery Mixed-Humid 4 A

TN Moore Mixed-Humid 4 A

TN Morgan Mixed-Humid 4 A

TN Obion Mixed-Humid 4 A

TN Overton Mixed-Humid 4 A

TN Perry Mixed-Humid 4 A

TN Pickett Mixed-Humid 4 A

TN Polk Mixed-Humid 4 A

TN Putnam Mixed-Humid 4 A

TN Rhea Mixed-Humid 4 A

TN Roane Mixed-Humid 4 A

TN Robertson Mixed-Humid 4 A

TN Rutherford Mixed-Humid 4 A

TN Scott Mixed-Humid 4 A

TN Sequatchie Mixed-Humid 4 A

TN Sevier Mixed-Humid 4 A

TN Shelby Mixed-Humid 3 A

TN Smith Mixed-Humid 4 A

TN Stewart Mixed-Humid 4 A

TN Sullivan Mixed-Humid 4 A

36 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

TN Sumner Mixed-Humid 4 A

TN Tipton Mixed-Humid 3 A

TN Trousdale Mixed-Humid 4 A

TN Unicoi Mixed-Humid 4 A

TN Union Mixed-Humid 4 A

TN Van Buren Mixed-Humid 4 A

TN Warren Mixed-Humid 4 A

TN Washington Mixed-Humid 4 A

TN Wayne Mixed-Humid 4 A

TN Weakley Mixed-Humid 4 A

TN White Mixed-Humid 4 A

TN Williamson Mixed-Humid 4 A

TN Wilson Mixed-Humid 4 A

TEXAS

TX Anderson Hot-Humid 2 A

TX Andrews Hot-Dry 3 B

TX Angelina Hot-Humid 2 A

TX Aransas Hot-Humid 2 A

TX Archer Mixed-Humid 3 A

TX Armstrong Mixed-Dry 4 B

TX Atascosa Hot-Humid 2 A

TX Austin Hot-Humid 2 A

TX Bailey Mixed-Dry 4 B

TX Bandera Hot-Humid 2 B

TX Bastrop Hot-Humid 2 A

TX Baylor Hot-Dry 3 B

TX Bee Hot-Humid 2 A

TX Bell Hot-Humid 2 A

TX Bexar Hot-Humid 2 A

TX Blanco Hot-Humid 3 A

TX Borden Hot-Dry 3 B

TX Bosque Hot-Humid 2 A

TX Bowie Hot-Humid 3 A

TX Brazoria Hot-Humid 2 A

TX Brazos Hot-Humid 2 A

TX Brewster Hot-Dry 3 B

TX Briscoe Mixed-Dry 4 B

TX Brooks Hot-Humid 2 A

TX Brown Hot-Humid 3 A

TX Burleson Hot-Humid 2 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

TX Burnet Hot-Humid 3 A

TX Caldwell Hot-Humid 2 A

TX Calhoun Hot-Humid 2 A

TX Callahan Hot-Dry 3 B

TX Cameron Hot-Humid 2 A

TX Camp Hot-Humid 3 A

TX Carson Mixed-Dry 4 B

TX Cass Hot-Humid 3 A

TX Castro Mixed-Dry 4 B

TX Chambers Hot-Humid 2 A

TX Cherokee Hot-Humid 2 A

TX Childress Hot-Dry 3 B

TX Clay Mixed-Humid 3 A

TX Cochran Mixed-Dry 4 B

TX Coke Hot-Dry 3 B

TX Coleman Hot-Dry 3 B

TX Collin Hot-Humid 3 A

TX Collingsworth Hot-Dry 3 B

TX Colorado Hot-Humid 2 A

TX Comal Hot-Humid 2 A

TX Comanche Hot-Humid 3 A

TX Concho Hot-Dry 3 B

TX Cooke Mixed-Humid 3 A

TX Coryell Hot-Humid 2 A

TX Cottle Hot-Dry 3 B

TX Crane Hot-Dry 3 B

TX Crockett Hot-Dry 3 B

TX Crosby Hot-Dry 3 B

TX Culberson Hot-Dry 3 B

TX Dallam Mixed-Dry 4 B

TX Dallas Hot-Humid 3 A

TX Dawson Hot-Dry 3 B

TX Deaf Smith Mixed-Dry 4 B

TX Delta Hot-Humid 3 A

TX Denton Hot-Humid 3 A

TX DeWitt Hot-Humid 2 A

TX Dickens Hot-Dry 3 B

TX Dimmit Hot-Humid 2 B

TX Donley Mixed-Dry 4 B

TX Duval Hot-Humid 2 A

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 37

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

TX Eastland Mixed-Humid 3 A

TX Ector Hot-Dry 3 B

TX Edwards Hot-Humid 2 B

TX El Paso Hot-Dry 3 B

TX Ellis Hot-Humid 3 A

TX Erath Hot-Humid 3 A

TX Falls Hot-Humid 2 A

TX Fannin Mixed-Humid 3 A

TX Fayette Hot-Humid 2 A

TX Fisher Hot-Dry 3 B

TX Floyd Mixed-Dry 4 B

TX Foard Hot-Dry 3 B

TX Fort Bend Hot-Humid 2 A

TX Franklin Hot-Humid 3 A

TX Freestone Hot-Humid 2 A

TX Frio Hot-Humid 2 B

TX Gaines Hot-Dry 3 B

TX Galveston Hot-Humid 2 A

TX Garza Hot-Dry 3 B

TX Gillespie Hot-Humid 3 A

TX Glasscock Hot-Dry 3 B

TX Goliad Hot-Humid 2 A

TX Gonzales Hot-Humid 2 A

TX Gray Mixed-Dry 4 B

TX Grayson Mixed-Humid 3 A

TX Gregg Hot-Humid 3 A

TX Grimes Hot-Humid 2 A

TX Guadalupe Hot-Humid 2 A

TX Hale Mixed-Dry 4 B

TX Hall Hot-Dry 3 B

TX Hamilton Hot-Humid 3 A

TX Hansford Mixed-Dry 4 B

TX Hardeman Hot-Dry 3 B

TX Hardin Hot-Humid 2 A

TX Harris Hot-Humid 2 A

TX Harrison Hot-Humid 3 A

TX Hartley Mixed-Dry 4 B

TX Haskell Hot-Dry 3 B

TX Hays Hot-Humid 2 A

TX Hemphill Hot-Dry 3 B

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

TX Henderson Hot-Humid 3 A

TX Hidalgo Hot-Humid 2 A

TX Hill Hot-Humid 2 A

TX Hockley Mixed-Dry 4 B

TX Hood Hot-Humid 3 A

TX Hopkins Hot-Humid 3 A

TX Houston Hot-Humid 2 A

TX Howard Hot-Dry 3 B

TX Hudspeth Hot-Dry 3 B

TX Hunt Hot-Humid 3 A

TX Hutchinson Mixed-Dry 4 B

TX Irion Hot-Dry 3 B

TX Jack Mixed-Humid 3 A

TX Jackson Hot-Humid 2 A

TX Jasper Hot-Humid 2 A

TX Jeff Davis Hot-Dry 3 B

TX Jefferson Hot-Humid 2 A

TX Jim Hogg Hot-Humid 2 A

TX Jim Wells Hot-Humid 2 A

TX Johnson Hot-Humid 3 A

TX Jones Hot-Dry 3 B

TX Karnes Hot-Humid 2 A

TX Kaufman Hot-Humid 3 A

TX Kendall Hot-Humid 3 A

TX Kenedy Hot-Humid 2 A

TX Kent Hot-Dry 3 B

TX Kerr Hot-Dry 3 B

TX Kimble Hot-Dry 3 B

TX King Hot-Dry 3 B

TX Kinney Hot-Humid 2 B

TX Kleberg Hot-Humid 2 A

TX Knox Hot-Dry 3 B

TX La Salle Hot-Humid 2 B

TX Lamar Hot-Humid 3 A

TX Lamb Mixed-Dry 4 B

TX Lampasas Hot-Humid 3 A

TX Lavaca Hot-Humid 2 A

TX Lee Hot-Humid 2 A

TX Leon Hot-Humid 2 A

TX Liberty Hot-Humid 2 A

38 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

TX Limestone Hot-Humid 2 A

TX Lipscomb Mixed-Dry 4 B

TX Live Oak Hot-Humid 2 A

TX Llano Hot-Humid 3 A

TX Loving Hot-Dry 3 B

TX Lubbock Hot-Dry 3 B

TX Lynn Hot-Dry 3 B

TX Madison Hot-Humid 2 A

TX Marion Hot-Humid 3 A

TX Martin Hot-Dry 3 B

TX Mason Hot-Dry 3 B

TX Matagorda Hot-Humid 2 A

TX Maverick Hot-Humid 2 B

TX McCulloch Hot-Dry 3 B

TX McLennan Hot-Humid 2 A

TX McMullen Hot-Humid 2 A

TX Medina Hot-Humid 2 B

TX Menard Hot-Dry 3 B

TX Midland Hot-Dry 3 B

TX Milam Hot-Humid 2 A

TX Mills Hot-Humid 3 A

TX Mitchell Hot-Dry 3 B

TX Montague Mixed-Humid 3 A

TX Montgomery Hot-Humid 2 A

TX Moore Mixed-Dry 4 B

TX Morris Hot-Humid 3 A

TX Motley Hot-Dry 3 B

TX Nacogdoches Hot-Humid 3 A

TX Navarro Hot-Humid 3 A

TX Newton Hot-Humid 2 A

TX Nolan Hot-Dry 3 B

TX Nueces Hot-Humid 2 A

TX Ochiltree Mixed-Dry 4 B

TX Oldham Mixed-Dry 4 B

TX Orange Hot-Humid 2 A

TX Palo Pinto Mixed-Humid 3 A

TX Panola Hot-Humid 3 A

TX Parker Hot-Humid 3 A

TX Parmer Mixed-Dry 4 B

TX Pecos Hot-Dry 3 B

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

TX Polk Hot-Humid 2 A

TX Potter Mixed-Dry 4 B

TX Presidio Hot-Dry 3 B

TX Rains Hot-Humid 3 A

TX Randall Mixed-Dry 4 B

TX Reagan Hot-Dry 3 B

TX Real Hot-Humid 2 B

TX Red River Hot-Humid 3 A

TX Reeves Hot-Dry 3 B

TX Refugio Hot-Humid 2 A

TX Roberts Mixed-Dry 4 B

TX Robertson Hot-Humid 2 A

TX Rockwall Hot-Humid 3 A

TX Runnels Hot-Dry 3 B

TX Rusk Hot-Humid 3 A

TX Sabine Hot-Humid 3 A

TX San Augustine Hot-Humid 3 A

TX San Jacinto Hot-Humid 2 A

TX San Patricio Hot-Humid 2 A

TX San Saba Hot-Humid 3 A

TX Schleicher Hot-Dry 3 B

TX Scurry Hot-Dry 3 B

TX Shackelford Hot-Dry 3 B

TX Shelby Hot-Humid 3 A

TX Sherman Mixed-Dry 4 B

TX Smith Hot-Humid 3 A

TX Somervell Hot-Humid 3 A

TX Starr Hot-Humid 2 A

TX Stephens Mixed-Humid 3 A

TX Sterling Hot-Dry 3 B

TX Stonewall Hot-Dry 3 B

TX Sutton Hot-Dry 3 B

TX Swisher Mixed-Dry 4 B

TX Tarrant Hot-Humid 3 A

TX Taylor Hot-Dry 3 B

TX Terrell Hot-Dry 3 B

TX Terry Hot-Dry 3 B

TX Throckmorton Hot-Dry 3 B

TX Titus Hot-Humid 3 A

TX Tom Green Hot-Dry 3 B

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 39

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

TX Travis Hot-Humid 2 A

TX Trinity Hot-Humid 2 A

TX Tyler Hot-Humid 2 A

TX Upshur Hot-Humid 3 A

TX Upton Hot-Dry 3 B

TX Uvalde Hot-Humid 2 B

TX Val Verde Hot-Humid 2 B

TX Van Zandt Hot-Humid 3 A

TX Victoria Hot-Humid 2 A

TX Walker Hot-Humid 2 A

TX Waller Hot-Humid 2 A

TX Ward Hot-Dry 3 B

TX Washington Hot-Humid 2 A

TX Webb Hot-Humid 2 B

TX Wharton Hot-Humid 2 A

TX Wheeler Hot-Dry 3 B

TX Wichita Mixed-Humid 3 A

TX Wilbarger Hot-Dry 3 B

TX Willacy Hot-Humid 2 A

TX Williamson Hot-Humid 2 A

TX Wilson Hot-Humid 2 A

TX Winkler Hot-Dry 3 B

TX Wise Mixed-Humid 3 A

TX Wood Hot-Humid 3 A

TX Yoakum Mixed-Dry 4 B

TX Young Mixed-Humid 3 A

TX Zapata Hot-Humid 2 B

TX Zavala Hot-Humid 2 B

UTAH

UT Beaver Cold 5 B

UT Box Elder Cold 6 B

UT Cache Cold 6 B

UT Carbon Cold 6 B

UT Daggett Cold 6 B

UT Davis Cold 5 B

UT Duchesne Cold 6 B

UT Emery Cold 5 B

UT Garfield Cold 5 B

UT Grand Cold 5 B

UT Iron Cold 5 B

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

UT Juab Cold 5 B

UT Kane Cold 5 B

UT Millard Cold 5 B

UT Morgan Cold 6 B

UT Piute Cold 5 B

UT Rich Cold 6 B

UT Salt Lake Cold 5 B

UT San Juan Cold 5 B

UT Sanpete Cold 5 B

UT Sevier Cold 5 B

UT Summit Cold 6 B

UT Tooele Cold 5 B

UT Uintah Cold 6 B

UT Utah Cold 5 B

UT Wasatch Cold 6 B

UT Washington Hot-Dry 3 B

UT Wayne Cold 5 B

UT Weber Cold 5 B

VERMONT

VT Addison Cold 6 A

VT Bennington Cold 6 A

VT Caledonia Cold 6 A

VT Chittenden Cold 6 A

VT Essex Cold 6 A

VT Franklin Cold 6 A

VT Grand Isle Cold 6 A

VT Lamoille Cold 6 A

VT Orange Cold 6 A

VT Orleans Cold 6 A

VT Rutland Cold 6 A

VT Washington Cold 6 A

VT Windham Cold 6 A

VT Windsor Cold 6 A

VIRGINIA

VA Accomack Mixed-Humid 4 A

VA Albemarle Mixed-Humid 4 A

VA Alexandria (city) Mixed-Humid 4 A

VA Alleghany Mixed-Humid 4 A

VA Amelia Mixed-Humid 4 A

VA Amherst Mixed-Humid 4 A

40 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

VA Appomattox Mixed-Humid 4 A

VA Arlington Mixed-Humid 4 A

VA Augusta Mixed-Humid 4 A

VA Bath Mixed-Humid 4 A

VA Bedford Mixed-Humid 4 A

VA Bedford (city) Mixed-Humid 4 A

VA Bland Mixed-Humid 4 A

VA Botetourt Mixed-Humid 4 A

VA Bristol (city) Mixed-Humid 4 A

VA Brunswick Mixed-Humid 4 A

VA Buchanan Mixed-Humid 4 A

VA Buckingham Mixed-Humid 4 A

VA Buena Vista 

(city)

Mixed-Humid 4 A

VA Campbell Mixed-Humid 4 A

VA Caroline Mixed-Humid 4 A

VA Carroll Mixed-Humid 4 A

VA Charles City Mixed-Humid 4 A

VA Charlotte Mixed-Humid 4 A

VA Charlottesville 

(city)

Mixed-Humid 4 A

VA Chesapeake 

(city)

Mixed-Humid 4 A

VA Chesterfield Mixed-Humid 4 A

VA Clarke Mixed-Humid 4 A

VA Clifton Forge 

(city)

Mixed-Humid 4 A

VA Colonial Heights 

(city)

Mixed-Humid 4 A

VA Covington (city) Mixed-Humid 4 A

VA Craig Mixed-Humid 4 A

VA Culpeper Mixed-Humid 4 A

VA Cumberland Mixed-Humid 4 A

VA Danville (city) Mixed-Humid 4 A

VA Dickenson Mixed-Humid 4 A

VA Dinwiddie Mixed-Humid 4 A

VA Emporia (city) Mixed-Humid 4 A

VA Essex Mixed-Humid 4 A

VA Fairfax Mixed-Humid 4 A

VA Fairfax (city) Mixed-Humid 4 A

VA Falls Church (city) Mixed-Humid 4 A

VA Fauquier Mixed-Humid 4 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

VA Floyd Mixed-Humid 4 A

VA Fluvanna Mixed-Humid 4 A

VA Franklin Mixed-Humid 4 A

VA Franklin (city) Mixed-Humid 4 A

VA Frederick Mixed-Humid 4 A

VA Fredericksburg 

(city)

Mixed-Humid 4 A

VA Galax (city) Mixed-Humid 4 A

VA Giles Mixed-Humid 4 A

VA Gloucester Mixed-Humid 4 A

VA Goochland Mixed-Humid 4 A

VA Grayson Mixed-Humid 4 A

VA Greene Mixed-Humid 4 A

VA Greensville Mixed-Humid 4 A

VA Halifax Mixed-Humid 4 A

VA Hampton (city) Mixed-Humid 4 A

VA Hanover Mixed-Humid 4 A

VA Harrisonburg 

(city)

Mixed-Humid 4 A

VA Henrico Mixed-Humid 4 A

VA Henry Mixed-Humid 4 A

VA Highland Mixed-Humid 4 A

VA Hopewell (city) Mixed-Humid 4 A

VA Isle of Wight Mixed-Humid 4 A

VA James City Mixed-Humid 4 A

VA King and Queen Mixed-Humid 4 A

VA King George Mixed-Humid 4 A

VA King William Mixed-Humid 4 A

VA Lancaster Mixed-Humid 4 A

VA Lee Mixed-Humid 4 A

VA Lexington (city) Mixed-Humid 4 A

VA Loudoun Mixed-Humid 4 A

VA Louisa Mixed-Humid 4 A

VA Lunenburg Mixed-Humid 4 A

VA Lynchburg (city) Mixed-Humid 4 A

VA Madison Mixed-Humid 4 A

VA Manassas (city) Mixed-Humid 4 A

VA Manassas Park 

(city)

Mixed-Humid 4 A

VA Martinsville 

(city)

Mixed-Humid 4 A

VA Mathews Mixed-Humid 4 A

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 41

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

VA Mecklenburg Mixed-Humid 4 A

VA Middlesex Mixed-Humid 4 A

VA Montgomery Mixed-Humid 4 A

VA Nelson Mixed-Humid 4 A

VA New Kent Mixed-Humid 4 A

VA Newport News 

(city)

Mixed-Humid 4 A

VA Norfolk (city) Mixed-Humid 4 A

VA Northampton Mixed-Humid 4 A

VA Northumberland Mixed-Humid 4 A

VA Norton (city) Mixed-Humid 4 A

VA Nottoway Mixed-Humid 4 A

VA Orange Mixed-Humid 4 A

VA Page Mixed-Humid 4 A

VA Patrick Mixed-Humid 4 A

VA Petersburg 

(city)

Mixed-Humid 4 A

VA Pittsylvania Mixed-Humid 4 A

VA Poquoson (city) Mixed-Humid 4 A

VA Portsmouth 

(city)

Mixed-Humid 4 A

VA Powhatan Mixed-Humid 4 A

VA Prince Edward Mixed-Humid 4 A

VA Prince George Mixed-Humid 4 A

VA Prince William Mixed-Humid 4 A

VA Pulaski Mixed-Humid 4 A

VA Radford (city) Mixed-Humid 4 A

VA Rappahannock Mixed-Humid 4 A

VA Richmond Mixed-Humid 4 A

VA Richmond (city) Mixed-Humid 4 A

VA Roanoke Mixed-Humid 4 A

VA Roanoke (city) Mixed-Humid 4 A

VA Rockbridge Mixed-Humid 4 A

VA Rockingham Mixed-Humid 4 A

VA Russell Mixed-Humid 4 A

VA Salem (city) Mixed-Humid 4 A

VA Scott Mixed-Humid 4 A

VA Shenandoah Mixed-Humid 4 A

VA Smyth Mixed-Humid 4 A

VA Southampton Mixed-Humid 4 A

VA Spotsylvania Mixed-Humid 4 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

VA Stafford Mixed-Humid 4 A

VA Staunton (city) Mixed-Humid 4 A

VA Suffolk (city) Mixed-Humid 4 A

VA Surry Mixed-Humid 4 A

VA Sussex Mixed-Humid 4 A

VA Tazewell Mixed-Humid 4 A

VA Virginia Beach 

(city)

Mixed-Humid 4 A

VA Warren Mixed-Humid 4 A

VA Washington Mixed-Humid 4 A

VA Waynesboro (city) Mixed-Humid 4 A

VA Westmoreland Mixed-Humid 4 A

VA Williamsburg (city) Mixed-Humid 4 A

VA Winchester (city) Mixed-Humid 4 A

VA Wise Mixed-Humid 4 A

VA Wythe Mixed-Humid 4 A

VA York Mixed-Humid 4 A

WASHINGTON

WA Adams Cold 5 B

WA Asotin Cold 5 B

WA Benton Cold 5 B

WA Chelan Cold 5 B

WA Clallam Marine 4 C

WA Clark Marine 4 C

WA Columbia Cold 5 B

WA Cowlitz Marine 4 C

WA Douglas Cold 5 B

WA Ferry Cold 6 B

WA Franklin Cold 5 B

WA Garfield Cold 5 B

WA Grant Cold 5 B

WA Grays Harbor Marine 4 C

WA Island Cold 4 C

WA Jefferson Marine 4 C

WA King Marine 4 C

WA Kitsap Marine 4 C

WA Kittitas Cold 5 B

WA Klickitat Cold 5 B

WA Lewis Marine 4 C

WA Lincoln Cold 5 B

42 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

WA Mason Marine 4 C

WA Okanogan Cold 6 B

WA Pacific Marine 4 C

WA Pend Oreille Cold 6 B

WA Pierce Marine 4 C

WA San Juan Cold 4 C

WA Skagit Marine 4 C

WA Skamania Cold 5 B

WA Snohomish Marine 4 C

WA Spokane Cold 5 B

WA Stevens Cold 5 B

WA Thurston Marine 4 C

WA Wahkiakum Marine 4 C

WA Walla Walla Cold 5 B

WA Whatcom Marine 4 C

WA Whitman Cold 5 B

WA Yakima Cold 5 C

WEST VIRGINIA

WV Barbour Cold 5 A

WV Berkeley Mixed-Humid 4 A

WV Boone Mixed-Humid 4 A

WV Braxton Mixed-Humid 4 A

WV Brooke Cold 5 A

WV Cabell Mixed-Humid 4 A

WV Calhoun Mixed-Humid 4 A

WV Clay Mixed-Humid 4 A

WV Doddridge Cold 5 A

WV Fayette Cold 5 A

WV Gilmer Mixed-Humid 4 A

WV Grant Cold 5 A

WV Greenbrier Cold 5 A

WV Hampshire Cold 5 A

WV Hancock Cold 5 A

WV Hardy Cold 5 A

WV Harrison Cold 5 A

WV Jackson Mixed-Humid 4 A

WV Jefferson Mixed-Humid 4 A

WV Kanawha Mixed-Humid 4 A

WV Lewis Cold 5 A

WV Lincoln Mixed-Humid 4 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

WV Logan Mixed-Humid 4 A

WV Marion Cold 5 A

WV Marshall Cold 5 A

WV Mason Mixed-Humid 4 A

WV McDowell Mixed-Humid 4 A

WV Mercer Mixed-Humid 4 A

WV Mineral Cold 5 A

WV Mingo Mixed-Humid 4 A

WV Monongalia Cold 5 A

WV Monroe Mixed-Humid 4 A

WV Morgan Mixed-Humid 4 A

WV Nicholas Cold 5 A

WV Ohio Cold 5 A

WV Pendleton Cold 5 A

WV Pleasants Mixed-Humid 4 A

WV Pocahontas Cold 5 A

WV Preston Cold 5 A

WV Putnam Mixed-Humid 4 A

WV Raleigh Cold 5 A

WV Randolph Cold 5 A

WV Ritchie Mixed-Humid 4 A

WV Roane Mixed-Humid 4 A

WV Summers Cold 5 A

WV Taylor Cold 5 A

WV Tucker Cold 5 A

WV Tyler Mixed-Humid 4 A

WV Upshur Cold 5 A

WV Wayne Mixed-Humid 4 A

WV Webster Cold 5 A

WV Wetzel Cold 5 A

WV Wirt Mixed-Humid 4 A

WV Wood Mixed-Humid 4 A

WV Wyoming Mixed-Humid 4 A

WISCONSIN

WI Adams Cold 6 A

WI Ashland Very Cold 7 A

WI Barron Cold 6 A

WI Bayfield Very Cold 7 A

WI Brown Cold 6 A

WI Buffalo Cold 6 A

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 43

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

WI Burnett Very Cold 7 A

WI Calumet Cold 6 A

WI Chippewa Cold 6 A

WI Clark Cold 6 A

WI Columbia Cold 6 A

WI Crawford Cold 6 A

WI Dane Cold 6 A

WI Dodge Cold 6 A

WI Door Cold 6 A

WI Douglas Very Cold 7 A

WI Dunn Cold 6 A

WI Eau Claire Cold 6 A

WI Florence Very Cold 7 A

WI Fond du Lac Cold 6 A

WI Forest Very Cold 7 A

WI Grant Cold 6 A

WI Green Cold 6 A

WI Green Lake Cold 6 A

WI Iowa Cold 6 A

WI Iron Very Cold 7 A

WI Jackson Cold 6 A

WI Jefferson Cold 6 A

WI Juneau Cold 6 A

WI Kenosha Cold 6 A

WI Kewaunee Cold 6 A

WI La Crosse Cold 6 A

WI Lafayette Cold 6 A

WI Langlade Very Cold 7 A

WI Lincoln Very Cold 7 A

WI Manitowoc Cold 6 A

WI Marathon Cold 6 A

WI Marinette Cold 6 A

WI Marquette Cold 6 A

WI Menominee Cold 6 A

WI Milwaukee Cold 6 A

WI Monroe Cold 6 A

WI Oconto Cold 6 A

WI Oneida Very Cold 7 A

WI Outagamie Cold 6 A

WI Ozaukee Cold 6 A

WI Pepin Cold 6 A

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

WI Pierce Cold 6 A

WI Polk Cold 6 A

WI Portage Cold 6 A

WI Price Very Cold 7 A

WI Racine Cold 6 A

WI Richland Cold 6 A

WI Rock Cold 6 A

WI Rusk Cold 6 A

WI Sauk Cold 6 A

WI Sawyer Very Cold 7 A

WI Shawano Cold 6 A

WI Sheboygan Cold 6 A

WI St. Croix Cold 6 A

WI Taylor Very Cold 7 A

WI Trempealeau Cold 6 A

WI Vernon Cold 6 A

WI Vilas Very Cold 7 A

WI Walworth Cold 6 A

WI Washburn Very Cold 7 A

WI Washington Cold 6 A

WI Waukesha Cold 6 A

WI Waupaca Cold 6 A

WI Waushara Cold 6 A

WI Winnebago Cold 6 A

WI Wood Cold 6 A

WYOMING

WY Albany Cold 6 B

WY Big Horn Cold 6 B

WY Campbell Cold 6 B

WY Carbon Cold 6 B

WY Converse Cold 6 B

WY Crook Cold 6 B

WY Fremont Cold 6 B

WY Goshen Cold 5 B

WY Hot Springs Cold 6 B

WY Johnson Cold 6 B

WY Laramie Cold 6 B

WY Lincoln Very Cold 7 B

WY Natrona Cold 6 B

WY Niobrara Cold 6 B

WY Park Cold 6 B

44 Volume 7.3 Guide to Determining Climate Regions by County – August 2015

BUILDING AMERICA BEST PRACTICES SERIES
Counties of the United States by Building America and IECC Climate Zone

Version 6, August 20, 2015

State County

BA Climate 

Zone

IECC Climate 

Zone (1-8)

IECC 

Moisture 

Regime

WY Platte Cold 5 B

WY Sheridan Cold 6 B

WY Sublette Very Cold 7 B

WY Sweetwater Cold 6 B

WY Teton Very Cold 7 B

WY Uinta Cold 6 B

WY Washakie Cold 6 B

WY Weston Cold 6 B

Volume 7.3. Guide to Determining Climate Regions by County – August 2015 45

BUILDING AMERICA BEST PRACTICES SERIES
BUILDING TECHNOLOGIES OFFICE

PNNL-17211 Rev. 3 August 2015

Printed with a renewable-source ink on paper containing at 

least 50% wastepaper, including 10% post-consumer waste.