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NOAA Technical Memorandum GLERL-130

COMPUTERIZED NATIONAL WEATHER SERVICE GREAT LAKES ICE REPORTS 

FOR WINTER SEASONS 1899-1970

Raymond A. Assel

NOAA, Great Lakes Environmental Research Laboratory, Ann Arbor, MI 48105

Great Lakes Environmental Research Laboratory

Ann Arbor, Michigan 

December 2004

UNITED STATES

DEPARTMENT OF COMMERCE

Donald Evans

Secretary

NATIONAL OCEANIC AND

ATMOSPHERIC ADMINISTRATION

Conrad C. Lautenbacher, Jr.

Administrator
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NOTICE

Mention of a commercial company or product does not constitute an endorsement 

by the NOAA. Use of information from this publication concerning proprietary 

products or the tests of such products for publicity or advertising purposes is not 

authorized. This is GLERL Contribution No. 1339.

This publication is available as a PDF file and can be downloaded from GLERL’s 

web site: www.glerl.noaa.gov. Hard copies can be requested from GLERL, 

Information Services, 2205 Commonwealth Blvd., Ann Arbor, MI 48105.

pubs.glerl@noaa.gov.

ACKNOWLEDGEMENTS

This work was funded in part through a NOAA Climate Database Modernization 

Program (CDMP) proposal. Paul Molinari of Lason did much of the digitizing of 

the historical NWS ice reports.
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TABLE OF CONTENTS

ABSTRACT-------------------------------------------------------------------------------------------------4

Intoduction---------------------------------------------------------------------------------------------------4

Data -----------------------------------------------------------------------------------------------------5

Site Temporal Distribution --------------------------------------------------------------------------------5

Site Locations -----------------------------------------------------------------------------------------------6

Site Aliases --------------------------------------------------------------------------------------------------6

Summary-----------------------------------------------------------------------------------------------------9

References ---------------------------------------------------------------------------------------------------9

APPENDICES

1. Individual Site Ice Reports for all Winters: 1899-1970 ----------------------------------------- 25

2. Individual Winter Season Aggregated Site Ice Reports ---------------------------------------- 26

3. Image File Names and Dates of Original NWS Ice Reports------------------------------------ 27

4. Distribution of Number of Reports per Site per Winter ----------------------------------------- 31

LIST OF TABLES

Table 1. Ice Condition Codes-------------------------------------------------------------------------- 11

Table 2. Example of Individual site Tabulation ----------------------------------------------------- 12

Table 3. Example of Individual winter season aggregated site Tabulation ---------------------- 13

Table 4. Comprehensive List of All Sites: Number, Lake/River, Name, Latitude, 

 Longitude, and State/Province -------------------------------------------------------------- 16

Table 5. Sites with the Greatest Number of Records ----------------------------------------------- 24

LIST OF FIGURES

Figure 1. Total Number of Sites per Winter-------------------------------------------------------------7

Figure 2. Average Number of Reports per Site, each site (plotted as a dot) is labelled

 by its site number -------------------------------------------------------------------------------7

Figure 3. Composite Date of First and Last NWS Ice Report ----------------------------------------8

Figure 4. Composite Chart of all Site Locations -------------------------------------------------------8
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Computerized National Weather Service Great Lakes Ice 

Reports for Winter Seasons 1899-1970

Raymond Assel

Abstract. Historical National Weather Service Great Lakes ice reports were digitized to provide a data set of ice thickness and ancillary ice information in the coastal 

zone of the Great Lakes for winter seasons from 1899 to 1970. These data are made available here for the first time in a computer compatible format. Temporal and spatial distribution patterns of ice report observations are discussed briefly.

INTRODUCTION

Because ice cover in the Great Lakes affects both the flora and fauna (Magnuson et al. 1997), retrospective ice cover information is useful for the construction of biological and physical models 

during the winter months, e.g., fishery recruitment, sediment re-suspension, and shore erosion. 

The presence or absence of a stable ice cover in shallow spawning grounds in northern Lake 

Michigan has been shown to affect whitefish recruitment (Brown et al. 1993). A stable ice cover 

can also contribute to increased under ice zooplankton activity (Vanderploeg et al. 1992) and 

to decreased resuspension of particulate matter in the water column (Schwab et al., submitted 

2004). Computerized ice thickness data along the shores of the Great Lakes prior to about 1965 

are extremely sparse. Historical NOAA National Weather Service (NWS) ice reports only existed 

in paper copy prior to this project. These reports are in text form and contain qualitative descriptions of ice conditions and quantitative information on ice thickness in specific nearshore areas of 

the Great Lakes. There are approximately 530 pages of reports spanning the winters from 1899 

to 1970. In this project, ice reports were computerized by creating computer image files of the 

original paper reports and by digitizing (keying) the ice thickness data for specific site locations. 

The objective was to make these coastal ice data more accessible for climate, winter ecosystem, 

and engineering design and feasibility studies. The shore zone ice thickness data also provide 

a complementary data set for several historical Great Lakes ice data sets (Assel 2003, Assel et 

al. 2002, Bolsenga 1988, Bolsenga et al. 1988, Slator 1978) and have potential applications in 

GLERL’s Great Lakes Coastal Forecasting System Project and the Lake Erie Integrated Program. 

A NOAA Climate Database Modernization Program (CDMP) proposal was funded to support 

this work. Funds were used to digitize the ice reports under a contract to Lason (Beltsville, Maryland). A majority of GLERL staff time to support this work was provided by internal GLERL 

funds. The work was coordinated by the National Climate Data Center (NCDC) under the auspices of the National Environmental Satellite, Data, and Information Service. GLERL made an 

index of the NWS ice report dates for each year and developed the format and codes used to 

digitize the ice thickness data. This was documented in a task order to the NCDC contractor. The 

National Snow and Ice Data Center (NSIDC) collaborated with GLERL to organize the data and 

provide it to the contractor (NSIDC archives the original paper reports). The NCDC contractor 

provided GLERL with computer files of digitized NWS ice reports, a list of station names, and 

graphic image files of the original NWS ice charts. Ice thickness reports are summarized in tables 

sorted by lake and date for each winter season and are also summarized in tables sorted by winter 
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season. Software to make tabular summaries and software to make graphs that portray the NWS 

ice report sites were developed at GLERL. The digitized ice thickness data and image files of 

the original NWS reports and digitized ice thickness data were quality controlled for consistency 

but not checked for possible key entry errors in the digitizing process as this would have been 

prohibitively costly in time and funds due to the large volume of data involved. The data in this 

report is being made available to the NSIDC for archiving. 

DATA

The following text from Snider, (1974), provides a historical context to the data that was digitized.

“In 1897, the Weather Bureau Office at Detroit begin routine weekly publication 

of available ice information during the late winter and early spring. Observations 

were mostly from ports and narrow channels, but occasionally a report from a 

captain who had made an early passage was included. Forecasters preparing this 

publication soon begin including the probable effect of the past week’s weather 

on the ice and hinting at the implications of the weather forecast for the next few 

days. Over a period of several decades, considerable skill was achieved in the 

subjective preparation of ice forecasts by meteorological methods. None of these 

methods were ever published, but shipping companies began using the Weather 

Bureau Ice Reports to time the outfitting of vessels and hiring of crews for their 

initial spring sailings.”

Thus, the historical NWS ice reports were used primarily by shippers to determine when it was 

safe to begin navigation on the Great Lakes in spring. 

The data abstracted and digitized from the historical paper copy NWS ice reports consisted of 

site name, lake or river, year, month, and day of report, ice thickness, ice condition, and a section of supplementary descriptive ice cover information. Ice condition codes are summarized in 

Table 1. An estimate of the latitude and longitude location of each site and a site number were 

added later. The digital data is summarized as two types of tabular listings: (1) all the reports for 

a given station over the 72 winters 1899-1970, and (2) all stations for a given winter season, see 

Table 2 and Table 3, respectively, for examples. Computer files of the tables are given as Appendix 1 and Appendix 2, respectively. File names, structure, and record format are also given in 

these appendices. The original paper copy reports were scanned and a graphic (Tag Image File 

Format, i.e.,TIF) image file was created of each of the original report pages (Appendix 3). The 

name of the image file was also included in the digitized ice report for each site. Thus, each digitized ice report record is cross referenced with its image file for those who may wish to examine 

the original data. 

SITE TEMPORAL DISTRIBUTION

There are 36,599 individual records covering 501 stations and 72 winters (1899-1970). The temporal distribution of these data is summarized as a computer file (Appendix 4), which contains a 

matrix of 501 rows by 72 columns. The number of observations (records) for each winter for a 

given station is given by reading across columns for a given row. The stations with records and 
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the number of records for each station with data for a given year are obtained by reading down a 

given column. Figure 1 portrays the total number of sites per winter season and Figure 2 portrays 

the average number of reports per site over the 72 winter seasons. It is evident from Figure 1 that 

the number of sites was between 100 and 200 for most of the period of record, falling below 100 

in the 1920s to early 1930s and above 200 sites from the mid 1940 to the mid 1960s. Figure 2

shows that less than 20% of the sites average more than 2 records per season. The upper 20% of 

the sites with the greatest number of records are summarized in order of ascending site number 

in Table 5. Figure 3 portrays the dates of first and last ice each winter. It shows that most seasons ice reports started in early March and ended any time between the end of the third week of 

March and the last week of April.

SITE LOCATIONS

No latitude and longitude coordinates were given in the original National Weather Service 

Reports. Latitude and longitude coordinates were estimated, from the site name, for each site 

location using Great Lakes Navigation Charts and geographic atlases. The latitude longitude 

coordinates given provide only a general location of each site. Readers interested in more specific location information should consult the images of the original NWS Ice Reports, Navigation 

Charts of the Great Lakes, and a place name Atlas. A comprehensive list of all sites, annotated by 

site number (No), Lake or River (L/R), Name, Latitude North (Lat. N) and Longitude West (Lon. 

W), and State or Province (S/P) is given as Table 4. The sites in Table 4 were first aggregated by 

lake or river and then arranged in order of decreasing latitude for a given lake or river. The approximate location of each site is portrayed in a series of charts given in Appendix 1. The location of all sites are portrayed in Figure 4. The location of all sites for a given winter is portrayed 

in a series of charts given in Appendix 2. 

One site name on each lake is simply the lake’s name or river name (e.g., site 22-Lake Superior, 

site 304-Lake Michigan, site 179-Lake Huron, site 384-Lake Erie, site 460-Lake Ontario, site 

359-Detroit River, site 353-St Clair River, site 105-St, Marys River, and site 498-St Lawrence 

River). Reports at these sites refer to a general description about the lake or river either with no 

specific location given or a location given in the supplemental information section of the record. 

These sites were included to have a complete a record as possible of reported ice conditions.

SITE ALIASES

Many of the latitude and longitude coordinates given in Table 4 are associated with two or more 

different site names. Reasons for this include: 

(1) over the years the same site has been known by several different names [e.g., Mackinac 

Island and Mackinaw Island; the Soo and Sault Ste Marie; Green Bay, Green Bay–Bay, and 

Green Bay Harbor], 

(2) several different descriptions (lakeward, bay, harbor, island, in side breakwater, outside 

breakwater, in the lake, and others) are given for the same geographic location (e.g. Duluth) 

in the original NWS Report [each descriptor was given a different site name], and 
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Figure 1. Total Number of Sites per Winter.

Figure 2. Average Number of Reports per Site.

Each ite (plotted as a dot) is labelled by its site number.
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Figure 4. Composite Chart of all Site Locations.

Figure 3. Composite Date of First and Last NWS Ice Report.
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(3) sites in the same proximity (Soo, Sault Ste Marie – Canadian Canal) exceeded the precision 

with which latitude and longitude were estimated and so were given the same latitude, longitude coordinate. Sites at different locations but with the same name, (e.g., Grand Marais, 

Michigan (Lake Superior) and Grand Marais, Minnesota (Lake Superior), Presque Isle (on 

Lakes Superior) and Presque Isle (on Huron), provided a further complicating factor for alias 

site names. 

Sites that have different site descriptors but the same latitude longitude coordinate could have 

been combined. The stations in Table 4 do contain some sites that are combinations of earlier 

individual sites. The Keweenaw Waterway, site 29, provides the best example of this, where ice 

reports all along this waterway were included under that one site name. However, this was not 

done in the vast majority of the sites in this report as the individual sites given here may be of 

interest to some users, and combining sites is at best a subjective process. Since sites are indexed 

by site number (Table 4) and are available as computer files (Appendix 1), it would not be difficult to combine sites. The choice to do so is left to the discretion of the users of these data.

SUMMARY

Ice thickness and ice condition data was digitized from historical National Weather Service ice 

reports for winters from 1899 to 1970. Over 36,500 records at 501 sites were produced and given 

as tabulations in fixed formatted ASCII files. An estimate of the approximate latitude and longitude location and a cross reference to the name of image files from which the data was abstracted 

is included in each record. The dates of first ice reports frequently start the first week of March, 

and the dates of last ice reports occur anytime between the end of the third week in March and 

last week in April. Thus, any analysis of these data will likely be limited primarily to the months 

of March and April. Average dates of maximum ice thickness occur 8-15 March (Lake Superior) 

24-28 February (Lakes Michigan and Huron), 16-23 February (Lake Ontario), and 1-7 February 

(Lake Erie), according to Bolsenga et al. (1988). Thus, these data are useful in estimating the 

seasonal maximum ice thickness in some areas of the Great Lakes.

REFERENCES

Assel, R.A. NOAA Atlas. An Electronic Atlas of Great Lakes Ice Cover, Winters: 1973-2002. 

Great Lakes Environmental Research Lab., Ann Arbor, MI (2003). http://www.glerl.noaa.gov/

data/ice/atlas/index.html

Assel, R.A., D.C. Norton, and K.C. Cronk. A Great Lakes Digital Ice Cover Data Base for Winters 1973-2000. NOAA TM ERL-GLERL-121, Great Lakes Environmental Research Laboratory, 

Ann Arbor, MI (2002). ftp://ftp.glerl.noaa.gov/publications/tech_reports/glerl-121/

Bolsenga, S.J. Nearshore Great Lakes ice cover. Cold Regions Science and Technology 15:99-

105 (1998). 

Bolsenga, S.J., G.M. Greene, and K.M. Hinkel. Nearshore Great Lakes ice statistics. NOAA 

TM ERL GLERL-69, Great Lakes Environmental Research Laboratory, Ann Arbor, MI (PB89-

100192/XAB) 42 pp. (1988). ftp://ftp.glerl.noaa.gov/publications/tech_reports/glerl-069/
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Brown, R., W. Taylor, and R.A. Assel. Factors affecting the recruitment of lake whitefish in two 

areas of northern Lake Michigan. Journal of Great Lakes Research 19:418-428 (1993).

Magnuson, J.J., K.E. Webster, R.A. Assel, C.J Bowser, P.J. Dillin, J.G. Eaton, H.E. Evans, E. J. 

Fee, R.I. Hall, L.R. Mortsch, D.W. Schindler, F.H. Quinn. Potential Effects of Climate Changes 

on Aquatic Systems: Laurentian Great Lakes and Precambrian Shield Region. Journal of Hydrological Processes 11:825-871 (1997).

Snider, C.R.. Great Lakes Ice Forecasting. NOAA Techncal Memorandum NWS OSD 1. [available from National Technical Information Service, Department of Commerce, 5285 Port Royal 

d., Springfield, VA 22121] (1974).

Schwab, D.J., B.J. Eadie, R.A. Assel, and P.J. Roebber. Climatology of Large Sediment Resuspension Events in Southern Lake Michigan. Journal of Great Lakes Research (submitted 2004).

Sleator, F.E. Ice thickness and stratigraphy at nearshore locations on the Great Lakes (English 

units). NOAA Data Report ERL GLERL-1-1, Great Lakes Environmental Research Laboratory, 

Ann Arbor, MI (PB-295-671/2GA) 434 pp. (1978).

Vanderploeg, H.A., S.J. Bolsenga, G.L. Fahnenstiel, J.R. Liebig, and W.S. Gardner. Plankton 

ecology in an ice-covered bay of Lake Michigan: Utilization of a winter phytoplankton bloom by 

reproducing copepods. Hydrobiologia 243-244: 175-183 (1992).
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Table 1 Ice Condition Codes*

Code Description 

BI Brash Ice, accumulation of floating ice made up of pieces less than 2 meters across

BK Ice Broken

BV Beyond Vision

CL Clear Ice, ice transparent in appearance

DC Decreasing

DI Drift Ice

FD Field Ice, an area of pack ice consisting of any size floes covering an area 10 km or more across

FS Fast Ice, ice that is attached to the shore

HF Heavy Field Ice, same as field ice but with a greater percent coverage or rafting or ridging

IB Icebergs, large ice floes

IJ Ice Jam, an accumulation of broken ice caught in a narrow channel or constricted area

IN Increasing

IP Ice Present

IR Ice Bridge, a arc shaped ice cover that can form at the outlet of a lake, due to high water velocity

LF Light Field Ice, same as field ice but with less percent coverage

LI Very Little Ice

NC No Change

NI New Ice, a general term for recently formed ice

NS Ice Not Safe

OW No Ice In Area, Open Water

PI Pack Ice, any area of ice other than fast ice, no matter what form it takes

PN Pancaked, circular pieces of ice from 30 cm to 3 m across, up to 10 cm thick, with raised rims

PR Pressure Ridges, a line or wall of broken ice forced up by pressure

RF Refrozen

RI Running Ice, ice moving with the current or wind

RT Rotten Ice, ice which has become honeycombed and is in an advanced state of disintegration

SC Snow Covered

SI Slush Ice, ice formed from snow saturated with water

SL Slush On Ice, snow saturated and mixed with water on the ice surface

SM Smooth Ice

SO Solid, ice that shows no signs of deterioration

SW Some Open Water

WI Windrowed, a hillock of broken ice which has been formed by the action of winds

WT Water On Ice

*These descriptions are taken directly from the NWS ice reports. The meaning of most of the descriptions are self-evident. A brief explanation is given for the remaining terms, based primarily on WMO 

Sea-Ice Nomenclature, 1970. World Meteorological Organization publication WMO/OMM/BMO - No. 

259. TP. 145.
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Table 2. Example of Individual Site Tabulation 

GREAT LAKES ENVIRONMENTAL RESEARCH LABORATORY, NOAA Climate Data Modernization Project

National Weather Service Historical Great Lakes Ice Reports for Winters 1899 - 1970

Site No. 001, Approximate Location: 48.90 N. Latitude, 88.00 W. Longitude

Site Name Nipigon Bay on Lake Superior

Year Mo Da T1 T2 C1 T1C2 T2C1 C2 T1C2 T2C2 C3 T1C3 T2C3 IMAGE Supplemental 

Information*

1953 2 24 12 -1 -1 -1 -1 -1 -1 -1 375.tif

Rossport 

Harbor: To 

1/2 mi out

1953 2 24 -1 -1 OW -1 -1 -1 -1 -1 -1 375.tif Rossport: 

Lake

1962 4 23 -1 -1 SO -1 -1 -1 -1 -1 -1 455.tif

1966 3 14 -1 -1 HF -1 -1 SO -1 -1 -1 -1 485.tif

1966 3 21 -1 -1 SO -1 -1 -1 -1 -1 -1 486.tif

1967 4 17 -1 -1 SO -1 -1 -1 -1 -1 -1 496.tif

Ice thickness is in inches, -1 = no thickness reported, see report Table 1 for ice conditon codes.

T1 = ice thickness or part of a range if T2 is present, C1 = primary condtion of ice.

T1C1 = thickness of C1 or part of range if T2C1 is presnet.

C2, T1C2, T2C2, C3, T1C3, T2C3 are secondary and ternary ice conditon and condition thickness.

*Often there will be additional descriptive information on ice conditions at a site. This information is not 

given in the ice condition sections of the report.
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Site # Year MO DA T1 T2 C1 T1C1 T2C1 C2 T1C2 T2C2 C3 T1C3 T2C3 Image Supplemental Information

25 1899 4 21 -1 -1 RT -1 -1 SW -1 -1 -1 -1 002.TIF HARBOR

25 1899 4 21 -1 -1 RT -1 -1 SW -1 -1 -1 -1 002.TIF BAY

33 1899 4 22 -1 -1 BK -1 -1 -1 -1 -1 -1 002.TIF HARBOR44 1899 4 8 30 34 SO -1 -1 -1 -1 -1 -1 529.TIF BAY

44 1899 4 8 30 34 SO -1 -1 -1 -1 -1 -1 529.TIF CHANNEL

44 1899 4 8 -1 -1 SO -1 -1 -1 -1 -1 -1 529.TIF LAKE

44 1899 4 15 -1 -1 BK -1 -1 RT -1 -1 -1 -1 001.TIF

44 1899 4 22 -1 -1 RT -1 -1 NS -1 -1 -1 -1 002.TIF

50 1899 4 16 -1 -1 DI -1 -1 BK -1 -1 -1 -1 001.TIF

51 1899 4 23 12 -1 DI -1 -1 BV -1 -1 -1 -1 002.TIF LAKE

52 1899 4 16 -1 -1 OW -1 -1 -1 -1 -1 -1 001.TIF52 1899 4 23 -1 -1 BK -1 -1 RT -1 -1 DI -1 -1 002.TIF (25% ICE COVER)

58 1899 4 11 -1 -1 HF -1 -1 DI -1 -1 -1 -1 529.TIF ABOVE THE POINT71 1899 4 11 24 -1 -1 -1 -1 -1 -1 -1 529.TIF

71 1899 4 16 -1 -1 RT -1 -1 NS -1 -1 -1 -1 001.TIF

71 1899 4 23 -1 -1 DI -1 -1 RT -1 -1 -1 -1 002.TIF

74 1899 4 22 -1 -1 NC -1 -1 -1 -1 -1 -1 002.TIF76 1899 4 15 -1 -1 SO -1 -1 -1 -1 -1 -1 001.TIF76 1899 4 22 -1 -1 IP -1 -1 RT -1 -1 -1 -1 002.TIF

77 1899 4 22 -1 -1 RT -1 -1 -1 -1 -1 -1 002.TIF BAY77 1899 4 22 -1 -1 FD -1 -1 BV -1 -1 -1 -1 002.TIF LAKE

81 1899 4 23 -1 -1 SW -1 -1 -1 -1 -1 -1 002.TIF

87 1899 4 11 16 34 RT -1 -1 -1 -1 -1 -1 529.TIF

87 1899 4 25 -1 -1 LI -1 -1 -1 -1 -1 -1 002.TIF WHITEFISH TO ENCAMPMENT

91 1899 4 17 -1 -1 RT -1 -1 NS -1 -1 -1 -1 001.TIF

108 1899 4 17 15 -1 -1 -1 -1 -1 -1 -1 001.TIF LOWER END

108 1899 4 25 -1 -1 BK -1 -1 -1 -1 -1 -1 002.TIF

110 1899 4 17 22 -1 CL -1 -1 -1 -1 -1 -1 001.TIF

138 1899 4 17 -1 -1 NC -1 -1 RF -1 -1 -1 -1 001.TIF

Table 3. Example of Individual Winter Season Aggregated Site Tabulation. GREAT LAKES ENVIRONMENTAL RESEARCH LABORATORY, NOAA Climate Data Modernization ProjectNational Weather Service Historical Great Lakes Ice Reports - Winter 1899

Ice thickness is in inches, -1 = no thickness reported, see report Table 1 for ice conditon codes.T1 = ice thickness or part of a range if T2 is present, C1 = primary condtion of ice.T1C1 = thickness of C1 or part of range if T2C1 is presnet.C2, T1C2, T2C2, C3, T1C3, T2C3 are secondary and ternary ice conditon and condition thickness.
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Table 3. Example of Individual Winter Season Aggregated Site Tabulation (continued).

Site # Year MO DA T1 T2 C1 T1C1 T2C1 C2 T1C2 T2C2 C3 T1C3 T2C3 Image Supplemental Information

150 1899 4 18 -1 -1 LF -1 -1 DI -1 -1 -1 -1 001.TIF151 1899 4 18 -1 -1 OW -1 -1 -1 -1 -1 -1 001.TIF ALPENA

154 1899 4 11 -1 -1 IP -1 -1 BV -1 -1 -1 -1 529.TIF

154 1899 4 18 -1 -1 OW -1 -1 -1 -1 -1 -1 001.TIF

155 1899 4 11 -1 -1 OW -1 -1 -1 -1 -1 -1 529.TIF TO THE EAST OF ISLAND

159 1899 4 11 -1 -1 RT -1 -1 -1 -1 -1 -1 529.TIF181 1899 4 13 -1 -1 RT -1 -1 -1 -1 -1 -1 001.TIF TO 1/4Mi OUT181 1899 4 13 -1 -1 OW -1 -1 -1 -1 -1 -1 001.TIF BEYOND 1/4Mi OUT

183 1899 4 15 -1 -1 RT -1 -1 SW -1 -1 -1 -1 001.TIF BAY

214 1899 4 11 -1 -1 HF -1 -1 -1 -1 -1 -1 529.TIF214 1899 4 17 -1 -1 FD -1 -1 BV -1 -1 -1 -1 001.TIF

224 1899 4 23 4 8 RT -1 -1 -1 -1 -1 -1 002.TIF228 1899 4 -1 -1 SO -1 -1 RT -1 -1 -1 -1 529.TIF

228 1899 4 11 36 48 -1 -1 -1 -1 -1 -1 529.TIF

231 1899 4 11 -1 -1 RT -1 -1 -1 -1 -1 -1 529.TIF 231 1899 4 18 -1 -1 NC -1 -1 SW -1 -1 -1 -1 001.TIF

231 1899 4 25 -1 -1 BK -1 -1 RT -1 -1 -1 -1 002.TIF237 1899 4 18 18 -1 RT -1 -1 WT -1 -1 -1 -1 001.TIF

238 1899 4 23 -1 -1 BK -1 -1 -1 -1 -1 -1 002.TIF262 1899 4 11 24 30 SO -1 -1 -1 -1 -1 -1 529.TIF

262 1899 4 13 -1 -1 SO -1 -1 -1 -1 -1 -1 001.TIF ALONG SHORE

262 1899 4 13 -1 -1 IP -1 -1 -1 -1 -1 -1 001.TIF 2Mi OUT272 1899 4 8 18 -1 -1 -1 -1 -1 -1 -1 529.TIF

282 1899 4 15 -1 -1 OW -1 -1 -1 -1 -1 -1 001.TIF UPPER BAY: TO 4Mi OUT

293 1899 4 15 -1 -1 SO -1 -1 -1 -1 -1 -1 001.TIF EXCEPT AROUND SHOALS & ISLANDS

324 1899 4 8 -1 -1 OW -1 -1 -1 -1 -1 -1 529.TIF RIVER

324 1899 4 8 -1 -1 DI -1 -1 RT -1 -1 -1 -1 529.TIF LAKE

325 1899 4 8 -1 -1 OW -1 -1 -1 -1 -1 -1 529.TIF

Ice thickness is in inches, -1 = no thickness reported, see report Table 1 for ice conditon codes.T1 = ice thickness or part of a range if T2 is present, C1 = primary condtion of ice.T1C1 = thickness of C1 or part of range if T2C1 is presnet.C2, T1C2, T2C2, C3, T1C3, T2C3 are secondary and ternary ice conditon and condition thickness.
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Site # Year MO DA T1 T2 C1 T1C1 T2C1 C2 T1C2 T2C2 C3 T1C3 T2C3 Image Supplemental Information

347 1899 4 11 -1 -1 DI -1 -1 -1 -1 -1 -1 529.TIF LAKE348 1899 4 11 -1 -1 OW -1 -1 -1 -1 -1 -1 529.TIF

351 1899 4 11 -1 -1 HF -1 -1 RI -1 -1 -1 -1 529.TIF

353 1899 4 17 -1 -1 OW -1 -1 -1 -1 -1 -1 001.TIF

368 1899 4 11 -1 -1 HF -1 -1 BK -1 -1 BV -1 -1 529.TIF EXCEPT IN CHANNEL

368 1899 4 17 -1 -1 BK -1 -1 RT -1 -1 -1 -1 001.TIF OUTSIDE THE BW368 1899 4 24 -1 -1 BK -1 -1 RT -1 -1 -1 -1 002.TIF386 1899 4 9 5 10 FD -1 -1 -1 -1 -1 -1 529.TIF LAKE

386 1899 4 15 -1 -1 RT -1 -1 -1 -1 -1 -1 001.TIF386 1899 4 22 -1 -1 LI -1 -1 -1 -1 -1 -1 002.TIF

391 1899 4 14 -1 -1 OW -1 -1 -1 -1 -1 -1 001.TIF

392 1899 4 8 -1 -1 WI -1 -1 RT -1 -1 -1 -1 529.TIF LAKE392 1899 4 14 -1 -1 IP -1 -1 -1 -1 -1 -1 001.TIF LAKE399 1899 4 7 -1 -1 OW -1 -1 -1 -1 -1 -1 529.TIF

400 1899 4 7 -1 -1 HF -1 -1 DI -1 -1 -1 -1 529.TIF LAKE413 1899 4 11 -1 -1 OW -1 -1 -1 -1 -1 -1 529.TIF

420 1899 4 8 -1 -1 OW -1 -1 -1 -1 -1 -1 529.TIF

421 1899 4 8 -1 -1 HF -1 -1 DI -1 -1 -1 -1 529.TIF LAKE424 1899 4 10 -1 -1 OW -1 -1 -1 -1 -1 -1 529.TIF LAKE

435 1899 4 8 -1 -1 BK -1 -1 RT -1 -1 -1 -1 529.TIF CHANNEL435 1899 4 8 -1 -1 SO -1 -1 BV -1 -1 -1 -1 529.TIF TIBBETS POINT LIGHT

435 1899 4 8 -1 -1 OW -1 -1 -1 -1 -1 -1 529.TIF BELOW CLAYTON

435 1899 4 22 -1 -1 HF -1 -1 -1 -1 -1 -1 002.TIF FOOT OF LAKE436 1899 4 18 -1 -1 SO -1 -1 -1 -1 -1 -1 001.TIF FOOT OF LAKE

462 1899 4 9 -1 -1 OW -1 -1 -1 -1 -1 -1 529.TIF

463 1899 4 9 -1 -1 OW -1 -1 -1 -1 -1 -1 529.TIF LAKE

498 1899 4 18 -1 -1 SO -1 -1 -1 -1 -1 -1 001.TIF HEAD OF RIVER

498 1899 4 22 -1 -1 RI -1 -1 -1 -1 -1 -1 002.TIF

Ice thickness is in inches, -1 = no thickness reported, see report Table 1 for ice conditon codes.T1 = ice thickness or part of a range if T2 is present, C1 = primary condtion of ice.T1C1 = thickness of C1 or part of range if T2C1 is presnet.C2, T1C2, T2C2, C3, T1C3, T2C3 are secondary and ternary ice conditon and condition thickness.

Table 3. Example of Individual Winter Season Aggregated Site Tabulation (continued).
16

 Table 4. Comprehensive List of All Sites: Number, Lake/River Name, Latitude, Longitude, and State/

Province.

NO Lake Name Lat. Lon. S/P

1 SUP Nipigon Bay 48.90 88.00 ON

2 SUP Peninsula Harbor 48.75 86.39 ON

3 SUP Marathon Harbor 48.75 86.39 ON

4 SUP Black Bay 48.70 88.40 ON

5 SUP Lakehead 48.43 89.25 ON

6 SUP Port Arthur 48.43 89.25 ON

7 SUP Port Arthur Out 

of BW

48.42 89.15 ON

8 SUP Port Arthur Harbor 48.42 89.25 ON

9 SUP Port Arthur In BW 48.42 89.25 ON

10 SUP Fort William 

Harbor

48.33 89.24 ON

11 SUP Kam River 48.33 89.23 ON

12 SUP Fort William 48.33 89.24 ON

13 SUP Thunder Bay Harbor, Ont.48.33 89.22 ON

14 SUP Thunder Bay, Ont. 48.33 89.22 ON

15 SUP Thunder Cape 48.32 88.95 ON

16 SUP Pie Island 48.25 89.08 ON

17 SUP Welcome Island 48.23 89.30 ON

18 SUP Victoria Island 48.13 89.37 ON

19 SUP Isle Royale 48.00 89.00 MN

20 SUP Michipicoten 

Harbor

47.95 84.88 ON

21 SUP Michipicoten 47.95 84.88 ON

22 SUP Lake Superior 47.75 87.75 MI

23 SUP Grand Marais 

Harbor, MN

47.75 90.34 MN

24 SUP Grand Marais, MN 47.75 90.34 MN

25 SUP Eagle Harbor 47.45 88.15 MI

26 SUP Keweenaw Point 47.40 87.70 MI

27 SUP Keweenaw 47.40 87.70 MI

28 SUP Beaver Bay 47.26 91.36 MI

29 SUP Keweenaw 

Waterway

47.22 88.62 MI

30 SUP Ship Canal 47.22 88.62 MI

31 SUP Split Rock 47.20 91.38 MN

32 SUP Stannard Rock 47.18 87.22 MI

33 SUP Two Harbors 47.01 91.68 MN

NO Lake Name Lat. Lon. S/P

34 SUP Sand Island 46.98 90.95 WI

35 SUP Apostle Islands 46.94 90.65 WI

36 SUP Raspberry Island 46.94 90.82 WI

37 SUP Ontonagon Harbor 46.87 89.31 MI

38 SUP Ontonagon 46.87 89.31 MI

39 SUP Keweenaw Harbor 46.87 88.42 MI

40 SUP Keweenaw Bay 46.86 88.42 MI

41 SUP Pequaming Harbor46.85 88.40 MI

42 SUP Pequaming 46.85 88.40 MI

43 SUP Madeline Island 46.82 90.69 WI

44 SUP Bayfield 46.81 90.82 WI

45 SUP Bayfield Harbor 46.81 90.82 WI

46 SUP Baraga 46.78 88.49 MI

47 SUP Sand Point Light 

Harbor

46.78 88.47 WI

48 SUP Sand Point Harbor 46.78 88.47 WI

49 SUP Sand Point Light 46.78 88.47 WI

50 SUP Minnesota Point 46.76 92.08 MN

51 SUP Duluth 46.76 92.09 MN

52 SUP Duluth Harbor 46.76 92.09 MN

53 SUP Superior 46.75 92.09 WI

54 SUP Superior Harbor 46.75 92.09 WI

55 SUP Superior Bay 46.75 92.09 WI

56 SUP St. Louis Bay 46.75 92.12 MN

57 SUP Whitefish Point 

Harbor

46.75 84.87 MI

58 SUP Whitefish Point 46.75 84.88 MI

59 SUP St. Louis River 46.74 92.14 MN

60 SUP Sable Point 46.72 86.14 MI

61 SUP Allouez 46.69 92.00 WI

62 SUP Allouez Harbor 46.69 92.00 WI

63 SUP Deer Park 46.67 85.63 MI

64 SUP Washburn Harbor 46.67 90.89 WI

65 SUP Washburn 46.67 90.89 WI

66 SUP Grand Marais, MI 46.67 85.99 MI

67 SUP Grand Marais 

Harbor, MI

46.67 85.98 MI
17

NO Lake Name Lat. Lon. S/P

68 SUP Chequamegon 

Bay Harbor

46.65 90.85 WI

69 SUP Chequamegon 

Bay

46.65 90.85 WI

70 SUP Ile Parisienne 46.65 84.64 ON

71 SUP Whitefish Bay 46.64 84.81 MI

72 SUP Presque Isle Harbor (SUP)46.59 87.38 MI

73 SUP Presque Isle (SUP) 46.59 87.38 MI

74 SUP Ashland 46.58 90.87 WI

75 SUP Ashland Harbor 46.58 90.87 WI

76 SUP Marquette Harbor 46.53 87.37 MI

77 SUP Marquette 46.53 87.38 MI

78 SUP Grand Island 46.52 86.67 MI

79 SUP Shelter Bay 46.50 86.74 MI

80 SUP Sault Ste. Marie 

Harbor

46.49 84.34 MI

81 SUP Iroquois Point 46.47 84.60 MI

82 SUP Au Train Bay 46.45 86.85 MI

83 SUP Munising 46.42 86.64 MI

84 SUP Munising Harbor 46.41 86.64 MI

85 STM Gros Cap Reef 46.53 84.58 ON

86 STM Soo Harbor 46.50 84.35 MI

87 STM Sault Ste. Marie 46.50 84.35 MI

88 STM Big Point 46.49 84.42 MI

89 STM Soo Locks 46.48 84.37 MI

90 STM St. Marys R. - Canadian Canal46.48 84.37 ON

91 STM Hay Lake 46.47 84.15 MI

92 STM Frechette 46.46 84.28 ON

93 STM Round Island 

(STM)

46.44 84.51 MI

94 STM Six Mile Point 46.43 84.26 MI

95 STM Brush Point 46.43 84.46 MI

96 STM Point Louise 46.43 84.46 MI

97 STM Point Aux Pins 46.43 84.46 ON

98 STM Waiska Bay 46.42 84.59 MI

99 STM Nine Mile Point, 

MI

46.39 84.23 MI

MO Lake Name Lat. Lon. S/P

100 STM Lake Nicolet 46.37 84.21 MI

101 STM St. Marys River - 

Neebish

46.28 84.16 MI

102 STM Rock Cut 46.28 84.16 MI

103 STM Little Rapids Cut 46.28 84.16 MI

104 STM Sawmill Point 46.25 84.23 MI

105 STM St. Marys River 46.25 84.00 MI

106 STM Moon Island 46.22 84.17 MI

107 STM Lake Munuscong 46.20 84.21 MI

108 STM Mud Lake 46.20 84.17 MI

109 STM Birch Point 46.18 84.15 MI

110 STM Lime Island 46.09 83.98 MI

111 STM Sweets Point 46.03 83.94 MI

112 STM Pipe Island 46.02 83.90 MI

113 STM Watsons Reef 46.01 83.90 MI

114 STM Detour 46.01 83.86 MI

115 STM Detour Harbor 46.00 83.86 MI

116 HUR Blind River 46.19 82.98 ON

117 HUR Blind River Harbor 46.19 82.98 ON

118 HUR North Channel - 

Georgian Bay

46.02 83.00 ON

119 HUR Little Current 46.00 82.00 ON

120 HUR Little Current 

Harbor

45.99 81.99 ON

121 HUR Killarney 45.99 81.50 ON

122 HUR Killarney Harbor 45.99 81.49 ON

123 HUR Gore Bay Harbor 45.92 82.60 ON

124 HUR Gore Bay 45.92 82.60 ON

125 HUR St. Ignace 45.87 84.73 MI

126 HUR St. Ignace Harbor 45.86 84.72 MI

127 HUR Mackinac Island 45.85 84.62 MI

128 HUR Mackinac Island 

Harbor

45.84 84.61 MI

129 HUR Round Island 

(HUR)

45.83 84.60 MI

130 HUR Bois Blanc Island 45.77 84.44 MI

131 HUR Spectacle Reef 45.77 84.14 MI

132 HUR Byng Inlet 45.70 80.61 ON

Table 4. Comprehensive List of All Sites: Number, Lake/River Name, Latitude, Longitude, and State/

Province (continued).
18

NO Lake Name Lat. Lon. S/P

133 HUR Gereaux 45.70 80.62 ON

134 HUR Britt Sound 45.70 80.62 ON

135 HUR Britt Harbor 45.70 80.62 ON

136 HUR Poes Reef 45.69 84.36 MI

137 HUR Cheboygan Harbor45.66 84.43 MI

138 HUR Cheboygan 45.66 84.43 MI

139 HUR Georgian Bay 45.50 81.00 ON

140 HUR Rogers City 45.42 83.81 MI

141 HUR Calcite Harbor 45.41 83.79 MI

142 HUR Parry Sound 45.36 80.06 ON

143 HUR Parry Sound 

Harbor

45.36 80.06 ON

144 HUR North Bay 45.35 83.51 MI

145 HUR Presque Isle Light 45.33 83.48 MI

146 HUR Presque Isle 45.33 83.48 MI

147 HUR Tobermory 45.27 81.66 ON

148 HUR Tobermory Harbor 45.27 81.66 ON

149 HUR Middle Island 

Harbor

45.19 83.32 MI

150 HUR Middle Island 45.19 83.33 MI

151 HUR Thunder Bay 

River, MI

45.06 83.42 MI

152 HUR Alpena 45.05 83.30 MI

153 HUR Alpena Harbor 45.05 83.30 MI

154 HUR Alpena - Thunder 

Bay

45.05 83.30 MI

155 HUR Thunder Bay 

Island, MI

45.05 83.30 MI

156 HUR Thunder Bay Island Harbor, MI45.05 83.43 MI

157 HUR Thunder Bay, MI 45.03 83.33 MI

158 HUR Thunder Bay Harbor, MI45.03 83.33 MI

159 HUR Alpena Island (to 

Mainland)

45.01 83.46 MI

160 HUR Bruce Peninsula 45.00 81.30 ON

161 HUR Cape Croker 

Harbor

44.94 81.05 ON

MO Lake Name Lat. Lon. S/P

162 HUR Giants Tomb 44.90 80.00 ON

163 HUR Hope Island 44.77 80.16 ON

164 HUR Wiarton Harbor 44.76 81.13 ON

165 HUR Wiarton 44.76 81.13 ON

166 HUR Port McNicoll 44.75 79.81 ON

167 HUR Port McNicoll 

Harbor

44.75 79.81 ON

168 HUR Midland 44.75 79.90 ON

169 HUR Midland Harbor 44.75 79.90 ON

170 HUR Nottawasaga Bay 44.65 80.15 ON

171 HUR Owen Sound 

Harbor

44.60 80.93 ON

172 HUR Owen Sound 44.60 80.93 ON

173 HUR Saugeen Harbor 44.55 81.40 ON

174 HUR Saugeen 44.55 81.40 ON

175 HUR Southampton 44.50 81.40 ON

176 HUR Southampton 

Harbor

44.50 81.45 ON

177 HUR Collingwood 

Harbor

44.500 80.24 ON

178 HUR Collingwood 44.50 80.24 ON

179 HUR Lake Huron 44.50 82.50 MI

180 HUR Chantry Island 44.48 81.40 ON

181 HUR Oscoda 44.41 83.33 MI

182 HUR Oscoda Harbor 44.41 83.33 MI

183 HUR East Tawas 44.26 83.44 MI

184 HUR Tawas Point 44.26 83.44 MI

185 HUR Tawas Bay Harbor 44.26 83.44 MI

186 HUR East Tawas Harbor 44.26 83.44 MI

187 HUR Tawas Point 

Harbor

44.26 83.44 MI

188 HUR Tawas Bay 44.26 83.44 MI

189 HUR Tawas City Harbor 44.25 83.45 MI

190 HUR Point aux Barques 

Harbor

44.10 83.00 MI

191 HUR Point aux Barques 44.10 83.00 MI

192 HUR Point Clark 44.09 81.75 ON

193 HUR Port Austin Harbor 44.05 82.99 MI

194 HUR Port Austin 44.05 82.99 MI

Table 4. Comprehensive List of All Sites: Number, Lake/River Name, Latitude, Longitude, and State/

Province (continued).
19

NO Lake Name Lat. Lon. S/P

195 HUR Charity Island 44.03 83.44 MI

196 HUR Gravelly Shoal 44.02 83.57 MI

197 HUR Point Au Gres 44.00 83.87 MI

198 HUR Harbor Beach 43.86 82.65 MI

199 HUR Harbor Beach 

Harbor

43.85 82.65 MI

200 HUR Goderich 43.78 81.72 ON

201 HUR Goderich Harbor 43.78 81.72 ON

202 HUR Bay City 43.64 83.85 MI

203 HUR Bay City Harbor 43.64 83.85 MI

204 HUR Bay City - 

Saginaw Bay

43.64 83.85 MI

205 HUR Saginaw Bay 43.63 83.84 MI

206 HUR Saginaw Harbor 43.63 83.84 MI

207 HUR Saginaw River 43.62 83.84 MI

208 HUR Port Sanilac 43.43 82.54 MI

209 HUR Port Sanilac 

Harbor

43.43 82.54 MI

210 HUR Port Huron - Black 

River

43.01 82.45 MI

211 HUR Port Huron Harbor 42.99 82.43 MI

212 HUR Lake View Beach 42.99 82.43 MI

213 HUR Lake View 42.99 82.43 MI

214 HUR Port Huron 42.99 82.43 MI

215 MIC Port Inland Harbor 45.97 85.87 MI

216 MIC Port Inland 45.97 85.87 MI

217 MIC Manistique 45.96 86.25 MI

218 MIC Manistique Harbor 45.96 86.25 MI

219 MIC Seul Choix Point 45.92 85.91 MI

220 MIC Lansing Shoal 45.90 85.56 MI

221 MIC Kipling 45.87 87.01 MI

222 MIC St. Helena Island 45.86 84.87 MI

223 MIC Gladstone Harbor 45.85 87.02 MI

224 MIC Gladstone 45.85 87.02 MI

225 MIC White Shoal 45.84 85.11 MI

226 MIC Squaw Island 45.84 85.59 MI

227 MIC Whiskey Island 45.81 85.61 MI

MO Lake Name Lat. Lon. S/P

228 MIC Straits of Mackinac

45.81 84.72 MI

229 MIC Garden Island 45.80 85.49 MI

230 MIC Hog Island 45.79 85.36 MI

231 MIC Mackinaw City 45.78 84.72 MI

232 MIC Grays Reef 45.77 85.18 MI

233 MIC Trout Island 45.77 85.69 MI

234 MIC Waugoschance 45.76 85.01 MI

235 MIC Big Bay De Noc 45.75 86.71 MI

236 MIC Little Bay De Noc 45.75 87.04 MI

237 MIC Escanaba 45.75 87.04 MI

238 MIC Escanaba Harbor 45.74 87.03 MI

239 MIC High Island 45.74 85.65 MI

240 MIC Isle Aux Galets 45.68 85.39 MI

241 MIC Ford River 45.68 87.15 MI

242 MIC St. James 45.66 85.56 MI

243 MIC St. James Harbor 45.66 85.56 MI

244 MIC Beaver Island 

Harbor

45.66 85.56 MI

245 MIC Beaver Island 45.66 85.56 MI

246 MIC Cross Village 45.64 85.04 MI

247 MIC Minneapolis 

Shoals Light

45.58 87.00 MI

248 MIC St. Martins Island 45.50 86.77 MI

249 MIC Harbor Springs 

Harbor

45.43 84.99 MI

250 MIC Harbor Springs 45.43 84.99 MI

251 MIC Rock Island 45.42 86.82 MI

252 MIC Fox Islands 45.42 85.8 MI

253 MIC Cedar River 45.41 87.35 MI

254 MIC Little Traverse Bay 45.40 85.00 MI

255 MIC Jackson Harbor 45.40 86.85 MI

256 MIC Washington Island 45.38 86.90 MI

257 MIC Petosky 45.37 84.96 MI

258 MIC Detroit Island 

Harbor

45.36 86.93 MI

259 MIC Plum Island 

Harbor

45.31 86.95 WI

260 MIC Plum Island 45.31 86.95 WI

Table 4. Comprehensive List of All Sites: Number, Lake/River Name, Latitude, Longitude, and State/

Province (continued).
20

NO Lake Name Lat. Lon. S/P

261 MIC Charlevoix Harbor 45.30 85.25 MI

262 MIC Charlevoix 45.30 85.25 MI

263 MIC Porte des Morts 

Passage

45.29 86.96 MI

264 MIC Charlevoix - Pine 

Lake

45.27 85.13 MI

265 MIC Lake Charlevoix 45.27 85.13 MI

266 MIC Chambers Island 45.18 87.36 MI

267 MIC Northport 45.12 85.60 MI

268 MIC Northport Harbor 45.12 85.60 MI

269 MIC Menominee River 45.11 87.60 MI

270 MIC North Manitou 

Island

45.11 86.02 MI

271 MIC Menominee 45.11 87.60 MI

272 MIC Menominee 

Harbor

45.10 87.60 MI

273 MIC Leland Harbor 45.02 85.76 MI

274 MIC South Manitou 

Island Harbor

45.00 86.12 MI

275 MIC South Manitou 

Island

45.00 86.12 MI

276 MIC Manitou Passage 45.00 86.00 MI

277 MIC Peshtigo 44.95 87.63 WI

278 MIC Sleeping Bear 

Point

44.91 86.04 MI

279 MIC Glen Haven 44.90 86.03 MI

280 MIC Glen Haven 

Harbor

44.90 86.03 MI

281 MIC Sherwood Point 44.89 87.43 WI

282 MIC Sturgeon Bay 44.81 87.32 WI

283 MIC Sturgeon Bay 

Canal

44.81 87.32 WI

284 MIC Sturgeon Bay 

Harbor

44.81 87.32 WI

285 MIC Grand Traverse 

Bay

44.79 85.68 MI

286 MIC Traverse City 

Harbor

44.79 85.68 MI

287 MIC Traverse City 44.79 85.68 MI

288 MIC Traverse Bay 44.79 85.68 MI

MO Lake Name Lat. Lon. S/P

289 MIC Frankfort 44.62 86.21 MI

290 MIC Frankfort Harbor 44.62 86.21 MI

291 MIC Fox River 44.54 88.00 MI

292 MIC Green Bay 44.50 88.02 WI

293 MIC Green Bay - Bay 44.50 88.02 WI

294 MIC Green Bay Harbor 44.50 88.02 WI

295 MIC Kewaunee Harbor 44.46 87.50 WI

296 MIC Kewaunee 44.46 87.50 WI

297 MIC Manistee - Little 

Lake

44.24 86.32 MI

298 MIC Manistee 44.24 86.32 MI

299 MIC Manistee Harbor 44.24 86.32 MI

300 MIC Two Rivers Harbor 44.15 87.57 WI

301 MIC Two Rivers 44.15 87.57 WI

302 MIC Manitowoc Harbor 44.09 87.65 WI

303 MIC Manitowoc 44.09 87.65 WI

304 MIC Lake Michigan 44.00 87.00 MI

305 MIC Pere Marquette 

Lake

43.96 86.45 MI

306 MIC Ludington 43.96 86.45 MI

307 MIC Ludington Harbor 43.96 86.45 MI

308 MIC Pentwater 43.78 86.43 MI

309 MIC Pentwater Harbor 43.78 86.43 MI

310 MIC Sheboygan 43.75 87.71 WI

311 MIC Sheboygan Harbor43.75 87.71 WI

312 MIC Montague 43.42 86.36 MI

313 MIC Montague Harbor 43.42 86.36 MI

314 MIC Whitehall Harbor 43.41 86.35 MI

315 MIC Port Washington 43.39 87.88 WI

316 MIC Port Washington 

Harbor

43.39 87.88 WI

317 MIC White Lake 43.38 86.38 MI

318 MIC White Lake Harbor 43.38 86.38 MI

319 MIC Lake Muskegon 43.24 86.28 MI

320 MIC Muskegon Harbor 43.23 86.25 MI

321 MIC Muskegon 43.23 86.25 MI

322 MIC Grand Haven 43.06 86.23 MI

Table 4. Comprehensive List of All Sites: Number, Lake/River Name, Latitude, Longitude, and State/

Province (continued).
21

NO Lake Name Lat. Lon. S/P

323 MIC Grand Haven 

Harbor

43.06 86.23 MI

324 MIC Milwaukee 43.02 87.89 WI

325 MIC Milwaukee Harbor 43.02 87.89 WI

326 MIC Holland - Black 

Lake

42.78 86.11 MI

327 MIC Holland Harbor 42.78 86.11 MI

328 MIC Holland 42.78 86.11 MI

329 MIC Lake Macatawa 42.78 86.16 MI

330 MIC Macatawa 42.77 86.20 MI

331 MIC Racine 42.74 87.78 WI

332 MIC Racine Harbor 42.74 87.78 WI

333 MIC Saugatuck 42.65 86.20 MI

334 MIC Saugatuck Harbor 42.65 86.20 MI

335 MIC Kenosha 42.58 87.82 WI

336 MIC Kenosha Harbor 42.58 87.82 WI

337 MIC South Haven 

Harbor

42.40 86.28 MI

338 MIC South Haven 42.40 86.28 MI

339 MIC Waukegan Harbor 42.36 87.82 IL

340 MIC Waukegan 42.36 87.82 IL

341 MIC St. Joseph Harbor 42.11 86.48 MI

342 MIC St. Joseph 42.11 86.48 MI

343 MIC Wilmette Harbor 42.07 87.72 IL

344 MIC Chicago Harbor 41.88 87.61 IL

345 MIC Chicago 41.88 87.61 IL

346 MIC Calumet Harbor 41.73 87.52 IN

347 MIC Michigan City 41.71 86.89 IN

348 MIC Michigan City 

Harbor

41.71 86.89 IN

349 MIC Indiana Harbor 41.65 87.47 IN

350 MIC Gary 41.63 87.32 IN

351 STC St. Clair River - 

Port Huron

42.99 82.43 MI

352 STC Sarnia Harbor 42.96 82.42 ON

353 STC St. Clair River 42.91 82.49 MI

354 STC Marysville 42.90 82.48 MI

355 STC Marysville Harbor 42.90 82.48 MI

MO Lake Name Lat. Lon. S/P

356 STC Algonac 42.70 82.60 MI

357 LSC Lake St. Clair 42.50 82.60 MI

358 DTR Detroit Harbor 42.35 82.97 MI

359 DTR Detroit River 42.21 83.10 MI

360 DTR Amherstburg 42.10 83.11 ON

361 DTR Amherstburg 

Harbor

42.10 83.11 ON

362 ERI Port Colborne 

Harbor

42.90 79.26 ON

363 ERI Port Colborne 42.90 79.26 ON

364 ERI Welland Canal 42.90 79.26 ON

365 ERI Waverly Shoal 42.88 78.94 ON

366 ERI Port Maitland 42.87 79.58 ON

367 ERI Buffalo - Niagara 

River

42.85 78.87 NY

368 ERI Buffalo 42.85 78.87 NY

369 ERI Buffalo Harbor 42.85 78.87 NY

370 ERI Point Abino 42.84 79.08 ON

371 ERI Port Dover Harbor 42.78 80.20 ON

372 ERI Port Dover 42.78 80.20 ON

373 ERI Port Stanley 

Harbor

42.68 81.21 ON

374 ERI Port Stanley 42.65 81.20 ON

375 ERI Port Burwell 

Harbor

42.64 80.81 ON

376 ERI Port Burwell 42.63 80.81 ON

377 ERI Long Point 42.55 80.06 ON

378 ERI Dunkirk Harbor 42.49 79.33 NY

379 ERI Dunkirk 42.49 79.34 NY

380 ERI Rondeau 42.30 81.90 ON

381 ERI Rondeau Harbor 42.30 81.90 ON

382 ERI Erieau 42.26 81.91 ON

383 ERI Erieau Harbor 42.26 81.91 ON

384 ERI Lake Erie 42.13 81.50 OH

385 ERI Erie Harbor 42.12 80.13 PA

386 ERI Erie 42.12 80.13 PA

387 ERI Leamington 

Harbor

42.05 82.61 ON

388 ERI Leamington 42.05 82.61 ON

Table 4. Comprehensive List of All Sites: Number, Lake/River Name, Latitude, Longitude, and State/

Province (continued).
22

NO Lake Name Lat. Lon. S/P

389 ERI Kingsville 42.02 82.74 ON

390 ERI Colchester 42.00 82.91 ON

391 ERI Conneaut Harbor 41.97 80.55 OH

392 ERI Conneaut 41.97 80.55 OH

393 ERI Monroe 41.90 83.35 MI

394 ERI Monroe Harbor 41.90 83.35 MI

395 ERI Ashtabula 41.90 80.80 OH

396 ERI Ashtabula Harbor 41.89 80.79 OH

397 ERI Pelee 41.75 82.67 ON

398 ERI Pelee Island 41.75 82.67 ON

399 ERI Fairport Harbor 41.74 81.27 OH

400 ERI Fairport 41.74 81.28 OH

401 ERI Toledo - Maumee 

River

41.72 83.40 OH

402 ERI Toledo - Maumee 

Bay

41.72 83.40 OH

403 ERI Maumee Bay 41.70 83.44 OH

404 ERI Bass Islands 41.68 82.82 OH

405 ERI Put-in-Bay 41.65 82.82 OH

406 ERI Put-In-Bay Harbor 41.65 82.82 OH

407 ERI Toledo Harbor 41.64 83.52 OH

408 ERI Toledo 41.64 83.52 OH

409 ERI Kelleys Island 

Harbor

41.60 82.71 OH

410 ERI Kelleys Island 41.60 82.71 OH

411 ERI Marblehead 

Harbor

41.54 82.71 OH

412 ERI Marblehead 41.54 82.71 OH

413 ERI Cleveland 41.52 81.69 OH

414 ERI Cleveland Harbor 41.51 81.68 OH

415 ERI Port Clinton 41.51 82.94 OH

416 ERI Cedar Point 41.49 82.69 OH

417 ERI Cedar Point 

Harbor

41.49 82.69 OH

418 ERI Sandusky 41.48 82.84 OH

419 ERI Sandusky Harbor 41.47 82.84 OH

420 ERI Lorain Harbor 41.45 82.17 OH

421 ERI Lorain 41.45 82.17 OH

MO Lake Name Lat. Lon. S/P

422 ERI Vermilion 41.42 82.36 OH

423 ERI Vermilion Harbor 41.42 82.36 OH

424 ERI Huron 41.40 82.55 OH

425 ERI Huron Harbor 41.39 82.54 OH

426 ONT Kingston Harbor 44.20 76.50 ON

427 ONT Kingston 44.20 76.50 ON

428 ONT North Channel 44.19 76.78 ON

429 ONT Belleville 44.18 77.39 ON

430 ONT Deseronto 44.17 77.06 ON

431 ONT Deseronto Harbor 44.17 77.06 ON

432 ONT Wolfe Island 44.15 76.50 ON

433 ONT Amherst Island 44.15 76.69 ON

434 ONT Hay Bay 44.14 77.00 ON

435 ONT Cape Vincent 44.13 76.33 NY

436 ONT Cape Vincent 

Harbor

44.12 76.33 NY

437 ONT Big Sandy 44.10 76.48 NY

438 ONT Trenton Harbor 44.10 77.58 ON

439 ONT Bay of Quinte 44.10 77.58 ON

440 ONT Adolphus Reach 44.10 76.93 ON

441 ONT Trent River 44.10 77.58 ON

442 ONT Trenton 44.10 77.58 ON

443 ONT Muscote Bay 44.08 77.28 ON

444 ONT Picton Bay 44.00 77.13 ON

445 ONT Presquille Bay 44.00 77.72 ON

446 ONT Murray Canal 44.00 77.62 ON

447 ONT Prince Edward 

Peninsula

44.00 77.00 ON

448 ONT Weller Bay 43.99 77.59 ON

449 ONT Prince Edward 

Bay

43.95 77.00 ON

450 ONT Wellington Bay 43.95 77.35 ON

451 ONT Sackets Harbor 43.94 76.12 NY

452 ONT Long Reach 43.93 76.85 ON

453 ONT Coburg 43.93 78.18 ON

454 ONT Coburg Harbor 43.93 78.18 ON

455 ONT Galloo Island 43.91 76.42 NY

Table 4. Comprehensive List of All Sites: Number, Lake/River Name, Latitude, Longitude, and State/

Province (continued).
23

NO Lake Name Lat. Lon. S/P

456 ONT Athol Bay 43.90 77.24 ON

457 ONT Stony Point 43.85 76.27 NY

458 ONT Toronto Harbor 43.65 79.45 ON

459 ONT Toronto 43.65 79.45 ON

460 ONT Lake Ontario 43.60 78.00 NY

461 ONT Mexico Bay 43.52 76.30 NY

462 ONT Oswego Harbor 43.45 76.55 NY

463 ONT Oswego 43.45 76.56 NY

464 ONT North Fair Haven 43.33 76.70 NY

465 ONT North Fair Haven 

Harbor

43.33 76.70 NY

466 ONT Fair Haven 43.32 76.70 NY

467 ONT Fair Haven Harbor 43.32 76.70 NY

468 ONT Niagara Harbor 43.27 79.04 NY

469 ONT Niagara River - 

Niagara

43.27 79.04 NY

470 ONT Niagara River 43.27 79.04 NY

471 ONT Fort Niagara 43.27 79.04 NY

472 ONT Niagara 43.27 79.04 NY

473 ONT Rochester 43.26 77.60 NY

474 ONT Rochester Harbor 43.26 77.60 NY

475 ONT Irondequoit Bay 43.26 77.60 NY

476 ONT Charlotte Harbor 43.26 77.62 NY

477 ONT Charlotte 43.26 77.62 NY

478 ONT Sodus Bay 43.26 76.97 NY

479 ONT Sodus Bay Harbor 43.26 76.97 NY

MO Lake Name Lat. Lon. S/P

480 ONT Sodus Point 43.26 76.97 NY

481 ONT Sodus Point 

Harbor

43.25 76.96 NY

482 ONT Youngstown 

Harbor

43.25 79.05 NY

483 ONT Youngstown 43.25 79.05 NY

484 STL Jacques Cartier 

Bridge

45.67 73.75 QU

485 STL Lachine 45.50 73.50 QU

486 STL Montreal Harbor 45.44 73.50 QU

487 STL Montreal 45.44 73.30 QU

488 STL Lake St. Louis 45.40 73.70 QU

489 STL Valleyfield Bridge 45.25 74.13 QU

490 STL Lake St. Francis 45.22 74.50 QU

491 STL Beauharnois 45.22 73.85 QU

492 STL Cornwall Canal 45.22 73.86 ON

493 STL Cornwall 45.03 74.75 ON

494 STL Iroquois Lock 44.83 75.30 ON

495 STL Prescott Harbor 44.73 75.46 NY

496 STL Prescott 44.73 75.46 NY

497 STL Ogdensburg 44.71 75.47 NY

498 STL St. Lawrence River 44.71 75.47 NY

499 STL Ogdensburg 

Harbor

44.70 75.47 NY

500 STL Alexandria Bay 44.34 75.92 NY

501 STL Alexandria Bay 

Harbor

44.34 75.92 NY

Table 4. Comprehensive List of All Sites: Number, Lake/River Name, Latitude, Longitude, and State/

Province (continued).
24

Site No. Total Records Site No. Total Records Site No. Total Records Site No. Total Records

6 205 105 399 228 633 384 420

8 198 114 256 231 199 385 163

22 243 127 243 236 120 386 245

23 158 135 100 237 178 391 152

24 135 138 152 238 289 392 118

25 445 139 244 245 168 395 153

29 939 142 137 261 117 396 114

33 454 143 128 262 222 405 127

37 149 146 256 271 164 413 213

38 193 150 144 272 143 414 176

40 207 153 130 282 312 418 163

51 458 154 138 292 226 419 110

52 465 155 156 293 399 426 173

53 131 167 144 294 157 427 157

54 199 171 124 298 102 439 105

58 264 172 125 304 393 451 118

66 317 179 324 307 100 460 381

67 258 181 121 351 133 462 200

71 410 198 144 353 381 463 165

75 233 199 143 357 527 465 165

76 316 200 206 359 468 480 106

77 374 201 153 363 101 481 170

80 116 205 238 368 419 496 110

83 177 214 245 369 216 497 276

84 202 215 172 378 120 498 229

87 183 216 107 379 185 500 178

Table 5. Sites (in numerical order) with the Greatest Number of Records.
25

Appendix 1. Individual Site Reports for all Winters: 1899 - 1970

Table computer file structure

The first eight records contain the table title: site number, site name, and latitude and longitude, 

and column headings and the last five records of the file contain footnotes. The records in 

between are data records. 

Data record format

The Fortran format used to write data records is: (1x, i4, 2(1x,i2), 3(1x, i4, 1x, i4, 3x, a2), 

i4,1x, i4, 2x, a7, 3x, a32). Each record contains 16 fixed formatted fields, where x = blank 

space, i = integer variable, a = character variable. Field descriptions are given below.

Field Description

01-03. Year, Month, Day

04. T1 = ice thickness or part of a range if T2 is present

05. T2, 

06. C1 = primary condition of ice.

07. T1C1 = thickness of C1 or part of range if T2C1 is preset.

08. T2C1

09-14. C2, T1C2, T2C2, C3, T1C3, T2C3 are secondary and ternary ice condition and 

thickness of condition, if reported.

15. Image = the image file of the original ice chart associated with this record.

16. Supplemental information. Ice characteristics not given under ice conditions or 

location description.

Charts MAP001.GIF through MAP501.GIF are located at 

ftp://ftp.glerl.noaa.gov/publications/tech_reports/glerl-130/appendix1/Charts. File M001 

corresponds to MAP001.GIF, File M002 corresponds to MAP502.GIF ..... File M501 

corresponds to MAP501.GIF.

Tables SITE001.TXT through SITE501.TXT are located at 

ftp://ftp.glerl.noaa.gov/publications/tech_reports/glerl-130/appendix1/Tables. File T001 

corresponds to SITE001.TXT, File T002 corresponds to SITE502.TXT ..... File T501 

corresponds to SITE501.TXT.
26

Appendix 2. Individual Winter Season Aggregated Site Ice Reports

Table computer file structure

The first six records contain the table title, year, and headings and the last five records of the file 

contain footnotes. The records in between are data records. 

Data record format. 

The Fortran format used to write data records is: (3x, i4, 3x, i4, 2(1x,i2), 3(1x, i4, 1x, i4, 

3x, a2), i4,1x, i4, 2x, a7,2x, a32). Each record contains 17 fixed formatted fields, where x = 

blank space, i = integer variable, a = character variable. Field descriptions are given below. 

Using the site number one can look up the site name in Table 4 of the report.

Field Description

01 Site number

02-04 Year, Month, Day

05 T1 = ice thickness or part of a range if T2 is present.

06 T2, 

07 C1 = primary condition of ice.

08 T1C1 = thickness of C1 or part of range if T2C1 is present.

09 T2C1

10-15 C2, T1C2, T2C2, C3, T1C3, T2C3 are secondary and ternary ice conditon and 

thickness of condition, if reported.

16 Image = the image file of the original ice chart associated with this record.

17 Supplemental information = ice characteristics not given under ice conditions or 

location description.

Charts winter1899.gif through winter 1970.gif are located at 

ftp://ftp.glerl.noaa.gov/publications/tech_reports/glerl-130/appendix2/Charts. 

Tables C1899.TXT through C1970.TXT are located at 

ftp://ftp.glerl.noaa.gov/publications/tech_reports/glerl-130/appendix2/Tables. 
27

Appendix 3. Image Files Names and dates of Original NWS Ice Reports.

(Files are located at ftp://ftp.glerl.noaa.gov/publications/tech_reports/glerl-130/appendix3)

Year Mo Da No. Pg. Name Year Mo Da No. Pg. Name Year Mo Da No. Pg. Name

1899 4 11 1 1 529.TIF 1906 3 6 1 1 045.TIF 1913 3 4 1 1 090.TIF

1899 4 18 2 1 001.TIF 1906 3 13 2 1 046.TIF 1913 3 11 2 1 091.TIF

1899 4 25 3 1 002.TIF 1906 3 20 3 1 047.TIF 1913 3 18 3 1 092.TIF

1906 3 27 4 1 048.TIF 1913 3 25 4 1 093.TIF

1900 2 27 1 1 003.TIF 1906 4 3 5 1 049.TIF 1913 4 1 5 1 094.TIF

1900 3 6 2 1 004.TIF 1906 4 10 6 1 050.TIF 1913 4 8 6 1 095.TIF

1900 3 13 3 1 005.TIF 1913 4 15 7 1 096.TIF

1900 3 20 4 1 006.TIF 1907 3 5 1 1 051.TIF 1913 4 22 8 1 097.TIF

1900 3 27 5 1 007.TIF 1907 3 12 2 1 052.TIF

1900 4 3 6 1 008.TIF 1907 3 19 3 1 053.TIF 1914 3 3 1 1 098.TIF

1900 4 10 7 1 009.TIF 1907 3 26 4 1 054.TIF 1914 3 10 2 1 099.TIF

1900 4 17 8 1 010.TIF 1907 4 2 5 1 055.TIF 1914 3 17 3 1 100.TIF

1907 4 9 6 1 056.TIF 1914 3 24 4 1 101.TIF

1901 3 5 1 1 011.TIF 1914 3 31 5 1 102.TIF

1901 3 12 2 1 012.TIF 1908 3 3 1 1 057.TIF 1914 4 7 6 1 103.TIF

1901 3 19 3 1 013.TIF 1908 3 10 2 1 058.TIF 1914 4 14 7 1 104.TIF

1901 3 26 4 1 014.TIF 1908 3 17 3 1 059.TIF 1914 4 21 8 1 105.TIF

1901 4 2 5 1 015.TIF 1908 3 24 4 1 060.TIF

1901 4 9 6 1 016.TIF 1908 3 31 5 1 524.TIF 1915 3 9 1 1 106.TIF

1901 4 16 7 1 017.TIF 1908 4 7 6 1 061.TIF 1915 3 16 2 1 107.TIF

1901 4 16 7 2 018.TIF 1908 4 14 7 1 062.TIF 1915 3 23 3 1 108.TIF

1908 4 21 8 1 063.TIF 1915 3 30 4 1 109.TIF

1902 3 4 1 1 019.TIF 1915 4 6 5 1 110.TIF

1902 3 11 2 1 020.TIF 1909 3 2 1 1 064.TIF 1915 4 13 6 1 111.TIF

1902 3 18 3 1 021.TIF 1909 3 9 2 1 065.TIF 1915 4 20 7 1 112.TIF

1902 3 25 4 1 022.TIF 1909 3 16 3 1 066.TIF

1902 4 1 5 1 023.TIF 1909 3 23 4 1 067.TIF 1916 3 7 1 1 113.TIF

1909 3 30 5 1 068.TIF 1916 3 14 2 1 114.TIF

1903 3 3 1 1 024.TIF 1909 4 6 6 1 069.TIF 1916 3 21 3 1 115.TIF

1903 3 10 2 1 025.TIF 1909 4 13 7 1 070.TIF 1916 3 28 4 1 116.TIF

1903 3 17 3 1 026.TIF 1916 4 4 5 1 117.TIF

1903 3 24 4 1 027.TIF 1910 3 1 1 1 071.TIF 1916 4 11 6 1 118.TIF

1903 3 31 5 1 028.TIF 1910 3 8 2 1 072.TIF 1916 4 18 7 1 119.TIF

1910 3 15 3 1 073.TIF

1904 3 1 1 1 029.TIF 1910 3 22 4 1 074.TIF 1917 3 6 1 1 120.TIF

1904 3 8 2 1 030.TIF 1910 3 29 5 1 075.TIF 1917 3 13 2 1 121.TIF

1904 3 15 3 1 031.TIF 1910 4 5 6 1 076.TIF 1917 3 20 3 1 122.TIF

1904 3 22 4 1 032.TIF 1917 3 27 4 1 123.TIF

1904 3 29 5 1 033.TIF 1911 3 7 1 1 077.TIF 1917 4 3 5 1 124.TIF

1904 4 5 6 1 034.TIF 1911 3 14 2 1 078.TIF 1917 4 10 6 1 125.TIF

1904 4 12 7 1 035.TIF 1911 3 21 3 1 079.TIF 1917 4 17 7 1 126.TIF

1904 4 19 8 1 036.TIF 1911 3 28 4 1 080.TIF 1917 4 24 8 1 127.TIF

1904 4 26 9 1 037.TIF 1911 4 4 5 1 081.TIF

1904 5 3 10 1 038.TIF 1918 3 5 1 1 128.TIF

1918 3 12 2 1 129.TIF

1905 3 7 1 1 039.TIF 1912 3 5 1 1 082.TIF 1918 3 19 3 1 130.TIF

1905 3 14 2 1 040.TIF 1912 3 12 2 1 083.TIF 1918 3 26 4 1 131.TIF

1905 3 21 3 1 041.TIF 1912 3 19 3 1 084.TIF 1918 4 2 5 1 132.TIF

1905 3 28 4 1 042.TIF 1912 3 26 4 1 085.TIF 1918 4 9 6 1 133.TIF

1905 4 4 5 1 043.TIF 1912 4 2 5 1 086.TIF 1918 4 16 7 1 134.TIF

1905 4 11 6 1 044.TIF 1912 4 9 6 1 087.TIF 1918 4 23 8 1 135.TIF

1912 4 16 7 1 088.TIF

1912 4 23 8 1 089.TIF
28

Year Mo Da No. Pg. Name Year Mo Da No. Pg. Name Year Mo Da No. Pg. Name

1919 3 4 1 1 136.TIF 1926 3 2 1 1 176.TIF 1933 3 7 1 1 220.TIF

1919 3 11 2 1 137.TIF 1926 3 9 2 1 177.TIF 1933 3 14 2 1 221.TIF

1919 3 18 3 1 138.TIF 1926 3 16 3 1 178.TIF 1933 3 21 3 1 222.TIF

1919 3 25 4 1 139.TIF 1926 3 23 4 1 179.TIF 1933 3 28 4 1 223.TIF

1926 3 30 5 1 180.TIF 1933 4 4 5 1 224.TIF

1920 3 9 1 1 140.TIF 1926 4 6 6 1 181.TIF 1933 4 11 6 1 225.TIF

1920 3 16 2 1 141.TIF 1926 4 13 7 1 182.TIF 1933 4 18 7 1 226.TIF

1920 3 23 3 1 142.TIF 1926 4 20 8 1 183.TIF 1933 4 25 8 1 227.TIF

1920 3 30 4 1 143.TIF 1926 4 27 9 1 184.TIF

1920 4 6 5 1 144.TIF 1934 3 6 1 1 228.TIF

1920 4 13 6 1 145.TIF 1927 3 8 1 1 185.TIF 1934 3 13 2 1 229.TIF

1927 3 15 2 1 186.TIF 1934 3 20 3 1 230.TIF

1921 3 8 1 1 146.TIF 1927 3 22 3 1 187.TIF 1934 3 27 4 1 231.TIF

1921 3 15 2 1 147.TIF 1927 3 29 4 1 188.TIF 1934 4 3 5 1 232.TIF

1921 3 22 3 1 148.TIF 1927 4 5 5 1 189.TIF 1934 4 10 6 1 233.TIF

1934 4 17 7 1 234.TIF

1922 3 7 1 1 149.TIF 1928 3 6 1 1 190.TIF 1934 4 24 8 1 235.TIF

1922 3 14 2 1 150.TIF 1928 3 13 2 1 191.TIF 1934 5 1 9 1 236.TIF

1922 3 21 3 1 151.TIF 1928 3 20 3 1 192.TIF

1922 3 28 4 1 152.TIF 1928 3 27 4 1 193.TIF 1935 3 5 1 1 237.TIF

1922 4 4 5 1 153.TIF 1928 4 3 5 1 194.TIF 1935 3 12 2 1 238.TIF

1922 4 11 6 1 154.TIF 1928 4 10 6 1 195.TIF 1935 3 19 3 1 239.TIF

1935 3 26 4 1 240.TIF

1923 3 6 1 1 155.TIF 1929 3 5 1 1 196.TIF 1935 4 2 5 1 241.TIF

1923 3 13 2 1 156.TIF 1929 3 12 2 1 197.TIF 1935 4 9 6 1 242.TIF

1923 3 20 3 1 157.TIF 1929 3 19 3 1 198.TIF 1935 4 16 7 1 243.TIF

1923 3 27 4 1 158.TIF 1929 3 26 4 1 199.TIF

1923 4 3 5 1 159.TIF 1929 4 2 5 1 200.TIF 1936 3 10 1 1 244.TIF

1923 4 10 6 1 160.TIF 1929 4 9 6 1 201.TIF 1936 3 17 2 1 245.TIF

1923 4 17 7 1 161.TIF 1936 3 23 3 1 246.TIF

1923 4 24 8 1 162.TIF 1930 3 4 1 1 202.TIF 1936 3 30 4 1 247.TIF

1930 3 11 2 1 203.TIF 1936 4 6 5 1 248.TIF

1924 3 4 1 1 163.TIF 1930 3 18 3 1 204.TIF 1936 4 13 6 1 249.TIF

1924 3 11 2 1 164.TIF 1930 3 25 4 1 205.TIF 1936 4 20 7 1 250.TIF

1924 3 18 3 1 165.TIF 1930 4 1 5 1 206.TIF 1936 4 27 8 1 251.TIF

1924 3 25 4 1 166.TIF 1930 4 8 6 1 207.TIF 1936 5 4 9 1 252.TIF

1924 4 1 5 1 167.TIF 1930 4 15 7 1 208.TIF

1924 4 8 6 1 168.TIF 1937 2 25 1 1 253.TIF

1924 4 15 7 1 169.TIF 1931 3 3 1 1 209.TIF 1937 3 8 2 1 254.TIF

1924 4 21 8 1 170.TIF 1931 3 10 2 1 210.TIF 1937 3 15 3 1 255.TIF

1931 3 17 3 1 211.TIF 1937 3 22 4 1 256.TIF

1925 3 17 1 1 171.TIF 1931 3 24 4 1 212.TIF 1937 3 29 5 1 257.TIF

1925 3 24 2 1 172.TIF 1931 3 31 5 1 213.TIF 1937 4 5 6 1 258.TIF

1925 3 31 3 1 173.TIF 1931 4 7 6 1 214.TIF 1937 4 12 7 1 259.TIF

1925 4 7 4 1 174.TIF 1937 4 19 8 1 260.TIF

1925 4 14 5 1 175.TIF 1932 3 8 1 1 215.TIF

1932 3 15 2 1 216.TIF

1932 3 22 3 1 217.TIF

1932 3 29 4 1 525.TIF

1932 4 5 5 1 218.TIF

1932 4 12 6 1 219.TIF

Appendix 3. Image Files Names and dates of Original NWS Ice Reports (cont).

(Files are located at ftp://ftp.glerl.noaa.gov/publications/tech_reports/glerl-130/appendix3)
29

Year Mo Da No. Pg. Name Year Mo Da No. Pg. Name Year Mo Da No. Pg. Name

1938 3 7 1 1 261.TIF 1944 3 6 1 1 308.TIF 1950 2 16 1 1 348.TIF

1938 3 14 2 1 262.TIF 1944 3 13 2 1 309.TIF 1950 2 27 2 1 349.TIF

1938 3 21 3 1 263.TIF 1944 3 20 3 1 310.TIF 1950 3 6 1 1 350.TIF

1938 3 28 4 1 264.TIF 1944 3 27 4 1 311.TIF 1950 3 15 2 1 351.TIF

1938 4 4 5 1 265.TIF 1944 4 3 5 1 312.TIF 1950 3 20 3 1 352.TIF

1938 4 11 6 1 266.TIF 1944 4 10 6 1 313.TIF 1950 3 27 4 1 353.TIF

1938 4 18 7 1 267.TIF 1944 4 17 7 1 314.TIF 1950 4 3 5 1 354.TIF

1950 4 10 6 1 355.TIF

1939 3 6 1 1 268.TIF 1945 3 19 3 1 315.TIF 1950 4 17 7 1 356.TIF

1939 3 13 2 1 269.TIF 1945 3 26 4 1 316.TIF 1950 4 24 8 1 357.TIF

1939 3 20 3 1 270.TIF 1945 4 2 5 1 317.TIF 1950 5 1 9 1 358.TIF

1939 3 27 4 1 271.TIF

1939 4 3 5 1 272.TIF 1946 3 4 1 1 318.TIF 1951 2 26 0 1 359.TIF

1939 4 10 6 1 273.TIF 1946 3 11 2 1 319.TIF 1951 3 5 1 1 360.TIF

1939 4 17 7 1 274.TIF 1946 3 18 3 1 320.TIF 1951 3 12 2 1 361.TIF

1939 4 24 8 1 275.TIF 1946 3 25 4 1 321.TIF 1951 3 19 3 1 362.TIF

1939 5 1 9 1 276.TIF 1946 4 1 5 1 322.TIF 1951 3 26 4 1 363.TIF

1946 4 8 6 1 323.TIF 1951 4 2 5 1 364.TIF

1940 3 4 1 1 277.TIF 1951 4 9 6 1 365.TIF

1940 3 11 2 1 278.TIF 1947 2 19 1 1 324.TIF 1951 4 16 7 1 366.TIF

1940 3 18 3 1 279.TIF 1947 2 19 1 2 325.TIF

1940 3 24 4 1 280.TIF 1947 3 3 2 1 326.TIF 1952 2 25 0 1 367.TIF

1940 4 1 5 1 281.TIF 1947 3 10 3 1 327.TIF 1952 3 3 1 1 368.TIF

1940 4 8 6 1 282.TIF 1947 3 17 4 1 328.TIF 1952 3 10 2 1 369.TIF

1940 4 15 7 1 283.TIF 1947 3 24 5 1 329.TIF 1952 3 17 3 1 370.TIF

1940 4 22 8 1 284.TIF 1947 3 31 6 1 330.TIF 1952 3 24 4 1 371.TIF

1947 4 7 7 1 331.TIF 1952 3 31 5 1 372.TIF

1941 3 3 1 1 285.TIF 1947 4 14 8 1 332.TIF 1952 4 7 6 1 373.TIF

1941 3 10 2 1 286.TIF 1947 4 21 9 1 333.TIF 1952 4 14 7 1 374.TIF

1941 3 17 3 1 287.TIF

1941 3 24 4 1 288.TIF 1948 3 1 1 1 334.TIF 1953 2 24 0 1 375.TIF

1941 3 31 5 1 289.TIF 1948 3 8 2 1 335.TIF 1953 3 2 2 1 528.TIF

1941 4 7 6 1 290.TIF 1948 3 15 3 1 336.TIF 1953 3 9 2 1 376.TIF

1941 4 14 7 1 291.TIF 1948 3 22 4 1 337.TIF 1953 3 9 2 2 377.TIF

1948 3 29 5 1 338.TIF 1953 3 16 3 1 378.TIF

1942 3 9 2 1 292.TIF 1948 4 5 6 1 339.TIF 1953 3 23 4 1 379.TIF

1942 3 16 3 1 293.TIF 1948 4 12 7 1 340.TIF 1953 3 30 5 1 380.TIF

1942 3 23 4 1 294.TIF

1942 3 30 5 1 295.TIF 1949 2 28 1 1 526.TIF 1954 3 1 1 1 381.TIF

1942 4 6 6 1 296.TIF 1949 2 28 1 2 527.TIF 1954 3 8 2 1 382.TIF

1942 4 13 7 1 297.TIF 1949 3 7 2 1 341.TIF 1954 3 15 3 1 383.TIF

1949 3 7 2 2 342.TIF 1954 3 22 4 1 384.TIF

1943 3 1 1 1 298.TIF 1949 3 14 3 1 343.TIF 1954 3 29 5 1 385.TIF

1943 3 8 2 1 299.TIF 1949 3 14 3 2 344.TIF 1954 4 5 6 1 386.TIF

1943 3 15 3 1 300.TIF 1949 3 21 4 1 345.TIF 1954 4 12 7 1 387.TIF

1943 3 22 4 1 301.TIF 1949 3 21 4 2 346.TIF 1954 4 19 8 1 388.TIF

1943 3 29 5 1 302.TIF 1949 3 28 5 1 347.TIF

1943 4 5 6 1 303.TIF

1943 4 12 7 1 304.TIF

1943 4 19 8 1 305.TIF

1943 4 26 9 1 306.TIF

1943 5 3 10 1 307.TIF

Appendix 3. Image Files Names and dates of Original NWS Ice Reports (cont).

(Files are located at ftp://ftp.glerl.noaa.gov/publications/tech_reports/glerl-130/appendix3)
30

Year Mo Da No. Pg. Name Year Mo Da No. Pg. Name Year Mo Da No. Pg. Name

1955 2 28 1 1 389.TIF 1960 2 19 1 1 523.TIF 1965 2 23 0 1 473.TIF

1955 2 28 1 2 390.TIF 1960 2 29 2 1 522.TIF 1965 3 1 1 1 474.TIF

1955 3 7 2 1 391.TIF 1960 3 7 2 1 434.TIF 1965 3 8 2 1 475.TIF

1955 3 7 2 2 392.TIF 1960 3 14 3 1 435.TIF 1965 3 15 3 1 476.TIF

1955 3 14 3 1 393.TIF 1960 3 21 4 1 436.TIF 1965 3 22 4 1 477.TIF

1955 3 21 4 1 394.TIF 1960 3 28 5 1 437.TIF 1965 3 29 5 1 478.TIF

1955 3 28 5 1 395.TIF 1960 4 4 6 1 438.TIF 1965 4 5 6 1 479.TIF

1955 4 11 7 1 396.TIF 1960 4 11 7 1 439.TIF 1965 4 12 7 1 480.TIF

1965 4 19 8 1 481.TIF

1956 2 27 1 1 397.TIF 1961 2 27 0 1 440.TIF 1965 4 26 9 1 482.TIF

1956 2 27 1 2 398.TIF 1961 3 6 1 1 441.TIF

1956 3 5 2 1 399.TIF 1961 3 13 2 1 442.TIF 1966 2 28 0 1 483.TIF

1956 3 5 2 2 400.TIF 1961 3 20 3 1 443.TIF 1966 3 7 1 1 484.TIF

1956 3 12 3 1 401.TIF 1961 3 27 4 1 444.TIF 1966 3 14 2 1 485.TIF

1956 3 19 4 1 402.TIF 1961 4 3 5 1 445.TIF 1966 3 21 3 1 486.TIF

1956 3 26 5 1 403.TIF 1961 4 10 6 1 446.TIF 1966 3 28 4 1 487.TIF

1956 4 2 6 1 404.TIF 1966 4 4 5 1 488.TIF

1956 4 9 7 1 405.TIF 1962 2 26 0 1 447.TIF

1956 4 16 8 1 406.TIF 1962 3 5 1 1 448.TIF 1967 2 27 0 1 489.TIF

1962 3 12 2 1 449.TIF 1967 3 6 1 1 490.TIF

1957 2 25 1 1 407.TIF 1962 3 19 3 1 450.TIF 1967 3 13 2 1 491.TIF

1957 2 25 1 2 408.TIF 1962 3 26 4 1 451.TIF 1967 3 20 3 1 492.TIF

1957 3 4 2 1 409.TIF 1962 4 2 5 1 452.TIF 1967 3 27 4 1 493.TIF

1957 3 4 2 2 410.TIF 1962 4 9 6 1 453.TIF 1967 4 3 5 1 494.TIF

1957 3 11 3 1 411.TIF 1962 4 16 7 1 454.TIF 1967 4 10 6 1 495.TIF

1957 3 11 3 2 412.TIF 1962 4 23 8 1 455.TIF 1967 4 17 7 1 496.TIF

1957 3 25 5 1 413.TIF

1957 4 1 6 1 414.TIF 1963 2 25 0 1 456.TIF 1968 2 26 1 1 521.TIF

1957 4 15 8 1 415.TIF 1963 3 4 1 1 457.TIF 1968 3 4 2 1 520.TIF

1963 3 11 2 1 458.TIF 1968 3 11 2 1 497.TIF

1958 2 24 0 1 416.TIF 1963 3 18 3 1 459.TIF 1968 3 18 3 1 498.TIF

1958 3 3 1 1 417.TIF 1963 3 25 4 1 460.TIF 1968 3 25 4 1 499.TIF

1958 3 10 2 1 418.TIF 1963 4 1 5 1 461.TIF 1968 4 1 5 1 500.TIF

1958 3 17 3 1 419.TIF 1963 4 8 6 1 462.TIF 1968 4 8 6 1 501.TIF

1958 3 24 4 1 420.TIF 1963 4 15 7 1 463.TIF 1968 4 15 7 1 502.TIF

1958 3 31 5 1 421.TIF 1963 4 22 8 1 464.TIF

1958 4 7 6 1 422.TIF 1969 2 24 0 1 503.TIF

1958 4 14 7 1 423.TIF 1964 2 24 0 1 465.TIF 1969 3 3 1 1 504.TIF

1964 3 2 1 1 466.TIF 1969 3 10 2 1 505.TIF

1959 3 2 1 1 424.TIF 1964 3 9 2 1 467.TIF 1969 3 17 3 1 506.TIF

1959 3 9 2 1 425.TIF 1964 3 16 3 1 468.TIF 1969 3 24 4 1 507.TIF

1959 3 16 3 1 426.TIF 1964 3 23 4 1 469.TIF 1969 3 31 5 1 508.TIF

1959 3 23 4 1 427.TIF 1964 3 30 5 1 470.TIF 1969 4 7 6 1 509.TIF

1959 3 23 4 2 428.TIF 1964 4 6 6 1 471.TIF 1969 4 14 7 1 510.TIF

1959 3 30 5 1 429.TIF 1964 4 13 7 1 472.TIF

1959 4 6 6 1 430.TIF 1970 2 24 1 1 519.TIF

1959 4 13 7 1 431.TIF 1970 3 3 2 1 518.TIF

1959 4 20 8 1 432.TIF 1970 3 10 3 1 511.TIF

1959 4 27 9 1 433.TIF 1970 3 17 4 1 512.TIF

1970 3 24 5 1 513.TIF

1970 3 31 6 1 514.TIF

1970 4 7 7 1 515.TIF

1970 4 14 8 1 516.TIF

1970 4 14 8 1 516.TIF

1970 4 21 9 1 517.TIF

Appendix 3. Image Files Names and dates of Original NWS Ice Reports (cont).

(Files are located at ftp://ftp.glerl.noaa.gov/publications/tech_reports/glerl-130/appendix3)
31

Appendix 4. Distribution of Number of Reports Per Site Per Winter.

Table computer file structure

The first record contains the table title, the second record is left blank, the third record is a header 

for the station number label and 72 yearly labels. The last 510 records contain the station number 

in the first field of the record. The last 72 fields of the record contain either a zero or an integer, 

corresponding to the number of reports each winter.

Data record format

The Fortran format for the data records is: (1x, i3, 72(i4, 1x)). Each record contains 73 

fixed formatted fields, where x = blank space, i = integer variable, 72 = the number of 

times the (i4,1x) part of the format is repeated. The first field as indicated below is the 

station number, followed by 72 fields that are the number of observations for each winter 

from 1899 to 1970 for that station.

This file are located at ftp://ftp.glerl.noaa.gov/publications/tech_reports/glerl-130/appendix4
32