NOAA TECHNICAL MEMORANDUM 

NWS WR-271 

CLIMATE OF LAS VEGAS, NEVADA 

Revision 2 by: 

Andrew S. Gorelow 

January 2005 

First Edition: 

Paul H. Skrbac, – December 1999 

 UNITED STATES National Oceanic and National Weather Service 

DEPARTMENT OF COMMERCE Atmospheric Administration David L. Johnson, Assistant 

Donald Evans, Secretary Conrad C.. Lautenbacher Administrator for Weather Services 

 Under Secretary 

 and Administrator 
This publication has been reviewed 

and is approved for publication by 

Scientific Services Division, 

Western Region 

Delain A. Edman, Chief 

Scientific Services Division 

Salt Lake City, Utah 

 

iii

 

 
NOAA TECHNICAL MEMORANDA

National Weather Service, Western Region Subseries

The National Weather Service (NWS) Western Region (WR) Subseries provides an informal medium

for the documentation and quick dissemination of results not appropriate, or not yet ready, for formal

publication. The series is used to report on work in progress, to describe technical procedures and 

practices, or to relate progress to a limited audience. These Technical Memoranda will report on 

investigations devoted primarily to regional and local problems of interest mainly to personnel, and 

hence will not be widely distributed.

Papers 1 to 25 are in the former series, ESSA Technical Memoranda, Western Region Technical

Memoranda (WRTM); papers 24 to 59 are in the former series, ESSA Technical Memoranda, 

Weather Bureau Technical Memoranda (WBTM). Beginning with 60, the papers are part of the 

series, NOAA Technical Memoranda NWS. Out-of-print memoranda are not listed. 

Papers 2 to 22, except for 5 (revised edition), are available from the National Weather Service 

Western Region, Scientific Services Division, 125 South State Street - Rm 1311, Salt Lake City, Utah

84138-1102. Paper 5 (revised edition), and all others beginning with 25 are available from the 

National Technical Information Service, U.S. Department of Commerce, Sills Building, 5285 Port 

Royal Road, Springfield, Virginia 22161. Prices vary for all paper copies; microfiche are $3.50. Order

by accession number shown in parentheses at end of each entry. 

ESSA Technical Memoranda (WRTM)

 2 Climatological Precipitation Probabilities. Compiled by Lucianne Miller, December 1965. 

3 Western Region Pre- and Post-FP-3 Program, December 1, 1965, to February 20, 1966. 

Edward D. Diemer, March 1966. 

 5 Station Descriptions of Local Effects on Synoptic Weather Patterns. Philip Williams, Jr., April 

1966 (Revised November 1967, October 1969). (PB-17800)

 8 Interpreting the RAREP. Herbert P. Benner, May 1966 (Revised January 1967).

11 Some Electrical Processes in the Atmosphere. J. Latham, June 1966. 

17 A Digitalized Summary of Radar Echoes within 100 Miles of Sacramento, California. J. A. 

Youngberg and L. B. Overaas, December 1966. 

21 An Objective Aid for Forecasting the End of East Winds in the Columbia Gorge, July through 

October. D. John Coparanis, April 1967. 

22 Derivation of Radar Horizons in Mountainous Terrain. Roger G. Pappas, April 1967.

ESSA Technical Memoranda, Weather Bureau Technical Memoranda (WBTM)

25 Verification of Operation Probability of Precipitation Forecasts, April 1966-March 1967. W. W.

Dickey, October 1967. (PB-176240)

26 A Study of Winds in the Lake Mead Recreation Area. R. P. Augulis, January 1968. (PB177830)

28 Weather Extremes. R. J. Schmidli, April 1968 (Revised March 1986). (PB86 177672/AS). 

(Revised October 1991 - PB92-115062/AS)

29 Small-Scale Analysis and Prediction. Philip Williams, Jr., May 1968. (PB178425) 

30 Numerical Weather Prediction and Synoptic Meteorology. CPT Thomas D. Murphy, USAF, May

1968. (AD 673365)

31 Precipitation Detection Probabilities by Salt Lake ARTC Radars. Robert K. Belesky, July 1968. 

(PB 179084)

32 Probability Forecasting--A Problem Analysis with Reference to the Portland Fire Weather 

District. Harold S. Ayer, July 1968. (PB 179289)

36 Temperature Trends in Sacramento--Another Heat Island. Anthony D. Lentini, February 1969. 

(PB 183055)

37 Disposal of Logging Residues Without Damage to Air Quality. Owen P. Cramer, March 1969. 

(PB 183057)

39 Upper-Air Lows Over Northwestern United States. A.L. Jacobson, April 1969. PB 184296)

40 The Man-Machine Mix in Applied Weather Forecasting in the 1970s. L.W. Snellman, August 

1969. (PB 185068)

43 Forecasting Maximum Temperatures at Helena, Montana. David E. Olsen, October 1969. (PB 

185762)

44 Estimated Return Periods for Short-Duration Precipitation in Arizona. Paul C. Kangieser,

October 1969. (PB 187763)

46 Applications of the Net Radiometer to Short-Range Fog and Stratus Forecasting at Eugene, 

Oregon. L. Yee and E. Bates, December 1969. (PB 190476)

47 Statistical Analysis as a Flood Routing Tool. Robert J.C. Burnash, December 1969. (PB 

188744)

48 Tsunami. Richard P. Augulis, February 1970. (PB 190157)

49 Predicting Precipitation Type. Robert J.C. Burnash and Floyd E. Hug, March 1970. (PB 

190962)

50 Statistical Report on Aeroallergens (Pollens and Molds) Fort Huachuca, Arizona, 1969. Wayne

S. Johnson, April 1970. (PB 191743)

51 Western Region Sea State and Surf Forecaster's Manual. Gordon C. Shields and Gerald B. 

Burdwell, July 1970. (PB 193102)

52 Sacramento Weather Radar Climatology. R.G. Pappas and C. M. Veliquette, July 1970. (PB 

193347)

54 A Refinement of the Vorticity Field to Delineate Areas of Significant Precipitation. Barry B. 

Aronovitch, August 1970. 

55 Application of the SSARR Model to a Basin without Discharge Record. Vail Schermerhorn and 

Donal W. Kuehl, August 1970. (PB 194394)

56 Areal Coverage of Precipitation in Northwestern Utah. Philip Williams, Jr., and Werner J. Heck,

September 1970. (PB 194389)

57 Preliminary Report on Agricultural Field Burning vs. Atmospheric Visibility in the Willamette 

Valley of Oregon. Earl M. Bates and David O. Chilcote, September 1970. (PB 194710)

58 Air Pollution by Jet Aircraft at Seattle-Tacoma Airport. Wallace R. Donaldson, October 1970. 

(COM 71 00017)

59 Application of PE Model Forecast Parameters to Local-Area Forecasting. Leonard W.

Snellman, October 1970. (COM 71 00016)

60 An Aid for Forecasting the Minimum Temperature at Medford, Oregon, Arthur W. Fritz, October

1970. (COM 71 00120)

63 700-mb Warm Air Advection as a Forecasting Tool for Montana and Northern Idaho. Norris E. 

Woerner, February 1971. (COM 71 00349)

64 Wind and Weather Regimes at Great Falls, Montana. Warren B. Price, March 1971. 

65 Climate of Sacramento, California. Laura Masters-Bevan. NWSO Sacramento, November 1998 

(6th Revision. (PB99-118424)

66 A Preliminary Report on Correlation of ARTCC Radar Echoes and Precipitation. Wilbur K. Hall,

June 1971. (COM 71 00829)

69 National Weather Service Support to Soaring Activities. Ellis Burton, August 1971. (COM 71 

00956)

71 Western Region Synoptic Analysis-Problems and Methods. Philip Williams, Jr., February 1972. 

 (COM 72 10433)

74 Thunderstorms and Hail Days Probabilities in Nevada. Clarence M. Sakamoto, April 1972. 

(COM 72 10554)

75 A Study of the Low Level Jet Stream of the San Joaquin Valley. Ronald A. Willis and Philip 

Williams, Jr., May 1972. (COM 72 10707) 

76 Monthly Climatological Charts of the Behavior of Fog and Low Stratus at Los Angeles 

International Airport. Donald M. Gales, July 1972. (COM 72 11140)

77 A Study of Radar Echo Distribution in Arizona During July and August. John E. Hales, Jr., July

1972. (COM 72 11136)

78 Forecasting Precipitation at Bakersfield, California, Using Pressure Gradient Vectors. Earl T.

Riddiough, July 1972. (COM 72 11146)

79 Climate of Stockton, California. Robert C. Nelson, July 1972. (COM 72 10920) 

80 Estimation of Number of Days Above or Below Selected Temperatures. Clarence M. Sakamoto,

October 1972. (COM 72 10021)

81 An Aid for Forecasting Summer Maximum Temperatures at Seattle, Washington. Edgar G. 

Johnson, November 1972. (COM 73 10150)

82 Flash Flood Forecasting and Warning Program in the Western Region. Philip Williams, Jr., 

Chester L. Glenn, and Roland L. Raetz, December 1972, (Revised March 1978). (COM

73 10251)

83 A comparison of Manual and Semiautomatic Methods of Digitizing Analog Wind Records. 

Glenn E. Rasch, March 1973. (COM 73 10669)

86 Conditional Probabilities for Sequences of Wet Days at Phoenix, Arizona. Paul C. Kangieser, 

June 1973. (COM 73 11264)

87 A Refinement of the Use of K-Values in Forecasting Thunderstorms in Washington and Oregon. 

 Robert Y.G. Lee, June 1973. (COM 73 11276)

89 Objective Forecast Precipitation Over the Western Region of the United States. Julia N. Paegle

and Larry P. Kierulff, September 1973. (COM 73 11946/3AS)

91 Arizona "Eddy" Tornadoes. Robert S. Ingram, October 1973. (COM 73 10465)

92 Smoke Management in the Willamette Valley. Earl M. Bates, May 1974. (COM 74 11277/AS) 

93 An Operational Evaluation of 500-mb Type Regression Equations. Alexander E. MacDonald, 

June 1974. (COM 74 11407/AS)

94 Conditional Probability of Visibility Less than One-Half Mile in Radiation Fog at Fresno, 

California. John D. Thomas, August 1974. (COM 74 11555/AS)

95 Climate of Flagstaff, Arizona. Paul W. Sorenson, and updated by Reginald W. Preston, January

1987. (PB87 143160/AS) (Revised August 2002 3rd Revision) 

96 Map type Precipitation Probabilities for the Western Region. Glenn E. Rasch and Alexander E.

MacDonald, February 1975. (COM 75 10428/AS)

97 Eastern Pacific Cut-Off Low of April 21-28, 1974. William J. Alder and George R. Miller, 

January 1976. (PB 250 711/AS)

98 Study on a Significant Precipitation Episode in Western United States. Ira S. Brenner, April

1976. (COM 75 10719/AS)

99 A Study of Flash Flood Susceptibility-A Basin in Southern Arizona. Gerald Williams, August 

1975. (COM 75 11360/AS)

102 A Set of Rules for Forecasting Temperatures in Napa and Sonoma Counties. Wesley L. Tuft, 

October 1975. (PB 246 902/AS)

103 Application of the National Weather Service Flash-Flood Program in the Western Region. 

Gerald Williams, January 1976. (PB 253 053/AS) 

104 Objective Aids for Forecasting Minimum Temperatures at Reno, Nevada, During the Summer

Months. Christopher D. Hill, January 1976. (PB 252 866/AS) 

105 Forecasting the Mono Wind. Charles P. Ruscha, Jr., February 1976. (PB 254 650)

106 Use of MOS Forecast Parameters in Temperature Forecasting. John C. Plankinton, Jr., March 

1976. (PB 254 649)

107 Map Types as Aids in Using MOS PoPs in Western United States. Ira S. Brenner, August 1976. 

 (PB 259 594)

108 Other Kinds of Wind Shear. Christopher D. Hill, August 1976. (PB 260 437/AS) 

109 Forecasting North Winds in the Upper Sacramento Valley and Adjoining Forests. Christopher E.

Fontana, September 1976. (PB 273 677/AS)

110 Cool Inflow as a Weakening Influence on Eastern Pacific Tropical Cyclones. William J. Denney,

November 1976. (PB 264 655/AS)

112 The MAN/MOS Program. Alexander E. MacDonald, February 1977. (PB 265 941/AS)

113 Winter Season Minimum Temperature Formula for Bakersfield, California, Using Multiple

Regression. Michael J. Oard, February 1977. (PB 273 694/AS)

114 Tropical Cyclone Kathleen. James R. Fors, February 1977. (PB 273 676/AS)

116 A Study of Wind Gusts on Lake Mead. Bradley Colman, April 1977. (PB 268 847)

117 The Relative Frequency of Cumulonimbus Clouds at the Nevada Test Site as a Function of KValue. R.F. Quiring, April 1977. (PB 272 831)

118 Moisture Distribution Modification by Upward Vertical Motion. Ira S. Brenner, April 1977. (PB 

268 740)

119 Relative Frequency of Occurrence of Warm Season Echo Activity as a Function of Stability

Indices Computed from the Yucca Flat, Nevada, Rawinsonde. Darryl Randerson, June

1977. (PB 271 290/AS)

121 Climatological Prediction of Cumulonimbus Clouds in the Vicinity of the Yucca Flat Weather 

Station. R.F. Quiring, June 1977. (PB 271 704/AS)

122 A Method for Transforming Temperature Distribution to Normality. Morris S. Webb, Jr., June 

1977. (PB 271 742/AS)

124 Statistical Guidance for Prediction of Eastern North Pacific Tropical Cyclone Motion - Part I. 

Charles J. Neumann and Preston W. Leftwich, August 1977. (PB 272 661)

125 Statistical Guidance on the Prediction of Eastern North Pacific Tropical Cyclone Motion - Part II. 

 Preston W. Leftwich and Charles J. Neumann, August 1977. (PB 273 155/AS)

126 Climate of San Francisco. E. Jan Null, February 1978. (Revised by George T. Pericht, April 

1988 and January 1995). (PB88 208624/AS)

127 Development of a Probability Equation for Winter-Type Precipitation Patterns in Great Falls, 

Montana. Kenneth B. Mielke, February 1978. (PB 281 387/AS)

128 Hand Calculator Program to Compute Parcel Thermal Dynamics. Dan Gudgel, April 1978. (PB

283 080/AS)

129 Fire whirls. David W. Goens, May 1978. (PB 283 866/AS)

130 Flash-Flood Procedure. Ralph C. Hatch and Gerald Williams, May 1978. (PB 286 014/AS) 

131 Automated Fire-Weather Forecasts. Mark A. Mollner and David E. Olsen, September 1978. 

(PB 289 916/AS)

132 Estimates of the Effects of Terrain Blocking on the Los Angeles WSR-74C Weather Radar. 

R.G. Pappas, R.Y. Lee, B.W. Finke, October 1978. (PB 289767/AS)

133 Spectral Techniques in Ocean Wave Forecasting. John A. Jannuzzi, October 1978. 

(PB291317/AS)

134 Solar Radiation. John A. Jannuzzi, November 1978. (PB291195/AS)

135 Application of a Spectrum Analyzer in Forecasting Ocean Swell in Southern California Coastal

Waters. Lawrence P. Kierulff, January 1979. (PB292716/AS)

136 Basic Hydrologic Principles. Thomas L. Dietrich, January 1979. (PB292247/AS)

137 LFM 24-Hour Prediction of Eastern Pacific Cyclones Refined by Satellite Images. John R. 

Zimmerman and Charles P. Ruscha, Jr., January 1979. (PB294324/AS)

138 A Simple Analysis/Diagnosis System for Real Time Evaluation of Vertical Motion. Scott Heflick 

and James R. Fors, February 1979. (PB294216/AS)

139 Aids for Forecasting Minimum Temperature in the Wenatchee Frost District. Robert S. 

Robinson, April 1979. (PB298339/AS)

140 Influence of Cloudiness on Summertime Temperatures in the Eastern Washington Fire Weather

district. James Holcomb, April 1979. (PB298674/AS)

141 Comparison of LFM and MFM Precipitation Guidance for Nevada During Doreen. Christopher
Hill, April 1979. (PB298613/AS) 

142 The Usefulness of Data from Mountaintop Fire Lookout Stations in Determining Atmospheric 

Stability. Jonathan W. Corey, April 1979. (PB298899/AS) 

143 The Depth of the Marine Layer at San Diego as Related to Subsequent Cool Season 

Precipitation Episodes in Arizona. Ira S. Brenner, May 1979. (PB298817/AS) 

144 Arizona Cool Season Climatological Surface Wind and Pressure Gradient Study. Ira S. 

Brenner, May 1979. (PB298900/AS) 

146 The BART Experiment. Morris S. Webb, October 1979. (PB80 155112) 

147 Occurrence and Distribution of Flash Floods in the Western Region. Thomas L. Dietrich, 

December 1979. (PB80 160344) 

149 Misinterpretations of Precipitation Probability Forecasts. Allan H. Murphy, Sarah Lichtenstein, 

Baruch Fischhoff, and Robert L. Winkler, February 1980. (PB80 174576) 

150 Annual Data and Verification Tabulation - Eastern and Central North Pacific Tropical Storms 

and Hurricanes 1979. Emil B. Gunther and Staff, EPHC, April 1980. (PB80 220486) 

151 NMC Model Performance in the Northeast Pacific. James E. Overland, PMEL-ERL, April 1980. 

 (PB80 196033) 

152 Climate of Salt Lake City, Utah. William J. Alder, Sean T. Buchanan, William Cope (Retired), 

James A. Cisco, Craig C. Schmidt, Alexander R. Smith (Retired), Wilbur E. Figgins 

(Retired), February 1998 - Seventh Revision (PB98-130727) 

153 An Automatic Lightning Detection System in Northern California. James E. Rea and Chris E. 

Fontana, June 1980. (PB80 225592) 

154 Regression Equation for the Peak Wind Gust 6 to 12 Hours in Advance at Great Falls During 

Strong Downslope Wind Storms. Michael J. Oard, July 1980. (PB91 108367) 

155 A Raininess Index for the Arizona Monsoon. John H. Ten Harkel, July 1980. (PB81 106494) 

156 The Effects of Terrain Distribution on Summer Thunderstorm Activity at Reno, Nevada. 

Christopher Dean Hill, July 1980. (PB81 102501) 

157 An Operational Evaluation of the Scofield/Oliver Technique for Estimating Precipitation Rates 

from Satellite Imagery. Richard Ochoa, August 1980. (PB81 108227) 

158 Hydrology Practicum. Thomas Dietrich, September 1980. (PB81 134033) 

159 Tropical Cyclone Effects on California. Arnold Court, October 1980. (PB81 133779) 

160 Eastern North Pacific Tropical Cyclone Occurrences During Intraseasonal Periods. Preston W. 

Leftwich and Gail M. Brown, February 1981. (PB81 205494) 

161 Solar Radiation as a Sole Source of Energy for Photovoltaics in Las Vegas, Nevada, for July 

and December. Darryl Randerson, April 1981. (PB81 224503) 

162 A Systems Approach to Real-Time Runoff Analysis with a Deterministic Rainfall-Runoff Model. 

Robert J.C. Burnash and R. Larry Ferral, April 1981. (PB81 224495) 

163 A Comparison of Two Methods for Forecasting Thunderstorms at Luke Air Force Base, Arizona. 

 LTC Keith R. Cooley, April 1981. (PB81 225393) 

164 An Objective Aid for Forecasting Afternoon Relative Humidity Along the Washington Cascade 

East Slopes. Robert S. Robinson, April 1981. (PB81 23078) 

165 Annual Data and Verification Tabulation, Eastern North Pacific Tropical Storms and Hurricanes 

1980. Emil B. Gunther and Staff, May 1981. (PB82 230336) 

166 Preliminary Estimates of Wind Power Potential at the Nevada Test Site. Howard G. Booth, 

June 1981. (PB82 127036) 

167 ARAP User's Guide. Mark Mathewson, July 1981, Revised September 1981. (PB82 196783) 

168 Forecasting the Onset of Coastal Gales Off Washington-Oregon. John R. Zimmerman and 

William D. Burton, August 1981. (PB82 127051) 

169 A Statistical-Dynamical Model for Prediction of Tropical Cyclone Motion in the Eastern North 

Pacific Ocean. Preston W. Leftwich, Jr., October 1981. (PB82195298) 

170 An Enhanced Plotter for Surface Airways Observations. Andrew J. Spry and Jeffrey L. 

Anderson, October 1981. (PB82 153883) 

171 Verification of 72-Hour 500-MB Map-Type Predictions. R.F. Quiring, November 1981. 

(PB82-158098) 

172 Forecasting Heavy Snow at Wenatchee, Washington. James W. Holcomb, December 1981. 

(PB82-177783) 

173 Central San Joaquin Valley Type Maps. Thomas R. Crossan, December 1981. (PB82 196064) 

174 ARAP Test Results. Mark A. Mathewson, December 1981. (PB82 198103) 

176 Approximations to the Peak Surface Wind Gusts from Desert Thunderstorms. Darryl 

Randerson, June 1982. (PB82 253089) 

177 Climate of Phoenix, Arizona. Robert J. Schmidli and Austin Jamison, April 1969 (Revised July 

1996). (PB96-191614) 

178 Annual Data and Verification Tabulation, Eastern North Pacific Tropical Storms and Hurricanes 

1982. E.B. Gunther, June 1983. (PB85 106078) 

179 Stratified Maximum Temperature Relationships Between Sixteen Zone Stations in Arizona and 

Respective Key Stations. Ira S. Brenner, June 1983. (PB83 249904) 

180 Standard Hydrologic Exchange Format (SHEF) Version I. Phillip A. Pasteris, Vernon C. Bissel, 

David G. Bennett, August 1983. (PB85 106052) 

181 Quantitative and Spacial Distribution of Winter Precipitation along Utah's Wasatch Front. 

Lawrence B. Dunn, August 1983. (PB85 106912) 

182 500 Millibar Sign Frequency Teleconnection Charts - Winter. Lawrence B. Dunn, December 

1983. (PB85 106276) 

183 500 Millibar Sign Frequency Teleconnection Charts - Spring. Lawrence B. Dunn, January 1984. 

 (PB85 111367) 

184 Collection and Use of Lightning Strike Data in the Western U.S. During Summer 1983. Glenn 

Rasch and Mark Mathewson, February 1984. (PB85 110534) 

185 500 Millibar Sign Frequency Teleconnection Charts - Summer. Lawrence B. Dunn, March 1984. 

 (PB85 111359) 

186 Annual Data and Verification Tabulation eastern North Pacific Tropical Storms and Hurricanes 

1983. E.B. Gunther, March 1984. (PB85 109635) 

187 500 Millibar Sign Frequency Teleconnection Charts - Fall. Lawrence B. Dunn, May 1984. 

(PB85-110930) 

188 The Use and Interpretation of Isentropic Analyses. Jeffrey L. Anderson, October 1984. 

(PB85-132694) 

189 Annual Data & Verification Tabulation Eastern North Pacific Tropical Storms and Hurricanes 

1984. E.B. Gunther and R.L. Cross, April 1985. (PB85 1878887AS) 

190 Great Salt Lake Effect Snowfall: Some Notes and An Example. David M. Carpenter, October 

1985. (PB86 119153/AS) 

191 Large Scale Patterns Associated with Major Freeze Episodes in the Agricultural Southwest. 

Ronald S. Hamilton and Glenn R. Lussky, December 1985. (PB86 144474AS) 

192 NWR Voice Synthesis Project: Phase I. Glen W. Sampson, January 1986. (PB86 145604/AS) 

193 The MCC - An Overview and Case Study on Its Impact in the Western United States. Glenn R. 

Lussky, March 1986. (PB86 170651/AS) 

194 Annual Data and Verification Tabulation Eastern North Pacific Tropical Storms and Hurricanes 

1985. E.B. Gunther and R.L. Cross, March 1986. (PB86 170941/AS) 

195 Radid Interpretation Guidelines. Roger G. Pappas, March 1986. (PB86 177680/AS) 

196 A Mesoscale Convective Complex Type Storm over the Desert Southwest. Darryl Randerson, 

April 1986. (PB86 190998/AS) 

197 The Effects of Eastern North Pacific Tropical Cyclones on the Southwestern United States. 

Walter Smith, August 1986. (PB87 106258AS) 

198 Preliminary Lightning Climatology Studies for Idaho. Christopher D. Hill, Carl J. Gorski, and 

Michael C. Conger, April 1987. (PB87 180196/AS) 

199 Heavy Rains and Flooding in Montana: A Case for Slantwise Convection. Glenn R. Lussky, 

April 1987. (PB87 185229/AS) 

200 Annual Data and Verification Tabulation Eastern North Pacific Tropical Storms and Hurricanes 

1986. Roger L. Cross and Kenneth B. Mielke, September 1987. (PB88 110895/AS) 

201 An Inexpensive Solution for the Mass Distribution of Satellite Images. Glen W. Sampson and 

George Clark, September 1987. (PB88 114038/AS) 

202 Annual Data and Verification Tabulation Eastern North Pacific Tropical Storms and Hurricanes 

1987. Roger L. Cross and Kenneth B. Mielke, September 1988. (PB88-101935/AS) 

203 An Investigation of the 24 September 1986 "Cold Sector" Tornado Outbreak in Northern 

California. John P. Monteverdi and Scott A. Braun, October 1988. (PB89 121297/AS) 

204 Preliminary Analysis of Cloud-To-Ground Lightning in the Vicinity of the Nevada Test Site. 

Carven Scott, November 1988. (PB89 128649/AS) 

205 Forecast Guidelines For Fire Weather and Forecasters -- How Nighttime Humidity Affects 

Wildland Fuels. David W. Goens, February 1989. (PB89 162549/AS) 

206 A Collection of Papers Related to Heavy Precipitation Forecasting. Western Region 

Headquarters, Scientific Services Division, August 1989. (PB89 230833/AS) 

207 The Las Vegas McCarran International Airport Microburst of August 8, 1989. Carven A. Scott, 

June 1990. (PB90-240268) 

208 Meteorological Factors Contributing to the Canyon Creek Fire Blowup, September 6 and 7, 

1988. David W. Goens, June 1990. (PB90-245085) 

209 Stratus Surge Prediction Along the Central California Coast. Peter Felsch and Woodrow 

Whitlatch, December 1990. (PB91-129239) 

210 Hydrotools. Tom Egger. January 1991. (PB91-151787/AS) 

211 A Northern Utah Soaker. Mark E. Struthwolf, February 1991. (PB91-168716) 

212 Preliminary Analysis of the San Francisco Rainfall Record: 1849-1990. Jan Null, May 1991. 

(PB91-208439) 

213 Idaho Zone Preformat, Temperature Guidance, and Verification. Mark A. Mollner, July 1991. 

(PB91-227405/AS) 

214 Emergency Operational Meteorological Considerations During an Accidental Release of 

Hazardous Chemicals. Peter Mueller and Jerry Galt, August 1991. (PB91-235424) 

215 WeatherTools. Tom Egger, October 1991. (PB93-184950) 

216 Creating MOS Equations for RAWS Stations Using Digital Model Data. Dennis D. Gettman, 

December 1991. (PB92-131473/AS) 

217 Forecasting Heavy Snow Events in Missoula, Montana. Mike Richmond, May 1992. 

(PB92-196104) 

218 NWS Winter Weather Workshop in Portland, Oregon. Various Authors, December 1992. 

(PB93-146785) 

219 A Case Study of the Operational Usefulness of the Sharp Workstation in Forecasting a 

Mesocyclone-Induced Cold Sector Tornado Event in California. John P. Monteverdi, 

March 1993. (PB93-178697) 

220 Climate of Pendleton, Oregon. Claudia Bell, August 1993. (PB93-227536) 

221 Utilization of the Bulk Richardson Number, Helicity and Sounding Modification in the 

Assessment of the Severe Convective Storms of 3 August 1992. Eric C. Evenson, 

September 1993. (PB94-131943) 

222 Convective and Rotational Parameters Associated with Three Tornado Episodes in Northern 

and Central California. John P. Monteverdi and John Quadros, September 1993. 

(PB94-131943) 

223 Climate of San Luis Obispo, California. Gary Ryan, February 1994. (PB94-162062) 

224 Climate of Wenatchee, Washington. Michael W. McFarland, Roger G. Buckman, and Gregory 

E. Matzen, March 1994. (PB94-164308) 

225 Climate of Santa Barbara, California. Gary Ryan, December 1994. (PB95-173720) 

226 Climate of Yakima, Washington. Greg DeVoir, David Hogan, and Jay Neher, December 1994. 

(PB95-173688) 

227 Climate of Kalispell, Montana. Chris Maier, December 1994. (PB95-169488) 

228 Forecasting Minimum Temperatures in the Santa Maria Agricultural District. Wilfred Pi and 

Peter Felsch, December 1994. (PB95-171088) 

229 The 10 February 1994 Oroville Tornado--A Case Study. Mike Staudenmaier, Jr., April 1995. 

(PB95-241873) 

230 Santa Ana Winds and the Fire Outbreak of Fall 1993. Ivory Small, June 1995. (PB95-241865) 

231 Washington State Tornadoes. Tresté Huse, July 1995. (PB96-107024) 

232 Fog Climatology at Spokane, Washington. Paul Frisbie, July 1995. (PB96-106604) 

233 Storm Relative Isentropic Motion Associated with Cold Fronts in Northern Utah. Kevin B. Baker, 

 Kathleen A. Hadley, and Lawrence B. Dunn, July 1995. (PB96-106596) 

234 Some Climatological and Synoptic Aspects of Severe Weather Development in the 

Northwestern United States. Eric C. Evenson and Robert H. Johns, October 1995. 

(PB96-112958) 

235 Climate of Las Vegas, Nevada. Paul H. Skrbac and Scott Cordero, December 1995. 

(PB96-135553) 

236 Climate of Astoria, Oregon. Mark A. McInerney, January 1996. 

237 The 6 July 1995 Severe Weather Events in the Northwestern United States: Recent Examples 

of SSWEs. Eric C. Evenson, April 1996. 

238 Significant Weather Patterns Affecting West Central Montana. Joe Lester, May 1996. 

(PB96-178751) 

239 Climate of Portland, Oregon. Clinton C. D. Rockey, May 1996. (PB96-17603) - First Revision, 

October 1999 

240 Downslop Winds of Santa Barbara, CA. Gary Ryan, July 1996. (PB96-191697) 

241 Operational Applications of the Real-time National Lightning Detection Network Data at the 

NWSO Tucson, AZ. Darren McCollum, David Bright, Jim Meyer, and John Glueck, 

September 1996. (PB97-108450) 

242 Climate of Pocatello, Idaho. Joe Heim, October 1996. (PB97-114540) 

243 Climate of Great Falls. Montana. Matt Jackson and D. C. Williamson, December 1996. (PB97-

126684) 

244 WSR-88D VAD Wind Profile Data Influenced by Bird Migration over the Southwest United 

States. Jesus A. Haro, January 1997. (PB97-135263) 

245 Climatology of Cape for Eastern Montana and Northern Wyoming. Heath Hockenberry and 

Keith Meier, January 1997. (PB97-133425) 

246 A Western Region Guide to the Eta-29 Model. Mike Staudenmaier, Jr., March 1997. (PB97-

144075) 

247 The Northeast Nevada Climate Book. Edwin C. Clark, March 1997. (First Revision - January 

1998 - Andrew S. Gorelow and Edwin C. Clark - PB98-123250) 

248 Climate of Eugene, Oregon. Clinton C. D. Rockey, April 1997. (PB97-155303) 

249 Climate of Tucson, Arizona. John R. Glueck, October 1997 

250 Northwest Oregon Daily Extremes and Normans. Clinton C. D. Rockey, October 1997 

251 A Composite Study Examining Five Heavy Snowfall Patterns for South-Central Montana. 

Jonathan D. Van Ausdall and Thomas W. Humphrey. February 1998. (PB98-125255) 

252 Climate of Eureka, California. Alan H. Puffer. February 1998. (PB98-130735) 

253 Inferenced Oceanic Kelvin/Rossby Wave Influence on North American West Coast 

Precipitation. Martin E. Lee and Dudley Chelton. April 1998. (PB98-139744) 

254 Conditional Symmetric Instability—Methods of Operational Diagnosis and Case Study of 23-24 

February 1994 Eastern Washington/Oregon Snowstorm. Gregory A. DeVoir. May 

1998. (PB98-144660) 

255 Creation and Maintenance of a Comprehensive Climate Data Base. Eugene Petrescu. August 

1998. (PB98-173529) 

256 Climate of San Diego, California. Thomas E. Evans, III and Donald A. Halvorson. October 

1998. (PB99-109381) 

257 Climate of Seattle, Washington. Dana Felton. November 1998. (PB99-113482) 

258 1985-1998 North Pacific Tropical Cyclones Impacting the Southwestern United States and 

Northern Mexico: An Updated Climatology. Armando L. Garza. January 1999. (PB99-

130502) 

259 Climate of San Jose, California. Miguel Miller. April 1999. (PB99-145633) 

260 Climate of Las Vegas, Nevada. Paul H. Skrbac. December 1999 

261 Climate of Los Angeles, California. David Bruno, Gary Ryan, with assistance from Curt Kaplan 

and Jonathan Slemmer. January 2000 

262 Climate of Miles City, Montana. David A. Spector and Mark H. Strobin. April 2000 

263 Analysis of Radiosonde Data for Spokane, Washington. Rocco D. Pelatti. November 2000 

264 Climate of Billings, Montana. Jeffrey J. Zeltwanger and Mark H. Strobin. November 2000 

265 Climate of Sheridan, Wyoming. Jeffrey J. Zeltwanger, Sally Springer, Mark H. Strobin. March 

2001 
266 Climate of Sacramento, California. Laura Masters-Bevan. December 2000 (7th Revision) 

267 Sulphur Mountain Doppler Radar: A Performance Study. Los Angeles/Oxnard WFO. August 

2001 

268 Prediction of Heavy Snow Events in the Snake River Plain Using Pattern Recognition and 

Regression Techniques. Thomas Andretta and William Wojcik. October 2003 

269 The Lewis and Clark Expedition 18-03-1806, Weather, Water and Climate, Vernon Preston, 

Pocatello Idaho, December 2004. 

270 Climate of San Diego, California, Emmanuel M. Isla, September 2004 (2nd Edition) 

271 Climate of Las Vegas, Nevada, Andrew S. Gorelow, January 2005, (2nd Edition) 
TABLE OF CONTENTS

ABSTRACT AND NARRATIVE SUMMARY..........................1-2 

 

MONTHLY NORMALS...........................................3 

MONTHLY EXTREMES (RECORDS)................................4 

MONTHLY TEMPERATURE EXTREMES/DAILY NORMALS

JANUARY ................................................5 

FEBRUARY ................................................6 

MARCH ................................................7 

APRIL ................................................8 

MAY ................................................9 

JUNE ................................................10 

JULY ................................................11 

AUGUST ................................................12 

SEPTEMBER ................................................13 

OCTOBER ................................................14 

NOVEMBER ................................................15 

DECEMBER ................................................16 

PRECIPITATION DATA

10 WETTEST AND DRIEST YEARS AND OVERALL MONTHS............17 

10 WETTEST AND DRIEST MONTHS BY MONTH..................18-20 

MEASURABLE PRECIPITATION DAYS AND EXTREMES................21 

CONSECUTIVE WET AND DRY DAYS..............................22 

24 HOUR PRECIPITATION RECORDS.............................23 

TEMPERATURE DATA

10 COLDEST AND HOTTEST YEARS AND OVERALL MONTHS...........24 

10 COLDEST AND HOTTEST MONTHS BY MONTH.................25-27 

DESERT HEAT STATISTICS.................................28-30 

FROST/FREEZE DATA.........................................31 

THUNDERSTORMS/HAIL

THUNDERSTORMS.............................................32 

HAIL......................................................33 

 

WIND

WIND NORMALS AND EXTREMES.................................34 

10 WINDIEST MONTHS BY MONTH............................35-36 
MISCELLANEOUS DATA

HEATING/COOLING DEGREE DAYS...............................37 

SNOW......................................................38 

SUNSHINE...............................................39-40 

CLOUDIEST MONTHS AND YEARS................................41 

RELATIVE HUMIDITY.........................................42 

FOG.......................................................43 

PRESSURE..................................................44 

HOLIDAY WEATHER........................................45-46 

CONSECUTIVE DAYS TEMPERATURES ABOVE AND BELOW NORMAL......47 

ACKNOWLEDGMENTS...........................................48 

FIGURES

Figure 1. Record Maximum and Minimum Monthly Temperatures 

Figure 2. Annual Precipitation (in inches), 1937-2004 

 

Figure 3. Average Relative Humidity at 4 A.M. and 4 P.M. PST 

Figure 4. Average Number of Thunderstorm Days, by Month 

Figure 5. Average Number of Days Exceeding 90F/100F, by Month 

Figure 6. Monthly Precipitation Extremes 

Figure 7. Peak Wind Gusts per Month 

Figure 8. Average Yearly Temperature by Decade 

Figure 9. Population of Clark County, Nevada 

Figure 10. Minimum Temperature by Decade 

Figure 11. Maximum Temperature by Decade 

Figure 12. Normal Monthly Precipitation 
1

CLIMATE OF LAS VEGAS, NEVADA 

ABSTRACT 

During the last two decades, the Las Vegas Valley has emerged as one of the fastest 

growing metropolitan areas in the nation. The population has expanded from about 

400,000 in 1980 to 1.8 million people in 2005. In addition, Las Vegas attracts more 

visitors annually than any other American city except Orlando, Florida. As a result, 

local forecasters continually field inquiries regarding the area's climate from a broad 

base of public interests. Official weather observations have been recorded in Las 

Vegas since 1937, initially at Nellis Field in the northeast portion of the valley, then 

later at McCarran Field on the south end. This paper is a revision of the 1999 edition 

and includes updated climate information through 2004. This paper is used as a 

reference for National Weather Service personnel to aid in responding to climate 

inquiries and is also intended to be a resource for the local media. 

NARRATIVE SUMMARY

I. Topography and History 

Las Vegas is located in a broad desert valley in extreme southern Nevada. Mountains 

surrounding the valley extend 2,000 to 10,000 feet above the valley floor. The Las Vegas 

Valley comprises about 600 square miles and runs from northwest to southeast. The valley 

is bounded on the north by the Sheep Range, while Boulder City and the Lake Mead 

National Recreation Area are generally considered its southern extent. To the west are the 

Spring Mountains, which include Mt. Charleston, the region's highest peak at 11,918 feet. 

Several smaller ranges line the eastern rim of the valley, including the Muddy Mountains, 

the Black Mountains and the Eldorado Range. 

Official weather observations began in 1937 at what is now Nellis Air Force Base. In 

late 1948, the U.S. Weather Bureau moved to McCarran Field, now McCarran 

International Airport. McCarran is located 7 miles south of downtown Las Vegas. For 

most of the Las Vegas metropolitan area, the valley floor slopes downward from west to 

east. This affects the local climatology significantly in terms of driving variations in wind, 

precipitation, and storm run off. 
2

II. General Climatic Summary 

The four seasons are actually well defined in Las Vegas, although they differ from the 

traditional view of seasonal variation. Summers display classic desert southwest 

characteristics. Daily high temperatures typically exceed 100 degrees with lows in the 70s. 

The summer heat is tempered somewhat by the extremely low relative humidities. 

However, it is not uncommon for humidity to increase markedly for several weeks each 

summer in association with a moist "monsoonal flow" from the south, typically during July 

and August. Aside from increasing the discomfort level, these moist winds also support the 

development of spectacular desert thunderstorms which are frequently associated with 

significant flash flooding and/or strong downburst winds. On average, sunny days are 

recorded 85 percent of the time and there are over 300 days per year with no measurable 

rainfall. 

Winters on the whole, are mild and pleasant. Afternoon temperatures average near 60 

degrees and skies are mostly clear. Pacific storms occasionally produce rainfall in Las 

Vegas, but in general, the Sierra Nevada Mountains of eastern California and the Spring 

Mountains immediately west of the Las Vegas Valley act as effective barriers to moisture. 

Snow accumulation is rare in Las Vegas. Flurries are observed once or twice during most 

winters, but snowfall of an inch or more occurs only once every four to five years. Freezing 

temperatures do occur with some regularity each year with a 30 year average of 24 days 

with low temperatures at or below 32 degrees. Snowfall is rather common in the mountains 

surrounding Las Vegas with the Spring Mountains receiving between 5 and 10 feet 

annually. 

The spring and fall seasons are generally considered ideal. Although rather sharp 

temperature changes can occur during these months, outdoor activities are seldom 

hampered. 

 

Strong winds are arguably the most persistent and provoking weather hazard experienced 

in the area. Winds over 50 mph are infrequent but can occur with some of the more 

vigorous storms. Winter and spring wind events often generate widespread areas of 

blowing dust and sand. Strong wind episodes in the summertime are usually connected 

with thunderstorms, and are thus more isolated and localized. Prevailing wind direction is 

typically either southwest or north, unless associated with a thunderstorm outflow. 

MONTHLY NORMALS 
3

 LAS VEGAS NEVADA 

 

PERIOD OF RECORD: 1971-2000 

 

 SEASON TOTAL 

 MAX MIN AVG HDD CDD PCPN HDD CDD 

JAN 57.1 36.8 47.0 574 0 0.59 1520 0 

FEB 63.0 41.4 52.2 375 0 0.69 1895 0 

MAR 69.5 47.0 58.3 244 20 0.59 2139 20 

APR 78.1 53.9 66.0 83 98 0.15 2222 118 

MAY 87.8 62.9 75.4 16 323 0.24 2238 441 

JUN 98.9 72.3 85.6 0 602 0.08 2238 1043 

JUL 104.1 78.2 91.2 0 796 0.44 0 1839 

AUG 101.8 76.7 89.3 0 739 0.45 0 2578 

SEP 93.8 68.8 81.3 0 474 0.31 0 3052 

OCT 80.8 56.5 68.7 57 157 0.24 57 3209 

NOV 66.0 44.0 55.0 318 4 0.31 375 3213 

DEC 57.3 36.6 47.0 571 0 0.40 946 3213 

ANNUAL 79.9 56.3 68.1 2238 3213 4.49 

ALL UNITS OF MEASUREMENT IN THIS DOCUMENT ARE DEFINED AS FOLLOWS: 

TEMPERATURES ARE IN DEGREES FAHRENHEIT 

PRECIPITATION IS IN INCHES 

EXTREMES AND RECORDS ARE CONSIDERED THE SAME THING 

HEATING AND COOLING DEGREE DAYS ARE BASED ON A 65 DEGREE STANDARD 

(e.g. a mean temp for the day of 75 would equate to 10 cooling degree days 

or a mean temp of 50 degrees would equate to 15 heating degree days) 

THE HEATING DEGREE DAY SEASON EXTENDS FROM JULY 1 THROUGH JUNE 30 

THE COOLING DEGREE DAY SEASON EXTENDS FROM JANUARY 1 THROUGH DECEMBER 31 
4

MONTHLY EXTREMES (RECORDS)

MONTH HIGH LAST LOW LAST LOW LAST HIGH LAST 

 MAX OCCURRED MIN OCCURRED MAX OCCURRED MIN OCCURRED 

JANUARY 77 01/26/75 8# 01/13/63 28# 01/21/37 58 01/20/99 

FEBRUARY 87 02/26/86 16 02/07/89 34 02/06/89 59 02/26/89 

MARCH 92 03/21/04 19 03/02/39 42 03/01/71 71 03/23/04 

 

APRIL 99 04/27/00 31 04/02/75 48* 04/02/97 74 04/24/43 

MAY 109* 05/28/03 38 05/03/42 60 05/08/79 89 05/28/03 

JUNE 116 06/15/40 48* 06/06/93 67 06/04/99 89 06/30/94 

JULY 117# 07/24/42 56 07/21/40 81 07/08/92 92#* 07/23/03 

AUGUST 116 08/03/79 54 08/03/37 74 08/18/83 90 08/12/03 

SEPTEMBER 113 09/01/50 43 09/27/48 67 09/18/65 84 09/01/02 

OCTOBER 103 10/01/78 26 10/30/71 50 10/29/71 73 10/05/88 

NOVEMBER 87 11/01/88 15 11/24/38 42 11/16/64 62 11/12/83 

DECEMBER 78 12/02/40 11 12/23/90 32 12/10/72 57 12/24/55 

 # - EXTREMES FOR ENTIRE PERIOD OF RECORD (1937-2004) 

 * - ALSO IN PREVIOUS YEARS 

PERIOD OF RECORD INCLUDES TWO MAJOR LOCATION MOVES ON DECEMBER 18TH 1948 FROM 

WHAT IS NOW KNOWN AS NELLIS AIR FORCE BASE (36 DEGREES 14 MINUTES NORTH - 

115 DEGREES 02 MINUTES WEST) TO MCCARRAN INTERNATIONAL AIRPORT (36 DEGREES 05 

MINUTES NORTH - 115 DEGREES 10 MINUTES WEST) AND FINALLY TO ITS CURRENT LOCATION 

AT MCCARRAN INTERNATIONAL AIRPORT (36 DEGREES 04 MINUTES 44 SECONDS NORTH - 115 

DEGREES 09 MINUTES 19 SECONDS WEST). 
5

 JANUARY

TEMPERATURE EXTREMES - 1937 TO 2004 

DAILY NORMALS - 1971 TO 2000 

 HI LAST LO LAST LO LAST HI LAST NORMAL 

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN 

 1 69 1981 21 1954 39 1979 47 1996 56/35 

 2 69 1997* 13 1974 31 1974 52 1997 56/36 

 3 69 1997 12 1974 32 1974 47 1998 56/36 

 4 67 1981 14 1970 33 1974 45 1981 56/36 

 5 71 2003 12 1950 35 1971 46 1986 56/36 

 6 74 1962 12 1971 35 1971 50 2003 56/36 

 7 75 1962 15 1971 36 1971 52 1962 56/36 

 8 74 1962 19 1937 28# 1937 47 1993 56/36 

 9 72 1945 11 1937 31 1937 53 2005 56/36 

 10 69 1996 11 1937 35 1949 54 2005 56/36 

 

 11 73 1938 14 1937 36 1949 48 1980 56/36 

 12 71 1986 14 1963 29 1963 51 1980 56/36 

 13 73 1945 8# 1963 31 1963 48 1980 56/36 

 14 74 1945 14 1963 42 1997* 50 1980 57/36 

 15 73 1945 20 1962 38 1997 44 1996* 57/36 

 16 73 1976 23 1964 38 1949 50 2000 57/37 

 17 72 1976 20 1949 36 1949 52 2000 57/37 

 18 72 1971 20 1949 40 1949 51 2000 57/37 

 19 74 1971 10 1943 35 1949 51 1998 57/37 

 20 72 1986 17 1937 33 1937 (58) 1999 57/37 

 21 69* 2000 13 1937 28# 1937 54 2000 57/37 

 22 74 1948 9 1937 31 1937 50 1997 58/37 

 23 76 1948 14 1937 35 1937 47 1997 58/37 

 24 75 1948 15 1937 31 1937 56 2000 58/38 

 25 75 1953 8# 1937 35 1949 56 2000 58/38 

 26 (77) 1975 10 1937 39 1949 52 1956 58/38 

 

 27 73 1971 12 1937 39 1949 48 1941 59/38 

 28 71 1971 18 1937 35 1979 48 1980 59/38 

 29 71 1976 17 1979 38 1979 50 1997 59/38 

 30 72 1971 18 1949 38 1979 54 1963 59/39 

 31 75 2003 19 1949 37 1979 55 1963 60/39 

 # - INDICATES THE EXTREME TEMPERATURE FOR ENTIRE PERIOD OF RECORD. 

 ( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS. 

 
6

 FEBRUARY 

TEMPERATURE EXTREMES - 1937 TO 2004 

DAILY NORMALS - 1971 TO 2000 

 

 HI LAST LO LAST LO LAST HI LAST NORMAL 

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN 

 1 81 2003 17 1937 37 1985 58 1963 60/39 

 2 77 1995 22 1951 35 1985 50 1952 60/39 

 3 75 1995 19 1972 38 1939 47 1992 60/39 

 4 76 1953 19 1948 43 1949 51 1976 61/39 

 5 78 1947 18 1939 39 1989 49 1996 61/40 

 6 78 1963 19 1989 (34) 1989 55 1950 61/40 

 7 77 1963 (16) 1989 36 1989 48 1993 61/40 

 8 76 1996 25 1949 36 1989 50 1976 62/40 

 9 77 1951 19 1946 45 1939 52 2000 62/40 

 10 74 1951 19 1946 39 1939 54 1962 62/41 

 

 11 79 1971 22 1939 44 1948 53 1962 62/41 

 12 75 1954 22 1965 46 1949 51 1996 63/41 

 13 79 1957 20 1949 42 1949 52 1954 63/41 

 14 78 1957 18 1949 42 1990 56 2000 63/41 

 15 77 1977 22 1949 45 1990 50 1945 63/41 

 16 79 1996 24 1949 46 1956 55 1991 63/42 

 17 81 1996 21 1956 49 1956 52 1996 64/42 

 18 81 1977 17 1938 48 1938 58 1986 64/42 

 19 82 1981 25 1952 45 1955 58 1986 64/42 

 20 79 1995 23 1942 43 1955 55 1996 64/42 

 21 80 1977 21 1955 47 1955 54 1996 64/43 

 22 77 1961 20 1953 51 1955 54 1995* 65/43 

 23 79 2002 25 1953 47 1944 53 1957 65/43 

 24 82 1989 24 1955 49 1987 51 2002 65/43 

 25 85 1986 26 1960 40 1987 57 1989 65/43 

 26 (87) 1986 28 1971 40 1944 (59) 1989 65/44 

 

 27 83 1986 19 1971 39 1962 56 1940 65/44 

 28 82 1986 19 1962 45 1962 51 1978 66/44 

 29 76 1972 33 1996 47 1960 58 1972 66/44 

 ( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS. 
7

MARCH 

TEMPERATURE EXTREMES - 1937 TO 2004 

DAILY NORMALS - 1971 TO 2000 

 HI LAST LO LAST LO LAST HI LAST NORMAL 

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN 

 1 82 1986 23 1962 (42) 1971 56 1974 66/44 

 2 82 1967 (19) 1939 47 1951 57 1990 66/44 

 3 85 1972 23 1971 46 1976 60 1999 66/44 

 4 84 1972 25 1966 50 1966 58 1972 67/45 

 5 84 1972 26 1948 51 1976 53 1986 67/45 

 6 85 1972 24 1939 51 1964 54 1987 67/45 

 7 84 1972 27 1940 49 1964 53 1994 67/45 

 8 87 1989 26 1942 43 1952 62 1989 68/45 

 9 87 1989 27 1964 54 1969 61 1954 68/46 

 10 89 1972 29 1962 44 1969 59 1982 68/46 

 

 11 86 1989 26 1948 47 1958 65 1989 68/46 

 12 86 1989 27 1940 51 1990 (66) 1989 68/46 

 13 84 1966 25 1956 47 1969 57 1989 69/47 

 14 84 2004 27 1962 49 1944 64 2003 69/47 

 15 84 1994 26 1962 48 1991 59 2004 69/47 

 16 84 1994 31 1991 52 1963 62 1997 69/47 

 17 87 1947 30 1955 55 1963 64 1994 70/47 

 18 88 1972 30 1954 55 1982 64 1974 70/47 

 19 88 1939 31 1937 51 1979 58 2004* 70/48 

 20 90 2004 34 1964 49 1991 58 2004* 70/48 

 21 (92) 2004 26 1955 53 1952 62 2004 71/48 

 22 91 2004 28 1948 49 1973 61 2004 71/48 

 23 89 2004* 32 1938 48 1964 71 2004 71/48 

 24 89 1940 34 1957 53 1995 66 1998 71/49 

 25 87 1981 31 1964 50 1977 63 2001 72/49 

 26 87 1947 34 1948 53 1975 65 1971 72/49 

 27 88 1988 33 1975 49 1991 60 1990 72/49 

 28 89 1986 31 1975 48 1975 57 1986 73/49 

 29 86 1966 33 1975 50 1998 60 1986 73/50 

 30 88 2004* 33 1987 57 1938 59 1999 73/50 

 31 91 1966 25 1938 48 1949 58 1986 73/50 

 ( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS. 

 
8

APRIL

TEMPERATURE EXTREMES - 1937 TO 2004 

DAILY NORMALS - 1971 TO 2000 

 HI LAST LO LAST LO LAST HI LAST NORMAL 

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN 

 1 92 1966 35 1948 55 1980 62 2003* 74/50 

 2 95 1966 (31) 1975 (48) 1997 58 1966 74/51 

 3 91 1961 (31) 1955 52 1965 60 2002 74/51 

 4 94 1961 (31) 1945 51 1965 63 1989 75/51 

 5 94 1960 32 1945 59 1965 63 1972 75/51 

 6 95 1989 35 1945 60 1983 65 1991 75/51 

 7 98 1989 36 1939 53 1958 62 1960 76/52 

 8 98 1989 39 1983 56 1965 64 2000 76/52 

 9 95 1989 32 1953 54 1943 65 2000 76/52 

 10 91 1985 38 1950 55 1965 70 2002 76/52 

 

 11 88 2002 35 1965 54 1965 64 1989 77/53 

 12 91 1990 32 1967 (48) 1965 72 2002 77/53 

 13 93 1990 35 1967 58 1972 68 2000 77/53 

 14 95 2002 38 1983 57 1939 66 2002 78/53 

 15 97 1947 34 1939 56 1998 64 1994 78/54 

 16 95 1989 39 1998* 55 1976 66 1962 78/54 

 17 97 1989 40 1976 56 1963 69 1989 79/54 

 18 98 1946 35 1963 60 1995 68 1994 79/54 

 19 98 1938 35 1968 60 1972 65 1994 79/55 

 20 97 1994 34 1966 62 1967 69 1989 79/55 

 21 98 1950 37 1966 52 1957 71 1989 80/55 

 22 97 1939 33 1963 57 2003 70 1950 80/56 

 23 98 1949 36 1937 58 1999 62 1986 80/56 

 24 (99) 1946 38 1937 58 1999* (74) 1943 81/56 

 25 96 1946 37 1960 64 1971 69 1996 81/56 

 26 97 1996 42 1967 60 1963 67 1981 81/57 

 27 (99)* 2000 39 1984 59 1970 70 1996 82/57 

 28 95 1992 39 1955 55 1970 71 1943 82/57 

 29 96 1981 35 1970 56 1999 67 1986 82/58 

 30 (99) 1981 38 1967 56 1999 70 1992 82/58 

 ( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS. 
9

MAY 

TEMPERATURE EXTREMES - 1937 TO 2004 

DAILY NORMALS - 1971 TO 2000 

 HI LAST LO LAST LO LAST HI LAST NORMAL 

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN 

 1 102 1947 41 1967 62 1955 67 1965 83/58 

 2 107 1947 43 1955 65 1955 72 1981 83/59 

 3 108 1947 (38) 1942 67 1950 70 1985 83/59 

 4 108 1947 40 1959 67 1964 74 2004 84/59 

 5 108 1947 40 1950 65 1973 75 2004 84/59 

 6 103 1947 43 1964 63 1964 71 2000 84/60 

 7 102 1989 41 1938 62 1964 73 2004* 85/60 

 8 102 1989 42 1964 (60) 1979 74 1989 85/60 

 9 100 2001 42 1938 69 2003 70 2001 85/61 

 10 102 1940 41 1948 68 1991 75 2001 86/61 

 

 11 103 1960 47 1938 63 1989 70 2001* 86/61 

 12 104 1996 45 1963 67 1961 74 1993 86/62 

 13 103 1996 45 1953 66 1998 75 1994 87/62 

 14 106 1937 45 1998 66 1962 77 1997 87/62 

 15 107 1937 44 1968 61 1951 74 1997 87/63 

 16 107 1937 43 1953 67 1962 74 1997 88/63 

 17 102 1937 43 1962 71 1977 78 1997 88/63 

 18 103 1973 45 1977 72 1949 73 2002 88/64 

 19 102 1958 47 1974 63 1974 72 1979 89/64 

 20 102 1984 46 1975 69 1975 74 1968 89/64 

 21 104 1942 42 1975 66 1957 76 2001 89/64 

 22 108 2000 45 1975 73 1971 73 1989 90/65 

 23 107 2000 48 1980 69 1957 77 2000 90/65 

 24 105 2001 46 1939 61 1965 81 2000 91/65 

 25 105 2001 47 1977 69 1996 77 2001 91/66 

 26 (109) 1951 50 1980 74 1998* 79 2001 91/66 

 27 108 1974 44 1953 73 1971 80 2001 92/66 

 28 (109) 2003 50 1971 64 1971 (89) 2003 92/67 

 29 108 1984 46 1953 66 1971 83 2000 93/67 

 30 106 2002* 48 1971 74 1988 83 2003 93/67 

 31 104 2002* 47 1937 68 1991 82 1997 93/68 

 

 ( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS. 
10

JUNE

TEMPERATURE EXTREMES - 1937 TO 2004 

DAILY NORMALS - 1971 TO 2000 

 HI LAST LO LAST LO LAST HI LAST NORMAL 

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN 

 1 107 2001 50 1991 74 1955 80 2002 94/68 

 2 107 2003 49 1955 76 1999 80 2003* 94/68 

 3 107 1957 53 1961 69 1949 81 2003 95/69 

 4 109 1996* 50 1999 (67) 1999 80 2003 95/69 

 5 108 1996 51 1993 75 1993 83 2003 96/69 

 6 108 2002* (48) 1993 70 1993 80 2004 96/70 

 7 108 1955 52 1954 68 1995 85 2002 96/70 

 8 111 1955 52 1995 76 1995 81 2002 97/70 

 9 111 1985 50 1950 75 1954 83 2001 97/71 

 10 108 1996 51 1954 75 1957 80 2001 97/71 

 

 11 109 1956 55 1976 83 1976 81 1996 98/71 

 12 112 1940 52 1937 82 1943 81 1994 98/71 

 13 114 1940 49 1938 77 1997 82 1985 98/72 

 14 115 1940 55 1943 75 1997 83 1979 99/72 

 15 (116) 1940 52 1962 80 1962 83 1989 99/72 

 16 114 1940 53 1944 70 1995 87 2000 99/73 

 17 113 1940 50 1944 79 1995 80 2000* 100/73 

 18 115 1940 49 1939 82 1979 82 2000 100/73 

 19 114 1940 56 1939 85 1975 83 1997 100/73 

 20 113 1961 53 1939 86 1975 84 1996 101/74 

 21 111 1954 53 1941 86 1947 83 1999 101/74 

 22 115 1954 56 1944 91 1976 84 2001 101/74 

 23 113 1959 55 1944 86 1963 83 1954 101/74 

 24 113 1961 56 1963 86 2003 83 1981 101/75 

 25 115 1970 55 1941 86 1975 86 1974 102/75 

 26 114 1970 56 1944 81 1965 86 1994 102/75 

 27 114 1977 59 1941 83 1991 86 1994 102/75 

 28 115 1994 55 1941 91 1991 87 1994 102/75 

 29 115 1994 60 1941 85 1938 87 1977 103/76 

 30 115 1994 60 1970 83 1982 (89) 1994 103/76 

 ( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS. 
11

 JULY 

TEMPERATURE EXTREMES - 1937 TO 2004 

DAILY NORMALS - 1971 TO 2000 

 HI LAST LO LAST LO LAST HI LAST NORMAL 

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN 

 1 116 1972 58 1938 88 1980 90 1994 103/76 

 2 115 1950 62 1943 93 1980 89 2002 103/76 

 3 116 1937 60 1943 (81) 1961 89 1996 103/77 

 4 115 1985 60 1941 89 1949 85 1986 103/77 

 5 116 1985 60 1938 89 1937 86 1981 103/77 

 6 115 1989 63 1939 84 1950 90 1957 104/77 

 7 114 1989 62 1939 92 1950 83 1996* 104/77 

 8 113 1989 60 1938 (81) 1992 91 1989 104/78 

 9 113 1943 63 1938 89 1999 86 1996 104/78 

 10 114 2003* 64 1948 91 1974 89 2002 104/78 

 

 11 116 1959 62 1944 87 1989 89 2002 104/78 

 12 114 2003* 62 1937 87 1999 85 1985 104/78 

 13 115 1939 64 1944 85 1999 89 2003* 104/78 

 14 116 1972 63 1952 94 1953 92# 2002 104/78 

 15 114 1949 62 1944 89 1974 86 2002 104/78 

 16 116 1998 65 1944 91 1953 87 1977 104/78 

 17 115 1959 62 1940 90 1953 87 1997 105/79 

 18 115 1979 59 1940 85 1985 88 2003 105/79 

 

 19 115 1989 (56) 1937 90 1943 84 1990 105/79 

 20 113 1959 58 1940 (81) 1979 88 1989 105/79 

 21 113 1942 (56) 1940 86 1986 87 2003 105/79 

 22 114 1937 62 1943 85 1984 92# 2003 105/79 

 23 115 1942 61 1938 89 1998* 92# 2003 105/79 

 24 117# 1942 64 1957 86 1965 87 2002 105/79 

 25 115 1942 66 1944 87 1954 86 1980 104/79 

 26 116 1943 65 1944 91 1950 87 2000 104/79 

 

 27 115 1943 63 1944 90 1969 86 1995 104/79 

 28 114 1995 61 1984 84 1984 87 2003* 104/79 

 29 115 1995 64 1984 92 1999 88 1980 104/79 

 30 114 1978 64 1941 87 1976 87 1972 104/79 

 31 115 1978 65 1940 92 2003 86 1995 104/79 

 # - INDICATES THE EXTREME TEMPERATURE FOR ENTIRE PERIOD OF RECORD. 

 ( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS. 
12

 AUGUST 

TEMPERATURE EXTREMES - 1937 TO 2004 

DAILY NORMALS 1971 TO 2000 

 HI LAST LO LAST LO LAST HI LAST NORMAL 

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN 

 1 (116) 1979 66 1940 86 2003 86 2000* 104/79 

 2 115 1979 55 1937 94 1991 88 2000* 104/79 

 3 (116) 1979 (54) 1937 81 1951 87 1980 104/79 

 4 114 1979 58 1937 82 1970 86 1995 104/78 

 5 113 1969 63 1953 89 1992 85 2000* 104/78 

 6 114 1978 64 1950 95 1963 88 1994 103/78 

 7 111 1994 63 1950 92 1963 88 1997* 103/78 

 8 114 1978 64 1957 91 1938 88 1995 103/78 

 9 114 1940 65 1951 87 1989 86 1975 103/78 

 10 115 1940 60 1937 82 1983 89 1995 103/78 

 

 11 (116) 1940 60 1948 86 1991 87 2003 103/78 

 12 115 1937 60 1949 82 1979 (90) 2003 103/78 

 13 113 1937 60 1949 83 1972 87 2000 103/77 

 14 111 2002 64 1984 89 1972 86 2003 102/77 

 15 111 2002 60 1938 85 1990 84 1992 102/77 

 16 113 1939 58 1938 84 1943 85 1992 102/77 

 17 111 1939 55 1938 (74) 1983 86 1994 102/77 

 18 111 1992 60 1944 (74) 1983 85 1973 102/77 

 19 111 1992 60 1938 81 1983 85 1992 101/76 

 20 110 1950 55 1938 78 1957 87 1992 101/76 

 21 109 1940 63 1957 (74) 1957 83 1994 101/76 

 22 110 1939 60 1968 86 1968 81 1986 101/76 

 23 109 1998* 56 1947 88 1968 85 1998 101/76 

 24 110 1985 56 1968 80 1982 84 1998* 100/75 

 25 110 1985 59 1944 84 1982 83 1998* 100/75 

 26 109 2001 55 1943 91 1982 82 1998 100/75 

 27 109 2001 60 1943 90 1972 82 1994 100/75 

 28 110 1944 58 1945 84 1951 80 1958 100/75 

 29 110 1948 57 1947 82 2000 85 1998 99/74 

 30 112 1948 55 1947 80 2000 86 1981 99/74 

 31 112 1948 55 1942 86 1991 83 1985 99/74 

 

 ( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS
13

SEPTEMBER

 

TEMPERATURE EXTREMES - 1937 TO 2004 

DAILY NORMALS - 1971 TO 2000 

 HI LAST LO LAST LO LAST HI LAST NORMAL 

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN 

 1 (113) 1950 57 1942 80 1960 (84) 2002 99/74 

 2 110 1950 56 1964 79 1940 83 1958 98/73 

 3 108 1982 55 1946 78 1997 80 1969 98/73 

 4 111 1947 57 1941 79 1939 83 2002* 98/73 

 5 109 1977 52 1940 80 1970 82 1995 97/72 

 6 110 1955 54 1970 70 1939 80 1989 97/72 

 7 108 1977 56 1938 79 1950 80 2003* 97/72 

 8 110 1979 56 1965 84 1941 80 1995 96/71 

 9 108 1944 50 1941 81 1975 81 1999 96/71 

 10 108 1945 48 1941 79 1976 81 1994 96/71 

 

 11 109 1945 54 1952 77 1985 80 1960 96/71 

 12 108 1948 53 1985 80 1988 82 1993 95/70 

 13 109 1948 52 1952 83 1994 80 1960 95/70 

 14 107 1945 50 1941 82 1978 80 1960 95/70 

 15 107 2000* 49 1941 83 1986 77 1955 94/69 

 16 107 1937 49 1941 80 1982 79 2003* 94/69 

 17 108 1937 53 1941 71 1965 76 1944 93/68 

 18 108 1937 53 1965 (67) 1965 79 1980 93/68 

 19 104 1962 47 1965 70 1985 78 1962 93/68 

 20 103 1951 46 1965 72 1952 75 1981 92/67 

 21 104 1943 49 1978 75 1988 77 2000 92/67 

 22 104 1949 51 1944 72 1941 73 1992 92/67 

 23 104 1947 46 1941 73 1986 76 1992 91/66 

 24 106 1947 45 1941 69 1986 79 1992 91/66 

 25 106 1947 47 1945 68 1939 82 2002 90/65 

 26 105 1947 45 1948 75 1986 73 2002 90/65 

 

 27 104 1947 (43) 1948 68 1986 73 2002 90/65 

 28 103 1978 48 1971 68 1986 74 1994 89/64 

 29 102 1978 51 1940 75 1959 72 1957 89/64 

 30 101 1978 47 1982 69 1982 74 1969 88/63 

 ( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS 
14

OCTOBER

TEMPERATURE EXTREMES - 1937 TO 2004 

DAILY NORMALS - 1971 TO 2000 

 HI LAST LO LAST LO LAST HI LAST NORMAL 

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN 

 1 (103) 1978 42 1971 69 1971 (75) 2003 88/63 

 2 100 1980 43 1971 59 2002 74 1997 88/63 

 3 99 1987 44 1950 71 1969 72 2003 87/62 

 4 100 1947 43 1940 69 1969 69 1979 87/62 

 5 99 1980 41 1937 65 1946 73 1988 86/61 

 6 98 1980 43 1969 71 1946 72 1990 86/61 

 7 99 1978 36 1941 68 1938 73 1960 85/60 

 8 98 1964 41 1941 59 1961 68 1991 85/60 

 9 97 1996* 41 1949 61 1961 69 1963 84/60 

 10 97 1996* 40 1961 64 1960 73 2003 84/59 

 

 11 95 1991 43 1961 65 1997 70 1980 83/59 

 12 97 1950 38 1946 63 1947 71 1991 83/58 

 13 95 1992 41 1946 66 1981 64 2003 82/58 

 14 96 1950 42 1981 65 1966 69 1992 82/57 

 15 94 1958 43 1966 66 1994 70 1950 81/57 

 16 96 1991 42 1984 60 1971 66 1950 81/57 

 17 94 1991 38 1938 57 1971 67 1991 81/56 

 18 95 1958 35 1938 60 1971 63 1991 80/56 

 19 96 1940 35 1946 57 1949 70 1958 80/55 

 20 95 1940 36 1943 58 1949 64 2003* 79/55 

 21 94 2003 32 1949 59 2004 65 2001 78/54 

 22 92 2003 38 1996 54 1953 64 2003* 78/54 

 23 94 1959 37 1953 60 1953 63 2003* 77/53 

 24 92 1959 36 1953 60 1956 64 1983 77/53 

 25 92 1937 32 1945 64 1954 61 1950 76/53 

 26 90 1937 35 1945 56 1951 60 1950 76/52 

 27 92 1937 35 1939 58 1996 61 1950 75/52 

 28 91 1937 32 1970 53 1996 66 1999* 75/51 

 29 90 1950 30 1971 (50) 1971 65 1988 74/51 

 30 87 1937 (26) 1971 52 1971 66 1950 74/50 

 31 86 1988 30 1971 51 1961 62 1990 73/50 

 ( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS. 
15

NOVEMBER

TEMPERATURE EXTREMES - 1937 TO 2004 

DAILY NORMALS - 1971 TO 2000 

 HI LAST LO LAST LO LAST HI LAST NORMAL 

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN 

 1 (87) 1988 33 1971 59 1956 60 1988 73/49 

 2 84 1937 28 1943 56 1974 57 1953 72/49 

 3 85 1976 26 1943 52 1994 58 1960 72/49 

 4 85 1988 26 1956 56 1957 59 2001 71/48 

 5 84 1980 28 1940 50 1957 60 2001 71/48 

 6 85 1988 27 1940 57 1938 57 1970 70/47 

 7 83 1991 23 1938 60 1986 57 2001 70/47 

 8 83 1950 24 1938 55 1946 (62) 2002 69/47 

 9 82 1978 26 1945 55 1966 58 2002 69/46 

 10 81 1990 27 1948 52 1950 60 1978 68/46 

 

 11 85 1973 24 1950 51 2000 58 1980 68/45 

 12 81 1973 24 1950 48 1985 (62) 1983 67/45 

 13 81 1953 16 1938 49 1985 (62) 1981 67/45 

 14 81 1995 22 1938 45 1964 61 1981 66/44 

 15 82 1981 24 1938 47 1964 54 1942 66/44 

 16 78 1977 24 1938 (42) 1964 51 1981 65/44 

 17 79 1981 28 1958 43 1964 58 1999 65/43 

 18 79 1949 23 1958 48 1964 58 1942 65/43 

 19 78 1976 24 1985 46 1985 55 1950 64/43 

 20 76 1976 23 1956 46 1953 54 1946 64/42 

 21 77 1976 24 1945 48 2004 57 1996 63/42 

 22 77 1976 24 1941 50 2004 55 1996 63/42 

 23 76 1995* 24 1941 48 1952 50 1965 63/41 

 24 81 1949 (15) 1938 47 2003 50 1998* 62/41 

 25 76 1970 18 1938 47 1988 48 1985 62/41 

 26 75 1997* 24 1944 49 1984 50 1989 62/40 

 

 27 79 1954 21 1952 45 1984 48 1977 61/40 

 28 73 1977 19 1938 48 1976 48 1939 61/40 

 29 74 2000 21 1948 49 2004* 47 2002* 61/40 

 30 79 1980 22 1948 47 2004 50 1961 60/39 

 ( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS 
16

 DECEMBER

TEMPERATURE EXTREMES - 1937 TO 2004 

DAILY NORMALS - 1971 TO 2000 

 HI LAST LO LAST LO LAST HI LAST NORMAL 

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN 

 1 74 1940 26 1957 51 2004* 52 1999 60/39 

 2 (78) 1940 24 1948 51 1991 54 1966 60/39 

 3 77 1980 23 1948 48 1984 46 1966 60/39 

 4 76 1939 24 1948 50 1992 52 1980 59/38 

 5 76 1938 18 1948 42 1972 52 1956 59/38 

 6 76 1938 23 1942 41 1978 55 1966 59/38 

 7 76 1938 21 1948 39 1978 56 2003 59/38 

 8 77 1939 23 1978 38 1978 48 1988 58/37 

 9 71 1975 16 1956 37 1972 51 1970 58/37 

 10 74 1950 20 1972 (32) 1972 52 1996 58/37 

 

 11 72 1939 21 1972 36 1972 50 1996 58/37 

 12 74 1958 15 1949 34 1972 51 1995 58/37 

 13 70 1952 19 1949 35 1967 55 1995 57/37 

 14 72 1942 16 1945 36 1967 46 1995 57/36 

 15 75 1980 14 1940 40 1987 54 1998 57/36 

 16 74 1980 23 1964 41 1940 49 2002 57/36 

 17 71 1942 20 1945 43 1967 46 1952 57/36 

 18 72 1939 22 1945 42 1984 48 1962 57/36 

 19 68 1942 22 1945 42 1970 48 1943 56/36 

 20 73 1981 14 1945 42 1990 49 1943 56/36 

 21 68 1950 20 1990 35 1990 51 1981 56/36 

 22 68 1950 12 1990 34 1990 49 1982 56/36 

 23 74 1955 (11) 1990 33 1990 44 2003* 56/36 

 24 70 1942 14 1990 39 1990 (57) 1955 56/36 

 25 69 1964 17 1948 40 1962 50 1955 56/36 

 26 73 1980 20 1962 39 1941 48 1983 56/36 

 27 70 1980 19 1988 36 1941 49 1955 56/35 

 28 73 1980 20 1954 42 1988 47 1980 56/35 

 29 73 1980 23 1962 43 1982 52 1951 56/35 

 30 70 1980 15 1990 40 1990 48 1996* 56/35 

 31 74 1995 18 1990 45 1975 48 2004 56/36 

 

 ( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS 
17

TOP 10 WETTEST AND DRIEST YEARS AND OVERALL MONTHS 

 

 10 WETTEST MONTHS 10 DRIEST MONTHS

 * 4.80.....MAR 1992 0.00 MANY TIMES 

 * 3.39.....SEP 1939 

 * 3.00.....JAN 1995 

 * 2.89.....FEB 1998 

 * 2.59.....AUG 1957 

 2.52.....FEB 1993 

 2.49.....FEB 1976 

 * 2.48.....JUL 1984 

 * 2.44.....APR 1965 

 2.25.....FEB 1980 

 

 * INDICATES WETTEST ALL TIME FOR THAT PARTICULAR MONTH 

 

 10 WETTEST YEARS 10 DRIEST YEARS

 10.72.....1941 0.56.....1953 

 9.88.....1992 0.76.....1948# 

 7.96.....1965 1.11.....1968 

 7.76.....2004 1.12.....1964 

 7.65.....1978 1.27.....1985 

 7.35.....1998 1.44.....2002 

 7.30.....1939 1.45.....1962 

 6.86.....2003 1.91.....1966 

 6.85.....1984 2.04.....1956 

 6.79.....1979 2.11.....1989 

 # INTERRUPTED DURING MOVE 
18

TOP 10 WETTEST AND DRIEST MONTHS BY MONTH

 10 WETTEST MONTHS (BY MONTH) 10 DRIEST MONTHS (BY MONTH)

 JANUARY JANUARY 

 

 3.00.....1995 0.00.....1976 (MOST RECENT) 

 2.41.....1949 TRACE....2002 (MOST RECENT) 

 2.18.....1979 

 2.07.....2005 

 2.00.....1974 

 1.63.....1993 

 1.57.....1969 

 1.55.....1939 

 1.45.....1980 

 1.40.....1955 

 FEBRUARY FEBRUARY

 

 2.89.....1998 0.00.....1977 (MOST RECENT) 

 2.52.....1993 TRACE....2002 (MOST RECENT) 

 2.49.....1976 

 2.25.....1980 

 2.21.....2001 

 2.13.....2003 

 1.64.....1973 

 1.59.....2000 

 1.58.....1941 

 1.51.....1978 

 

 MARCH MARCH

 

 4.80.....1992 0.00.....1997 (MOST RECENT) 

 1.83.....1973 TRACE....1999 (MOST RECENT) 

 1.63.....1941 

 1.58.....1945 

 1.50.....1952 

 1.44.....1981 

 1.17.....1938 

 1.13.....1978 

 1.07.....1975 

 1.03.....1998 

 

 APRIL APRIL 

 2.44.....1965 0.00.....2002/1996/1962 

 1.68.....1941 TRACE....2000 (MOST RECENT) 

 0.92.....2004 

 0.85.....1943 

 0.76.....1988 

 0.73.....1999 

 0.64.....1958 

 0.57.....1952 

 0.55.....1939 

 0.55.....1957 
19

10 WETTEST AND DRIEST MONTHS BY MONTH (CONT)

 MAY MAY

 0.96.....1969 0.00.....2004 (MOST RECENT) 

 0.90.....1987 TRACE....2000 (MOST RECENT) 

 0.84.....1971 

 0.72.....1977 

 0.64.....1989 

 0.54.....1978 

 0.50.....1981 

 0.46.....1972 

 0.40.....1965 

 0.35.....1979/1975 

 

 

 JUNE JUNE

 0.97.....1990 0.00.....2003 (MOST RECENT) 

 0.82.....1967 TRACE....2004 (MOST RECENT) 

 0.39.....1955 

 0.32.....1972 

 0.31.....1968 

 0.23.....1938 

 0.23.....1969 

 0.22.....1984 

 0.19.....1991 

 0.18.....1970 

 

 JULY JULY 

 2.48.....1984 0.00.....1993 (MOST RECENT) 

 2.18.....1999 TRACE....2000 (MOST RECENT) 

 1.95.....1976 

 1.68.....1945 

 1.64.....1956 

 1.61.....1954 

 1.55.....1955 

 1.34.....1950 

 1.08.....2003 

 0.93.....1941 

 

 AUGUST AUGUST

 2.59.....1957 0.00.....2002 (MOST RECENT) 

 2.12.....1979 TRACE....1996 (MOST RECENT) 

 1.79.....1970 

 1.77.....1942 

 1.75.....1941 

 1.74.....1955 

 1.38.....1977 

 1.25.....1983 

 0.99.....1984 

 0.90.....1971 
20

10 WETTEST AND DRIEST MONTHS BY MONTH (CONT)

 SEPTEMBER SEPTEMBER

 3.39.....1939 0.00.....2000 (MOST RECENT) 

 2.06.....1997 TRACE....2001 (MOST RECENT) 

 1.58.....1963 

 1.29.....1998 

 1.17.....1975 

 1.09.....1976 

 1.03.....1967 

 0.98.....1951 

 0.88.....1940 

 0.87.....1952 

 0.63.....1972 

 OCTOBER OCTOBER

 1.22.....1992 0.00.....2003 (MOST RECENT) 

 1.13.....1941 TRACE....1999 (MOST RECENT) 

 1.13.....1947 

 1.12.....1972 

 0.92.....2000 

 0.70.....1976 

 0.66.....1946 

 0.63.....1958 

 0.62.....1978 

 0.61.....1974/1963 

 

 

 NOVEMBER NOVEMBER 

 2.22.....1965 0.00.....1999 (MOST RECENT) 

 1.88.....1960 TRACE....2000 (MOST RECENT) 

 1.80.....1987 

 1.71.....2004 

 1.52.....1967 

 1.09.....1959 

 1.09.....1972 

 1.04.....1946 

 0.96.....1958 

 0.94.....1984 

 

 DECEMBER DECEMBER

 2.10.....2004 0.00......1981 (MOST RECENT) 

 1.78.....1940 TRACE.....1999 (MOST RECENT) 

 1.71.....1992 

 1.68.....1984 

 1.38.....1959 

 1.34.....1943 

 1.15.....1978 

 1.06.....1977 

 1.00.....1965 

 0.96.....2003/1947 
21

MEASURABLE PRECIPITATION DAYS AND EXTREMES 

 NORMAL (.01 DAYS) MOST EVER (.01 DAYS) 

 (1971-2000) (1937-2004) 

 JAN......3.4 13.....1995 

 FEB......3.3 12.....1998 

 MAR......3.6 12.....1973 

 APR......1.8 8.....1965 

 MAY......1.6 4.....1995 (MOST RECENT) 

 JUN......0.7 3.....1972/1967/1949 

 JUL......2.6 8.....1984/1976 

 AUG......3.0 9.....1983 

 SEP......1.7 8.....1967/1939 

 OCT......1.8 8.....1946 

 NOV......1.8 6.....1978/1965/1946 

 DEC......3.1 9.....1992/1984 

 YEARLY 

 AVG.....28.5 

 NORMAL (.10 DAYS) MOST EVER (.10 DAYS)

 (1971-2000) (1937-2004) 

 JAN.....1.8 7.....1979/1949 

 FEB.....1.7 8.....1998 

 MAR.....1.5 9.....1992 

 APR.....0.5 6.....1965 

 MAY.....0.6 3.....1977 

 JUN.....0.3 2.....1990 (MOST RECENT) 

 JUL.....1.0 5.....1950 

 AUG.....1.1 4.....1983/1972 

 SEP.....0.7 5.....1939 

 OCT.....0.7 4.....2000/1974 

 NOV.....0.7 3.....2004 (MOST RECENT) 

 DEC.....1.3 6.....1943 

 YEARLY 

 AVG....11.9 
22

CONSECUTIVE WET AND DRY DAYS

CONSECUTIVE WET DAYS (0.01 INCH OR GREATER)@

6.....2/24/2003 

6.....4/06/1943 

5.....1/12/1993 

5.....8/06/1983 

5.....1/04/1974 

5.....1/09/1949 

5.....2/27/1938 

CONSECUTIVE DAYS WITH A TRACE OR BETTER @

9.....2/05/1978 

9.....7/23/1952 

9.....2/14/1941 

7.....8/18/1999 

7.....9/03/1998 

7.....1/12/1993 

7.....4/06/1965 

7.....7/30/1947 

@Dates are first day of occurrence 

CONSECUTIVE DRY DAYS* 

 101.....7/02/1944-10/10/1944 AND 9/02/1995-12/11/1995 

 100.....3/25/2002-7/02/2002 

 84.....5/02/1978-7/24/1978 

CONSECUTIVE DAYS WITHOUT MEASURABLE PRECIPITATION** 

150.....2/22/1959-7/21/1959 

146.....3/09/2000-8/01/2000 

 145.....5/31/1944-10/22/1944 

143.....2/12/1950-7/04/1950 

140.....9/22/1999-2/09/2000 

*Dry days are defined as having less than a trace (T) of precipitation. 

**Measurable precipitation is defined as a hundredth (0.01) or greater. 
23

PRECIPITATION RECORDS 

(MAXIMUM MONTHLY 24 HOUR PRECIPITATION) 

JANUARY 1.09.....1990 

FEBRUARY 1.30.....1993 

MARCH 1.27.....1992 

APRIL 0.97.....1965 

MAY 0.83.....1983 

JUNE 0.97.....1990 

JULY 1.36.....1984 

AUGUST 2.59.....1957 

SEPTEMBER 1.12.....1939 

OCTOBER 1.09.....1992 

NOVEMBER 1.78.....1960 

DECEMBER 2.10.....2004 

MOST PRECIPITATION IN 24 HOURS 

2.59.......8/20-21/1957 

2.10......12/28-29/2004 

1.78......11/05-06/1960 

1.75.......8/09-10/1942 

1.56..........8/12/1979 

1.36..........7/28/1984 

1.34.......8/16-17/1977 

1.32.......8/03-04/1955 

1.32..........7/24/1956 

1.30.......2/07-08/1993 
24

10 COLDEST AND HOTTEST YEARS AND OVERALL MONTHS

 

 10 COLDEST YEARS 10 HOTTEST YEARS 

 

 64.1.....1941 70.0.....2003 

 64.2.....1949 69.7.....2000 

 64.3.....1937 69.6.....2001 

 64.3.....1938 69.4.....2004 

 64.6.....1948 69.4.....1996 

 64.8.....1955 69.2.....1981 

 64.8.....1964 69.0.....1994 

 64.8.....1971 69.0.....1995 

 65.0.....1951 68.9.....2002 

 65.1.....1939/65/82 68.7.....1989 

 10 HOTTEST YEARS 10 HOTTEST YEARS 

FOR MAXIMUM TEMPERATURE FOR MINIMUM TEMPERATURE 

 83.0.....1940 59.4.....2003 

 83.0.....1947 59.0.....2004 

 82.8.....1943 58.6.....2000 

 82.3.....1942 58.6.....2001 

 82.3.....1977 57.5.....1996 

 82.0.....1989 57.5.....1997 

 81.9.....1950 57.4.....2002 

 81.9.....1981 57.3.....1994 

 81.7.....1937 57.2.....1995 

 81.7.....1946 57.0.....1999 

 10 COLDEST YEARS 10 COLDEST YEARS 

FOR MAXIMUM TEMPERATURE FOR MINIMUM TEMPERATURE 

 77.0.....1982 47.2.....1937 

 77.5.....1983 47.8.....1938 

 77.6.....1998 48.3.....1948 

 77.8.....1965 48.9.....1939 

 78.0.....1971 49.6.....1941 

 78.3.....1964 49.7.....1942 

 78.4.....1984 50.2.....1949 

 78.5.....1949 50.3.....1944 

 78.6.....1975 50.4.....1945 

 78.6.....1957/1955 50.4.....1940 

10 COLDEST OVERALL MONTHS 10 HOTTEST OVERALL MONTHS 

 31.2.....JAN 1937 94.8.....JUL 2003 

 32.4.....JAN 1949 94.5.....JUL 2002 

 40.2.....DEC 1990 93.4.....JUL 1959 

 40.8.....DEC 1968 93.4.....JUL 1989 

 40.9.....JAN 1973 93.2.....JUL 1997 

 41.0.....JAN 1960 93.1.....JUL 1972 

 41.0.....JAN 1974 93.0.....JUL 2004 

 41.1.....JAN 1955 92.9.....AUG 1994 

 41.1.....JAN 1963 92.8.....JUL 1971 

 41.1.....JAN 1979* 92.7.....JUL 1981 

* and previous years 
25

10 COLDEST AND HOTTEST MONTHS BY MONTH

 COLDEST HOTTEST

 JANUARY JANUARY

 

 31.2.....1937 54.2.....2003 

 32.4.....1949 51.7.....1986 

 40.9.....1973 51.4.....2005 

 41.0.....1960 51.4.....2000 

 41.0.....1974 51.1.....1981 

 41.1.....1955 50.5.....1999 

 41.1.....1979 50.4.....1953 

 41.1.....1963 49.5.....1980 

 41.2.....1950 49.3.....1994 

 41.8.....1952 48.8.....1956 

 FEBRUARY FEBRUARY

 

 41.2.....1939 58.6.....1995 

 41.8.....1949 55.9.....1991 

 43.7.....1955 55.8.....1963 

 44.8.....1937 55.8.....1986 

 45.6.....1956 55.7.....1968 

 45.6.....1964 55.0.....1957 

 45.8.....1966 54.8.....1996 

 46.0.....1960 54.2.....1977 

 46.3.....1942 54.1.....1954 

 46.3.....1969 54.1.....1992 

 MARCH MARCH 

 

 50.4.....1948 66.5.....2004 

 50.4.....1952 63.7.....1972 

 50.7.....1973 63.4.....1989 

 51.3.....1962 63.0.....1986 

 52.1.....1948 62.7.....1994 

 52.2.....1954 62.6.....1997 

 52.3.....1964 60.8.....1993 

 52.6.....1977 60.5.....1990 

 52.7.....1991 60.5.....1999 

 53.0.....1969 60.5.....2001 

 

 APRIL APRIL

 

 56.2.....1967 72.7.....1989 

 56.6.....1975 71.2.....2000 

 58.5.....1963 70.6.....1981 

 58.5.....1983 70.5.....1992 

 58.6.....1970 70.3.....1962 

 59.2.....1941 69.7.....2002 

 60.3.....1955 69.6.....1954 

 60.9.....1999 69.1.....1946 

 61.1.....1998 68.8.....1990 

 61.2.....1965 68.7.....1959 
26

10 COLDEST AND HOTTEST MONTHS BY MONTH (CONT)

 MAY MAY 

 66.2.....1953 82.2.....2001 

 67.7.....1977 81.6.....1997 

 68.0.....1971 80.8.....2000 

 69.0.....1980 80.7.....1984 

 69.3.....1957 79.1.....2004 

 69.6.....1965 78.8.....1947 

 69.9.....1991 78.0.....1940 

 70.0.....1998 78.0.....1958 

 70.2.....1938 77.9.....2003 

 70.2.....1955 77.8.....1976 

 

 

 JUNE JUNE

 77.6.....1944 90.3.....1994 

 78.0.....1965 89.1.....1974 

 78.6.....1963 88.8.....1981 

 78.8.....1941 88.7.....2000 

 79.6.....1967 88.1.....2002 

 80.0.....1998 88.1.....2004 

 80.2.....1943 88.0.....1977 

 80.3.....1952 87.9.....2001 

 80.8.....1945 87.9.....2003 

 80.9.....1995 87.8.....1986 

 JULY JULY

 

 86.9.....1976 94.8.....2003 

 86.9.....1987 94.5.....2002 

 87.0.....1938 93.4.....1959 

 87.1.....1944 93.4.....1989 

 87.2.....1941 93.3.....1994 

 87.2.....1955 93.2.....1996 

 87.6.....1986 93.1.....1972 

 87.8.....1937 93.0.....2004 

 88.1.....1982 92.8.....1971 

 88.2.....1999 92.7.....1981 

 AUGUST AUGUST

 

 83.0.....1941 93.1.....1995 

 83.5.....1968 92.9.....1994 

 83.8.....1983 92.2.....1969 

 85.0.....1949 92.0.....1998 

 85.4.....1984 91.9.....1996 

 85.5.....1951 91.9.....2001 

 85.5.....1976 91.2.....1986 

 85.9.....1979 90.8.....1952 

 86.0.....1938 90.7.....1997 

 86.0.....1954 90.6.....2002 
27

10 COLDEST AND HOTTEST MONTHS BY MONTH (CONT)

 

 SEPTEMBER SEPTEMBER

 73.0.....1941 85.3.....1979 

 74.8.....1965 85.1.....2001 

 75.4.....1985 84.4.....2003 

 75.4.....1986 83.7.....1992 

 75.6.....1939 83.7.....1995 

 75.6.....1961 83.4.....1956 

 76.3.....1940 83.4.....1974 

 77.2.....1970 83.3.....1947 

 77.4.....1942 83.1.....1994 

 77.6.....1971 82.8.....2002 

 

 

 OCTOBER OCTOBER

 60.7.....1941 75.4.....2003 

 61.6.....1946 74.9.....1988 

 61.7.....1971 73.5.....1978 

 62.8.....1969 72.2.....1991 

 63.0.....1982 72.1.....2001 

 63.0.....1984 72.0.....1964 

 63.3.....1949 71.9.....1952 

 63.4.....1938 71.8.....1950 

 63.5.....1972 71.6.....1999 

 63.7.....1957 71.4.....1977 

 

 NOVEMBER NOVEMBER

 

 46.0.....1938 58.9.....1995 

 49.0.....1957 58.9.....1949 

 49.4.....1994 58.8.....1999 

 49.5.....1952 58.1.....2001 

 49.6.....1948 58.0.....1976 

 49.7.....1972 58.0.....1981 

 50.0.....1964 57.3.....1962 

 50.1.....1940 57.3.....1989 

 50.2.....2000 57.2.....1954 

 50.3.....1961 57.2.....1977 

 

 DECEMBER DECEMBER

 40.2.....1990 52.7.....1980 

 40.8.....1968 51.9.....1977 

 41.1.....1948 51.2.....1950 

 41.3.....1972 49.5.....2000 

 41.4.....1971 49.2.....2004 

 41.6.....1967 48.9.....1995 

 42.3.....1951 48.8.....1958 

 42.5.....1961 48.8.....1981 

 42.5.....1987 48.7.....1999 

 42.9.....1978 48.6.....1946 
28

DESERT HEAT STATISTICS

 90 DEGREE DAYS (AVG PER MONTH) MOST EVER LEAST EVER 

 1971-2000 1937-2004 1937-2004 

 MAR......0.0 3...2004

 APR......3.5 14...1946 0...MANY TIMES 

 MAY.....15.0 27...2001 3...1953 

 JUN.....26.3 30...MANY TIMES 19...1998/1963 

 JUL.....30.3 31...MANY TIMES 28...1984 

 AUG.....29.8 31...MANY TIMES 24...1983 

 SEP.....22.2 30...1979/1947 11...1986 

 OCT......6.0 19...1991 0...MANY TIMES 

 AVG 90 DEGREE DAYS PER YEAR....133.1 

 

 NORMAL 90 DEGREE DAYS EXTEND FROM

......MAY 22ND TO SEP 27TH........

 90 DEGREE DAYS IN A YEAR (1937-2004) 

 MOST LEAST 

158.....1940/1937 102.....1998 

157.....1958/1943 110.....1982 

 111.....1983 

 117.....1941 

 100 DEGREE DAYS 

 (AVG PER MONTH) MOST EVER LEAST EVER 

 1971-2000 1937-2004 1937-2004 

 MAY......2.2 14...1947 0...MANY TIMES 

 JUN.....15.8 25...1974 1...1965 

 JUL.....25.0 31...1988 (MOST RECENT) 15...1999 

 AUG.....21.8 31...1985 (MOST RECENT) 14...1984 (MOST RECENT) 

 SEP......7.5 22...1943 0...1972 (MOST RECENT) 

 OCT......0.1 2...1980 0...MANY TIMES 

 AVG 100 DEGREE DAYS PER YEAR.....72.4 

 NORMAL 100 DEGREE DAYS EXTEND FROM

.......JUN 17TH TO AUG 28TH........

 

 

 100 DEGREE DAYS IN A YEAR (1937-2004) 

 MOST LEAST 

 100.....1947 44.....1965 

 95.....1948/1946 55.....1992/1941 

 

 
29

DESERT HEAT STATISTICS (CONT) 

 105 DEGREE DAYS MOST EVER LEAST EVER 

 (AVG PER MONTH) 1937-2004 1937-2004 

 1971-2000 

 MAY.....0.4 MAY....4/1947 MAY....0 (NMRS TIMES) 

 JUN.....7.6 JUN...17/1985/1940 JUN....0/1969/1965 

 JUL....15.8 JUL...28/1942 JUL....5/1955 

 AUG....10.5 AUG...23/1969 AUG....1/1968 

 SEP.....1.9 SEP...11/1948/1945 SEP....0 (NMRS TIMES) 

 AVG 105 DEGREE DAYS PER YEAR....36.2 

 MAXIMUM.....61 IN 1940 

 110 DEGREE DAYS MOST EVER LEAST EVER

 (AVG PER MONTH) 1937-2004 1937-2004

 1971-2000

 JUN.....1.8 JUN...10/1961/1940 SEVERAL YEARS 

 JUL.....5.1 JUL...17/1942 NEVER REACHED 

 AUG.....1.9 AUG...10/1937 

 SEP.....0.* SEP....3/1947 

 AVG 110 DEGREE DAYS YEAR.....8.8 * OCCURRED ONCE IN 30 YEARS MAXIMUM.....29 IN 1940 

 115 DEGREE DAYS MOST EVER AVG HOTTEST HIGH FOR THE SUMMER 

 (AVG PER MONTH) 1937-2004 (JUN-SEP) (1937-2004) 

 1971-2000 

 JUN.....0.1 JUN....3/1994/1940 .....113.....

 JUL.....0.4 JUL....3/1942 

 AUG.....0.1 AUG....3/1979 

 AVG 115 DEGREE DAYS PER YEAR.....0.6 

 MAXIMUM......5 IN 1940 

 HIGHEST AVERAGE 

 AVG HOTTEST HIGH (BY MONTH) DAILY TEMPERATURE 

 (1937-2004) (1937-2004) 

 JAN.....68 JUL....113 102....7/11/2003 

 FEB.....75 AUG....110 102....7/13/2003 

 MAR.....83 SEP....105 102....6/30/1994 

 APR.....92 OCT.....94 102....7/08/1989 

 MAY....101 NOV.....79 101....7/22/2003* 

 JUN....110 DEC.....68 

*occurred other years 
30

 DESERT HEAT STATISTICS (CONT) 

CONSECUTIVE DAYS 90 DEGREES OR HOTTER 

118.....5/07-9/01/1940 

114.....5/29-9/19/1956

109.....5/26-9/11/1994

CONSECUTIVE DAYS 100 DEGREES OR HOTTER 

66......6/27-8/31/1944 

46......6/20-8/04/1988 

45......7/01-8/14/1971 

CONSECUTIVE DAYS 105 DEGREES OR HOTTER 

21......7/18-8/07/2000 

21......7/25-8/14/1977 

21......6/22-7/12/1973 

CONSECUTIVE DAYS 110 DEGREES OR HOTTER 

10.....6/17-6/26/1961 

9......7/15-7/23/1978 

9......7/09-7/17/1961

CONSECUTIVE DAYS 115 DEGREES OR HOTTER 

3......6/28-6/30/1994 

3......6/30-7/02/1950 

3......7/22-7/24/1942 

 EARLIEST DAY WITH READING LATEST DATE OF LAST... 

 80 OR HIGHER.....2/01/2003 80 OR HIGHER.....11/24/1949 

 90 OR HIGHER.....3/20/2004 90 OR HIGHER.....10/29/1950/1937 

 100 OR HIGHER.....5/01/1947 100 OR HIGHER.....10/04/1947 

 110 OR HIGHER.....6/08/1955 110 OR HIGHER.....(SEVERAL YEARS 

 115 OR HIGHER.....6/14/1940 115 OR HIGHER.....NEVER OCCURRED) 

 LATEST DATE OF FIRST EARLIEST IN SEASON TO END WITH 

 

 80 OR HIGHER.....4/23/1941 80 OR HIGHER.....10/10/1957 

 90 OR HIGHER.....5/21/1993 90 OR HIGHER.....9/13/1986 

 100 OR HIGHER.....6/30/1965 100 OR HIGHER.....8/28/1961 

 110 OR HIGHER.....(SEVERAL YEARS 110 OR HIGHER.....(SEVERAL YEARS 

 115 OR HIGHER.....NEVER REACHED) 115 OR HIGHER.....NEVER REACHED) 

AVERAGE DATE OF FIRST

 

 80.....MARCH 17 

 90.....APRIL 20 

 100.....MAY 25 

 105.....JUNE 9 

 110.....JULY 1 

 115.....JULY 11 
31

FROST/FREEZE DATA

 CONSECUTIVE DAYS WITH LOWS 32 OR LESS HIGHS LESS THAN OR EQUAL TO 32

 32.....1/03-2/03/1947 JAN.......5/1937 

 25.....12/28/1948-1/21/1949 FEB-NOV...NEVER OCCURED 

 22.....12/07-28/1937 DEC.......1/1972 

 22.....1/07-28/1947 

 

 AVERAGE LOWS LESS THAN OR EQUAL TO MOST LOWS AT OR BELOW FREEZING 

 32...BY MONTH (1971-2000) (1937-2004) 

 JAN......9.1 JAN......30 IN 1949/1947 

 FEB......3.2 FEB......23 IN 1939 

 MAR......0.6 MAR......12 IN 1948 

 APR......0.* (ONCE IN 30 YEARS) APR.......2 IN 1945 

 MAY-SEP..NEVER OCCURED MAY-SEP...NEVER OCCURRED 

 OCT......0.1 OCT.......3 IN 1971 

 NOV......2.0 NOV......21 IN 1938 

 DEC......9.0 DEC......25 IN 1948 

 AVERAGE...24.0

 EARLIEST DATE WITH READING OF LATEST DATE IN SPRING WITH 

 (1937-2004) (1937-2004) 

 32 OR LESS.....10/21/1949 32 OR LESS.....4/12/1967 

 28 OR LESS.....10/30/1971 28 OR LESS.....3/31/1938 

 24 OR LESS.....11/07/1938 24 OR LESS.....3/06/1939 

 AVG DATE OF FIRST FREEZE (1971-2000) AVG DATE OF LAST FREEZE (1971-2000)

 ............11/21................... .............3/7................. 

 

 SHORTEST FREEZE FREE PERIOD....202 DAYS (4/6/45-10/24/45) 

 AVERAGE FREEZE FREE PERIOD.....269 DAYS 

 LONGEST FREEZE FREE PERIOD.....367 DAYS (12/17/94-12/18/95)

 LATEST DATE IN FALL/WINTER EARLIEST IN WINTER/SPRING 

 OF FIRST READING SEASON FOR LAST READING 

 32 OR LESS.....12/19/1995 and 2002 32 OR LESS....12/16/94 

 28 OR LESS.....NONE NUMEROUS YEARS 28 OR LESS.....NONE NUMEROUS YEARS 

 24 OR LESS.....NONE NUMEROUS YEARS 24 OR LESS.....NONE NUMEROUS YEARS 

 

 

 AVG COLDEST LOW (BY MONTH) AVG COLDEST LOW FOR THE WINTER 

 (1971-2000) (NOV-FEB) (1971-2000) 

 JAN.....25 .....22..... 

 FEB.....29 

 MAR.....35 

 APR.....41 

 MAY.....49 

 JUN.....58 JUL.....67 

 AUG.....67 

 SEP.....57 

 OCT.....43 

 NOV.....31 

 DEC.....25 
32

THUNDERSTORM DAYS

 AVERAGE PER MONTH MOST EVER BY MONTH

 (1971-2000) (1949-2004)

 JAN.....0.0 JAN.....0 

 FEB.....0.2 FEB.....2...2000 

 MAR.....0.4 MAR.....4...1992 

 APR.....0.5 APR.....3...1952 

 MAY.....1.0 MAY.....4...1992/1965 

 JUN.....1.0 JUN.....6...1972 

 JUL.....3.8 JUL.....9...1952 

 AUG.....3.7 AUG....12...1955 

 SEP.....1.5 SEP.....6...1967 

 OCT.....0.5 OCT.....4...1974 

 NOV.....0.2 NOV.....2...1959 

 DEC.....0.0* DEC.....1...2003/1966 

 * OCCURRED TWICE IN 50 YEARS 

 ANNUAL AVG.....12.8

 MOST THUNDERSTORM DAYS IN A MONSOON SEASON 

JUNE-SEPTEMBER (1949-2004) 

 22.....1955 20.....1984/1967/1961 

 19.....1998 

 17.....1972 
33

HAIL DAYS 

 

 

 AVG PER MONTH MOST EVER BY MONTH (1971-2000) (1951-2004) 

 JAN.....0.0 JAN.....0 

 FEB.....0.0 FEB.....1...1970 

 MAR.....0.1 MAR.....2...1992 

 APR.....0.0 APR.....0 

 MAY.....0.1 MAY.....1...1979/1975/1973 

 JUN.....0.0 JUN.....1...1970/1969/1967/1955 

 JUL.....0.0 JUL.....1...1960 

 AUG.....0.1 AUG.....1...2004/1989 

 SEP.....0.1 SEP.....1...1983/1972 

 OCT.....0.0 OCT.....0 

 NOV.....0.0 NOV.....0 

 DEC.....0.0 DEC.....0 

 ANNUAL AVG.....0.4

MOST HAIL DAYS IN MONSOON SEASON 

JUNE-SEPTEMBER (1951-2004)

1.....SEVERAL OCCASIONS 
34

WIND NORMALS...MEANS AND EXTREMES* 

MEAN 

JAN........WSW 7.3 

FEB........WSW 8.5 

MAR.........SW 10.1 

APR.........SW 11.0 

MAY.........SW 11.2 

JUN..........S 11.2 

JUL..........S 10.2 

AUG..........S 9.7 

SEP.........SW 8.9 

OCT.........SW 8.0 

NOV.........SW 7.6 

DEC........WSW 7.0 

 ANN.........SW 9.2 

ALL TIME WINDIEST MONTHS 

 (1949-2004)

JAN....11.2...1982 

FEB....11.3...1986 

MAR....13.8...1984 

APR....14.4...1957 

MAY....13.7...1955 

JUN....14.5...1958 

JUL....13.3...1963 

AUG....13.6...1954 

SEP....12.3...1986 

OCT....10.5...1975 

NOV....10.8...1983 

DEC....10.1...1988 

PEAK GUSTS BY MONTH IN MPH 

JAN.......WSW 58......1/24/1965 

FEB........NW 73......2/19/1976 

MAR........NW 82......3/21/1984 

APR.........W 69......4/30/1988 

MAY........NW 73......5/30/1991 

JUN.......NNW 67......6/07/1964 

JUL.........S 75......7/14/1991 

AUG........SE 90......8/08/1989 

SEP........SE 73......9/04/1973 

OCT........SW 71......10/23/1956 

NOV.........S 70......11/20/1983 

DEC.........W 68......12/05/1951 

* PREVAILING WIND DIRECTION TO NEAREST CARDINAL COMPASS POINT. 

 WIND NORMAL...MEANS AND EXTREMES ARE IN MILES PER HOUR. 
35

10 WINDIEST MONTHS BY MONTH (MPH) 

 JAN FEB

 11.2.....1982 11.3.....1986 

 9.5.....1980 11.0.....1955 

 9.3.....1957 10.9.....1956 

 9.2.....1989 10.7.....1989 

 8.9.....1975/1973/1962 10.3.....1990/1960 

 8.8.....1987 10.2.....1984/1962 

 8.3.....1997/1990/1965 9.9.....1977/1964 

 MAR APR

 13.8.....1984 14.4.....1957 

 13.5.....1977 13.9.....1963 

 13.1.....1985 13.8.....1955 

 13.0.....1989/1975 13.4.....1983 

 12.3.....1954 13.3.....1986 

 12.0.....1982 12.8.....1972 

 11.9.....1957 12.7.....1984/1973 

 11.5.....1983 12.6.....1964 

 11.3.....1986/1976 12.3.....1956 

 MAY JUN

 13.7.....1955 14.5.....1958 

 13.6.....1956 13.6.....1980 

 13.4.....1990/1989 13.4.....1963 

 13.1.....1985 13.3.....1978/1954 

 12.9.....1998 12.8.....1989 

 12.7.....1962 12.7.....1990/1976 

 12.6.....1957 12.6.....1956 

 12.5.....1963/1961/1959 12.4.....1997/1981 

 JUL AUG

 13.3.....1963 13.6.....1954 

 12.8.....1983/1958 12.1.....1957 

 12.6.....1981 12.0.....1962 

 12.5.....1955 11.8.....1976 

 12.3.....1972 11.7.....1989/1956 

 12.2.....1989 11.4.....1985 

 12.1.....1957 11.3.....1995/1960 

 11.8.....1988 10.7.....1963 

 11.7.....1977 10.5.....1990 MOST RECENTLY 
36

10 WINDIEST MONTHS BY MONTH (CONT) 

 SEP OCT 

 12.3.....1986 10.5.....1975 

 12.0.....1954 10.4.....1956 

 11.1.....1989 10.2.....1981/1973 

 11.0.....1985/1955 10.0.....1984/1961 

 10.7.....1977 9.9.....1989 

 10.3.....1956 9.7.....1962 

 10.2.....1964 9.3.....1979 

 10.0.....1963 9.1.....1985 

 9.8.....1981 

 NOV DEC

 10.8.....1983 10.1.....1988 

 10.4.....1973 9.5.....1982 

 10.1.....1994/1988 9.1.....1972 

 10.0.....1985 8.8.....1987 

 9.9.....1975 8.6.....1975/1967/1959 

 9.3.....1964 8.5.....1997/1971 

 9.0.....1982/1981/1980/1961 8.4.....1998 
37

HEATING/COOLING DEGREE DAYS 

 NORMALS (1971-2000)

HDD/CDD 

 JAN.....574/0 

 FEB.....375/0 

 MAR.....244/20 

 APR......83/98 

 MAY......16/323 

 JUN.......0/602 

 JUL.......0/796 

 AUG.......0/739 

 SEP.......0/474 

 OCT......57/157 

 NOV.....318/4 

 DEC.....571/0 

 

 ANNUAL HDD...2238 

 CDD...3213 

 

 

 

 MOST/LEAST CDD (1937-2004) MOST/LEAST HDD EVER (1937-2004)

 JAN......NEVER OCCURRED JAN.....1040...1937 

 331...2003 

 FEB.......20...1986 FEB......658...1939 

 0...NUMEROUS YEARS 170...1995 

 MAR......124...2004 MAR......447...1952 

 0...SEVERAL YEARS 71...2004 

 APR......259...1989 APR......261...1967 

 2...1975 7...1992 

 MAY......541...2001 MAY.......72...1964 

 108...1953 0...MANY TIMES 

 JUN......768...1994 JUN........8...1993 

 387...1944 0...MANY TIMES 

 JUL......930...2003 JUL............NEVER OCCURED 

 685...1987 

 AUG......880...1995 AUG............NEVER OCCURED 

 566...1941 

 SEP......614...1979 SEP.......15...1965 

 252...1941 0...MANY TIMES 

 OCT......335...2003 OCT......207...1971 

 16...1946 0...2001/1988/1944 

 NOV.......31...1988 NOV......563...1938 

 0...NUMEROUS YEARS 151...1995 

 DEC......NEVER OCCURRED DEC......761...1990 

 374...1980
38

SNOW (1937-1996)***

 NORMALS (1971-1996) MOST EVER BY MONTH (1937-1996) 

 

 JAN.....0.9 16.7.....JAN/1949 

 FEB.....0.1 4.1.....FEB/1939 

 MAR.....0.* 0.1.....MAR/1976 

 APR-SEP.....NEVER OCCURRED 

 OCT.....0.0 TRACE...OCT/1956 

 NOV.....0.0 4.0.....NOV/1964 

 DEC.....0.* 2.0.....DEC/1967 

 * LESS THAN 0.1 

 ANNUAL AVERAGE.....1.0 

 6 SNOWIEST MONTHS MOST SNOW IN 24 HOURS 

 16.7.....1/1949 9.0.....1/4-5/1974 

 13.4.....1/1974 7.5.....1/30-31/1979 

 9.9.....1/1979 5.0.....1/11-12/1949 

 4.1.....2/1939 4.4.....1/1/1974 

 4.0.....11/1964 4.1.....2/3-4/1939 

 2.0.....12/1967 4.0.....11/15-16/1964 

 GREATEST SNOW DEPTHS (INCHES) MOST SNOW IN A SEASON 

 8.....1/5/1974 16.7....1948/49 

 7.....1/12/1949 13.4....1973/74 

 6.....1/31/1979 10.2....1978/79 

 4.1....1938/39 BIGGEST SNOW STORMS 4.0....1964/65

 9.7.....1/10-12/1949 

 9.0.....1/4-5/1974 CONSECUTIVE SNOW DAYS

 7.8.....1/30-2/2/1979 (TRACE OR MORE) 

 4.7.....1/25/1949 5......1/9-13/1949 

 4.4.....1/1/1974 5......1/4-8/1974 

 4.1.....2/3-4/1939 

 4.0.....11/15-16/1964 

 2.4.....1/28/1979 CONSECUTIVE SNOW DAYS 

 2.3.....1/19-20/1949 (MEASURABLE) 

 2.0.....12/15/1967 3......1/11-13/1949 

 1.5.....1/12/1937 AND 1/7/1955 3......1/30-2/1/1979 

 1.4.....2/19/1990 

 1.0.....1/20/1945...1/29/1957 

 

 EARLIEST SNOW EVER (Trace or Measurable) 

 11/15/1964.....3.0" (1" more on the 16th) 

 LATEST SNOW EVER

 Trace..........4/4/58 

 Measurable.....3/3/76.....0.1" 

***Starting in 1996...snowfall and snow depth measurements were no longer officially 

recorded at McCarran International Airport. 

NWS Forecast Office-LAS VEGAS SNOWFALL (1997-2004) 

 1.3...12/30/2003 

 1.0...12/06/1998 
39

NORMAL SUNSHINE

(1971-1994) 

(PERCENT OF POSSIBLE) 

JAN.....77 

FEB.....81 

MAR.....83 

APR.....87 

MAY.....88 

JUN.....93 

JUL.....88 

AUG.....88 

SEP.....91 

OCT.....87 

NOV.....81 

DEC.....78 

ANNUAL AVG.....85 
40

SUNSHINE (CONT)

SUNNIEST MONTHS ALL TIME 

(PERCENT OF POSSIBLE, 1951-1994) 

 

 JAN FEB 

 

95.....1984/1976 94.....1984 

92.....1972 93.....1964/1954 

91.....1971 92.....1974/1972/1956 

 MAR APR 

97.....1972 97.....1974 

96.....1988/1953 96.....1981/1969 

95.....1956/1990 94.....1989/1966 

 

 MAY JUN

98.....1984 98.....1974 MOST RECENTLY 

95.....1976/1970/1952 

 JUL AUG 

 99.....1993 98.....1976/1985 

96.....1995/1983/1963 97.....1980/1956/1952 

95.....1972/1971/1958 95.....1978/1966 

 SEP OCT 

100.....1970 96.....1976/1967 

99......1955 95.....1980/1973 

 98......1993 93.....1991/1989/1964/1954 

 NOV DEC 

 98.....1956 96.....1976 

 96.....1988 94.....1963 

 95.....1976 94.....1988 

 

 ALL TIME SUNNIEST YEARS 

 (IN PERCENTAGE OF POSSIBLE) 

 93.....1976 

 92.....1989 

 91.....1956 
41

CLOUDIEST MONTHS AND YEARS (IN PERCENTAGE OF POSSIBLE SUNSHINE, 1951-1994)

 JAN FEB

53.....1979 61.....1983 

54.....1978 62.....1973 

 MAR APR 

64.....1958 73.....1965 

70.....1973/1975 76.....1952 

73.....1952 76.....1957 

 MAY JUN

72.....1977 80.....1977 

77.....1994/1957 84.....1965 

 77.....1951 86.....1972 

 JUL AUG 

75.....1984 74.....1955 

76.....1954 76.....1982 

78.....1970 78.....1971 

 SEP OCT 

75.....1963 55.....1972 

78.....1967 70.....1987 

79.....1989 71.....1951 

 

 NOV DEC 

69.....1982 61.....1983 

70.....1972 63.....1971 

71.....1964 64.....1977 

ALL TIME CLOUDIEST YEARS 

(IN PERCENTAGE OF POSSIBLE SUNSHINE) 

(1951-1994) 

78.....1957 

80.....1986 

81.....1965 
42

RELATIVE HUMIDITY

AVERAGE RELATIVE HUMIDITY (IN PERCENTAGE) 

 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR 

LOCAL TIME 

HOUR 04 57 52 47 35 33 24 28 33 34 38 45 52 40 

HOUR 10 43 38 32 23 20 15 20 23 23 26 32 38 28 

HOUR 16 33 28 24 17 15 11 15 18 18 20 26 31 21 

HOUR 22 51 45 39 27 24 17 21 25 26 30 39 46 32 
43

FOG 

NORMALS (VISIBILITIES 1/4 MILES OR LESS) 

(1971-2000) 

 JAN..........0.3 

 FEB..........0.1 

 MAR..........0.1 

 APR..........0.0 

 MAY..........0.0 

 JUN..........0.0 

 JUL..........0.0 

 AUG..........0.0 

 SEP..........0.* 

 OCT..........0.0 

 NOV..........0.1 

 DEC..........0.1 

 ANNUAL AVG...0.7 

 * OCCURRED ONCE IN 30 YEARS

NORMAL FOG DAYS (<= 5/8 MILE) FOGGIEST MONTHS (<= 5/8 MILE) 

 (1971-2000) (1971-2004) 

 JAN.....1.2 JAN.....5 IN 1980 

 FEB.....0.8 FEB.....5 IN 1980 

 MAR.....0.4 MAR.....3 IN 1992/1981 

 APR.....0.1 APR.....2 IN 1988 

 MAY.....0.* MAY.....1 IN 1987/1977 

 JUN.....0.0 JUN.....0 

 JUL.....0.* JUL.....1 IN 1984 

 AUG.....0.1 AUG.....1 IN 1983/1979 

 SEP.....0.* SEP.....1 IN 1983 

 OCT.....0.1 OCT.....1 IN 1992/1987/1978 

 NOV.....0.3 NOV.....3 IN 1987 

 DEC.....0.7 DEC.....5 IN 1984 

 ANNUAL AVG.....3.7 

 *OCCURRED ONCE IN 30 YEARS 
44

PRESSURE

ALL TIME HIGHEST (BY MONTH) ALL TIME LOWEST (BY MONTH) 

 (1937-2004) (1937-2004) 

JAN.....30.76...1979 JAN.....29.37...1944 

FEB.....30.77...2002 FEB.....29.31...1987 

MAR.....30.61...1971 MAR.....29.25...1984 

APR.....30.39...1971/1963 APR.....29.24...1954 

MAY.....30.55...1966 MAY.....29.28...1975 

JUN.....30.24...1981 JUN.....29.18...1947 

JUL.....30.18...1988 JUL.....29.40...1999 

AUG.....30.18...1981 AUG.....29.44...1984 

SEP.....30.29...1970 SEP.....29.31...2000 

OCT.....30.55...1981 OCT.....29.35...1994 

NOV.....30.72...1969 NOV.....29.18...1982 

DEC.....30.80...1967 DEC.....29.17...1949 

 ALL TIME HIGHEST.....30.80...12/1967 

 ALL TIME LOWEST......29.17...12/1949 
45

HOLIDAY WEATHER

(1937-2004) 

 NEW YEAR HOLIDAY (JANUARY 1ST) 

 AVERAGE HIGH/LOW.....56/35 

 RECORD HIGH.....69 IN 1981 

 RECORD LOW......21 IN 1954 

 MOST SNOW EVER.......4.4 INCHES IN 1974 

 MOST PRECIPITATION...0.43 IN 1974 

 DAYS OF MEASURABLE PRECIPITATION.....1 

 DAYS WITH ANY PRECIPITATION..........3 

 

 MEMORIAL DAY WEEKEND 

 AVERAGE HIGH/LOW.....93/67 

 4TH OF JULY 

 AVERAGE HIGH/LOW.....103/77 

 RECORD HIGH.....115 IN 1985 

 RECORD LOW.......60 IN 1941 

 MOST PRECIPITATION EVER.....0.16 IN 1949 

 DAYS OF MEASURABLE PRECIPITATION.....2 

 DAYS WITH ANY RAIN...................3

 LABOR DAY WEEKEND 

 AVERAGE HIGH/LOW.....99/70 

 HALLOWEEN 

 AVERAGE HIGH.....73/50 

 RECORD HIGH.....86 IN 1988 

 RECORD LOW......30 IN 1971 

 MOST PRECIPITATION EVER.....0.25 IN 1987 

 DAYS OF MEASURABLE PRECIPITATION.....6 

 DAYS WITH ANY RAIN...................7 

 

 THANKSGIVING 

 AVERAGE HIGH/LOW.....64/40 
46

HOLIDAY WEATHER (CONT) 

 CHRISTMAS 

 AVERAGE HIGH/LOW.....56/36 

 RECORD HIGH.....69 IN 1964 

 RECORD LOW......17 IN 1948 

 MOST PRECIPITATION EVER.....0.66 IN 1994 

 MOST SNOW EVER.....TRACE IN 1941 AND 1988 

 DAYS WITH MEASURABLE PRECIPITATION.....7 

 DAYS WITH ANY RAIN OR SNOW.............11 
47

CONSECUTIVE DAYS TEMPERATURES ABOVE/BELOW NORMAL

RECORD DAYS BELOW NORMAL 

46 days (12/27/1948 - 2/10/1949) 

42 days (7/07/1999 - 8/17/1999)

RECORD DAYS ABOVE NORMAL 

45 days (12/15/1985 - 1/29/1985)
48

ACKNOWLEDGMENTS 

I would like to thank the staff at NWSO Las Vegas for their encouragement and help 

during this project. I would like to also thank MIC Kim Runk and Stanley Czyzyk, 

SOO, for their review, comments, and guidance on completing this Technical 

Memorandum. 

We would like to thank all the observers down through WSO Las Vegas' existence. It 

is fascinating looking back at our historical database to see how detailed the 

records were 60 or more years ago.
77

8

87

16

92

19

99

31

109

38

116

48

117

56

116

54

113

43

103

26

87

15

78

11

0

20

40

60

80

100

120

Degrees Fahrenheit

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Record Max/Min Temperature

Record Max Record Min

 Las Vegas, NV 

Figure 1. Record Maximum/Minimum Temperature in Las Vegas. 

 (1937-1948 at Nellis) (1949-2004 at McCarran). 

 

49
2.45

4.90

7.30

5.34

10.72

2.39

4.24

2.20

4.63

3.38

2.72

0.76

4.42

2.34

2.78

5.55

0.56

4.71

5.40

2.04

4.98

4.52

4.17

4.40

3.17

1.45

3.87

1.12

7.96

1.91

5.54

1.11

5.09

4.29

2.54

4.854.684.52

3.47

6.77

3.97

7.65

6.79

5.63

3.14

3.99

4.86

6.85

1.27

2.65

6.59

2.292.11

3.75

4.06

9.88

5.05

2.56

3.69

2.76

3.63

7.35

3.73

3.47

3.94

1.44

6.86

7.76

0

2

4

6

8

10

12

Inches

19371938193919401941194219431944194519461947194819491950195119521953195419551956195719581959196019611962196319641965196619671968196919701971197219731974197519761977197819791980198119821983198419851986198719881989199019911992199319941995199619971998199920002001200220032004

ANNUAL PRECIPITATION AT LAS VEGAS

 

 1937-2004 

Figure 2. Annual Precipitation (in inches) at Las Vegas, NV 

 (1937-1948 at Nellis)(1949-2004 at McCarran). 

50
57

52

47

35

33

24

28

33

34

38

45

52

33

28

24

17 15

11

15 17 18 20

26

31

0

10

20

30

40

50

60

Percent

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Average RH

RH @ 4 P.M. RH @ 4 A.M.

Figure 3. Average Relative Humidity at 4:00 a.m. and 4:00 p.m. PST 

 for McCarran International Airport, Las Vegas, NV 

 (1971-2000). 

 

51
0.0

0.2

0.4 0.5

1.0 1.0

3.8 3.7

1.5

0.5

0.2

0.0

0

0.5

1

1.5

2

2.5

3

3.5

4

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Avg. # of Thunderstorm Days

Las Vegas, NV 

Figure 4. Average Number of Thunderstorm Days for McCarran 

 International Airport, Las Vegas, NV. (1971-2000). 

52
0.0 0.0 0.0

3.5

15.0

26.3

30.3 29.8

22.2

6.0

0.0 0.0

0.0 0.0 0.0 0.0

2.2

15.8

25.0

21.8

7.5

0.1 0.0 0.0

0

5

10

15

20

25

30

35

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Avg 90/100 Degree Days

Days GTE 100 Days GTE 90

Las Vegas, NV 

Figure 5. Average number of 90 and 100 degree days at McCarran 

 International Airport, Las Vegas, NV (1971-2000). 

53
3.00 2.89

4.80

2.44

0.96 0.97

2.48 2.59

3.39

1.22

2.22 2.10

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

Inches

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Monthly Precipitation Extremes

Monthly Precipitation Extremes

Las Vegas, NV 

Figure 6. Monthly Precipitation Extremes for Las Vegas. 

 (1937-1948 at Nellis) (1949-2004 at McCarran). 

54
58

73

82

69

73

67

75

90

73 71 70 68

0

10

20

30

40

50

60

70

80

90

MPH

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Record Monthly Peak Wind Gust

Wind Gusts

Las Vegas, NV 

Figure 7. Peak Wind Gusts per Month recorded at McCarran 

 International Airport, Las Vegas, NV. 

55
65.7

66.3

66.1

66.6

67.5

68.2

64

64.5

65

65.5

66

66.5

67

67.5

68

68.5

Degrees (F)

1940's 1950's 1960's 1970's 1980's 1990's

Average Las Vegas Temperature by Decade

Average Temperature by Decade

Figure 8. Average yearly Las Vegas temperature by decade recorded 

 at McCarran International Airport, Las Vegas, NV. 

16,414 48,589 127,016

273,288

463,087

768,203

1,428,690

0

200,000

400,000

600,000

800,000

1,000,000

1,200,000

1,400,000

1,600,000

1940 1950 1960 1970 1980 1990 2000

Clark County Nevada Population

Clark County, NV Population

Figure 9. Population of Clark County, NV. 

56
50.3

52.2

52.7

53.3

54.9

56.4

47

48

49

50

51

52

53

54

55

56

57

Degrees (F)

1940's 1950's 1960's 1970's 1980's 1990's

Average Las Vegas Minimum Temperature by

Decade

Average Minimum Temperature by Decade

Figure 10. Average yearly Las Vegas minimum temperature by decade 

 recorded at McCarran International Airport, Las Vegas, 

 NV. 

81.3

80.2

79.2

79.7 79.9 79.9

74

75

76

77

78

79

80

81

82

83

84

Degrees (

F)

1940's 1950's 1960's 1970's 1980's 1990's

Average Las Vegas Maximum Temperature by

Decade

Average Maximum Temperature by Decade

Figure 11. Average yearly Las Vegas maximum temperature by decade 

 recorded at McCarran International Airport, Las Vegas, 

 NV. 

57
0.59

0.69

0.59

0.15

0.24

0.08

0.44 0.45

0.31

0.24

0.31

0.40

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

Inches

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Las Vegas Normal Monthly

Precipitation

Precipitation

Figure 12. Normal Monthly Las Vegas Precipitation (1971-2000). 

 Official readings taken at McCarran International 

 Airport. 

58
NOAA SCIENTIFIC AND TECHNICAL PUBLICATIONS

The National Oceanic and Atmospheric Administration was established as part of the Department of Commerce on

October 3, 1970. The mission responsibilities of NOAA are to assess the socioeconomic impact of natural and 

technological changes in the environment and to monitor and predict the state of the solid Earth, the oceans and 

their living resources, the atmosphere, and the space environment of the Earth. 

The major components of NOAA regularly produce various types of scientific and technical information in the 

following kinds of publications. 

PROFESSIONAL PAPERS--Important definitive research results, major techniques, and 

special investigations. 

CONTRACT AND GRANT REPORTS--Reports 

prepared by contractors or grantees under 

NOAA sponsorship. 

ATLAS--Presentation of analyzed data generally in the form of maps showing distribution 

of rainfall, chemical and physical conditions of 

oceans and atmosphere, distribution of fishes 

and marine mammals, ionospheric conditions, 

etc. 

TECHNICAL SERVICE PUBLICATIONS -- 

Reports containing data, observations, 

instructions, etc. A partial listing includes data 

serials; prediction and outlook periodicals; 

technical manuals, training papers, planning 

reports, and information serials; and 

miscellaneous technical publications. 

TECHNICAL REPORTS--Journal quality with 

extensive details, mathematical developments, 

or data listings. 

TECHNICAL MEMORANDUMS--Reports of 

preliminary, partial, or negative research or 

technology results, interim instructions, and the 

like. 

 

 

Information on availability of NOAA publications can be obtained from: 

NATIONAL TECHNICAL INFORMATION SERVICE 

U. S. DEPARTMENT OF COMMERCE 

5285 PORT ROYAL ROAD 

SPRINGFIELD, VA 22161

59
60