975  
CXUS55 KRIW 021728 RRA  
CLMLND  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE RIVERTON WY  
1111 AM MDT MON JUN 02 2025  
 
...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LANDER FOR THE MONTH OF  
MAY 2025...  
 
...OFFICIAL CLIMATE DATA FOR THE MONTH OF MAY 2025 WILL BE AVAILABLE  
IN APPROXIMATELY 60 DAYS FROM THE NATIONAL CENTERS FOR ENVIRONMENTAL  
INFORMATION (HTTP://WWW.NCDC.NOAA.GOV/CDO-WEB/DATASETS). UNOFFICIAL  
ASOS DAILY SUMMARIES ARE AVAILABLE ON THE INTERNET AT  
HTTP://WWW.WEATHER.GOV/CLIMATE/INDEX.PHP?WFO=RIW  
   
..LANDER WAS WARMER AND DRIER THAN NORMAL IN MAY.
 
 
THE AVERAGE TEMPERATURE FOR LANDER IN MAY WAS 54.6 DEGREES WHICH WAS  
1.8 DEGREES ABOVE NORMAL. THE WARMEST READING FOR THE MONTH WAS 83  
DEGREES ON THE 30TH. THE COLDEST TEMPERATURE WAS 32 DEGREES ON THE  
2ND...6TH AND 16TH. NO TEMPERATURE RECORDS WERE BROKEN THIS MONTH.  
 
PRECIPITATION FOR THE MONTH WAS 1.88 INCHES...WHICH IS 70 PERCENT OF  
NORMAL. THE WETTEST 24-HOUR PERIOD WAS THE 5TH-6TH WHEN 1.23 INCHES  
OF PRECIPITATION FELL. NO PRECIPITATION OR SNOWFALL RECORDS WERE  
BROKEN THIS MONTH..  
 
SNOWFALL FOR THE MONTH WAS 3.4 INCHES. THIS IS 76 PERCENT OF NORMAL.  
THE SNOWIEST 24-HOUR PERIOD WAS THE 5TH-6TH WITH 3.4 INCHES. THE  
HIGHEST WIND GUST WAS 62 MPH AND OCCURRED ON THE 12TH FROM THE  
SOUTHWEST. THE 11TH HAD A PEAK GUST OF 61 MPH FROM THE SOUTHWEST.  
   
..THE LANDER WY CLIMATE SUMMARY FOR THE MONTH OF MAY 2025
 
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1891 TO 2025  
 
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S  
VALUE DATE(S) VALUE FROM VALUE  
NORMAL    
..........................................................
 
 
TEMPERATURE (F)  
RECORD  
HIGH 93 05/29/2003  
LOW 13 05/02/1903  
HIGHEST 83 05/30  
LOWEST 32 05/02  
05/06  
05/16  
AVG. MAXIMUM 68.2 66.1 2.1  
AVG. MINIMUM 41.0 39.4 1.6  
MEAN 54.6 52.8 1.8  
DAYS MAX >= 90 0  
DAYS MAX <= 32 0  
DAYS MIN <= 32 4  
DAYS MIN <= 0 0  
 
PRECIPITATION (INCHES)  
RECORD  
MAXIMUM 6.77 2011  
MINIMUM 0.06 2020  
TOTALS 1.88 2.68 -0.80 1.38  
DAILY AVG. 0.06 0.09 -0.03  
DAYS >= .01 10  
DAYS >= .10 4  
DAYS >= .50 1  
DAYS >= 1.00 0  
GREATEST  
24 HR. TOTAL 1.23 05/05 TO 05/06  
STORM TOTAL 0.78  
 
SNOWFALL (INCHES)  
TOTALS 3.4 4.5 -1.1  
SINCE 7/1 79.0 87.5 -8.5  
SNOWDEPTH AVG. 0  
DAYS >= 1.0 2  
 
DEGREE DAYS  
HEATING TOTAL 324 385 -61  
SINCE 7/1 6812 7588 -776  
COOLING TOTAL 8 5 3  
SINCE 1/1 8 5 3    
..........................................................
 
 
WIND (MPH)  
AVERAGE WIND SPEED 6.5  
RESULTANT WIND SPEED/DIRECTION 1/240  
HIGHEST WIND SPEED/DIRECTION 43/220 DATE 05/11  
HIGHEST GUST SPEED/DIRECTION 62/210 DATE 05/12  
 
SKY COVER  
POSSIBLE SUNSHINE (PERCENT) MM  
AVERAGE SKY COVER 0.27  
NUMBER OF DAYS FAIR 21  
NUMBER OF DAYS PC 6  
NUMBER OF DAYS CLOUDY 2  
 
AVERAGE RH (PERCENT) 53  
 
WEATHER CONDITIONS. NUMBER OF DAYS WITH  
THUNDERSTORM 6 MIXED PRECIP 0  
HEAVY RAIN 1 RAIN 1  
LIGHT RAIN 14 FREEZING RAIN 0  
LT FREEZING RAIN 0 HAIL 0  
HEAVY SNOW 1 SNOW 2  
LIGHT SNOW 2 SLEET 0  
FOG 4 FOG W/VIS <= 1/4 MILE 1  
HAZE 2  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 
LOOKING AHEAD TO JUNE 2025. THE AVERAGE HIGH TEMPERATURE ON THE  
FIRST OF THE MONTH IS 72 DEGREES...AND THE AVERAGE LOW TEMPERATURE  
IS 44 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 84  
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 52. THE AVERAGE MONTHLY  
PRECIPITATION IS 1.08 INCHES. THE AVERAGE SNOWFALL IS 0.1 INCHES.  
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab WY Page Main Text Page