071  
CDUS45 KRIW 310728  
CLIRIW  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE RIVERTON WY  
128 AM MDT SUN AUG 31 2025  
   
...............................
 
 
   
..THE RIVERTON WY CLIMATE SUMMARY FOR AUGUST 30 2025
 
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1995 TO 2025  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 78 2:28 PM 92 1999 81 -3 83  
2008  
2013  
MINIMUM 52 5:44 AM 42 2020 50 2 45  
AVERAGE 65 66 -1 64  
 
PRECIPITATION (IN)  
YESTERDAY 0.02 0.60 0.02 0.00 0.00  
MONTH TO DATE 0.52 0.41 0.11 0.32  
SINCE JUN 1 1.73 1.89 -0.16 0.79  
SINCE JAN 1 6.25 6.35 -0.10 5.43  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.0 2020 0.0  
MONTH TO DATE 0.0 0.0  
SINCE JUN 1 0.0 0.0  
SINCE JUL 1 0.0 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 2 -2 1  
MONTH TO DATE 3 22 -19 11  
SINCE JUN 1 81 147 -66 51  
SINCE JUL 1 3 32 -29 18  
 
COOLING  
YESTERDAY 0 3 -3 0  
MONTH TO DATE 182 167 15 183  
SINCE JUN 1 567 458 109 538  
SINCE JAN 1 573 466 107 538    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION NE (60)  
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION SE (120)  
AVERAGE WIND SPEED 8.0  
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.2  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 5:00 AM  
LOWEST 31 5:00 PM  
AVERAGE 64  
   
......................................................
 
 
THE RIVERTON WY CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 81 92 1996  
2011  
2022  
MINIMUM TEMPERATURE (F) 50 36 2020  
 
SUNRISE AND SUNSET  
AUGUST 31 2025........SUNRISE 6:38 AM MDT SUNSET 7:50 PM MDT  
SEPTEMBER 1 2025.....SUNRISE 6:39 AM MDT SUNSET 7:48 PM MDT  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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