656  
CDUS45 KRIW 210733  
CLIP60  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE RIVERTON WY  
133 AM MDT WED MAY 21 2025  
   
...............................
 
 
   
..THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR MAY 20 2025
 
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1998 TO 2025  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 44 4:42 PM 66 2002 52 -8 44  
MINIMUM 27 6:05 AM 17 2003 28 -1 22  
AVERAGE 36 40 -4 33  
 
PRECIPITATION (IN)  
YESTERDAY 0.49R 0.28 2005 0.08 0.41 0.00  
MONTH TO DATE 2.26 1.39 0.87 1.08  
SINCE MAR 1 5.34 5.57 -0.23 6.41  
SINCE JAN 1 9.04 9.07 -0.03 10.88  
 
DEGREE DAYS  
HEATING  
YESTERDAY 29 25 4 32  
MONTH TO DATE 504 564 -60 488  
SINCE MAR 1 1699 3010 -1311 2640  
SINCE JUL 1 8619 11214 -2595 10114  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE MAR 1 0 0 0 0  
SINCE JAN 1 0 0 0 0    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION W (290)  
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION W (290)  
AVERAGE WIND SPEED 1.3  
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 8:00 PM  
LOWEST 53 5:00 PM  
AVERAGE 75  
   
......................................................
 
 
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 52 68 2012  
MINIMUM TEMPERATURE (F) 28 17 2001  
 
SUNRISE AND SUNSET  
MAY 21 2025...........SUNRISE 5:48 AM MDT SUNSET 8:50 PM MDT  
MAY 22 2025...........SUNRISE 5:47 AM MDT SUNSET 8:51 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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