719  
CDUS45 KRIW 150731  
CLIP60  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE RIVERTON WY  
131 AM MDT THU MAY 15 2025  
   
...............................
 
 
   
..THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR MAY 14 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 43 2:50 PM 64 2006 50 -7 41  
2013  
MINIMUM 30 6:11 AM 16 1999 26 4 29  
AVERAGE 37 38 -1 35  
 
PRECIPITATION (IN)  
YESTERDAY 0.11 0.32 2009 0.08 0.03 0.26  
MONTH TO DATE 0.27 0.93 -0.66 1.08  
SINCE MAR 1 3.35 5.11 -1.76 6.41  
SINCE JAN 1 7.05 8.61 -1.56 10.88  
 
DEGREE DAYS  
HEATING  
YESTERDAY 28 27 1 30  
MONTH TO DATE 332 409 -77 366  
SINCE MAR 1 1527 2855 -1328 2518  
SINCE JUL 1 8447 11059 -2612 9992  
 
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 (270)  
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION W (280)  
AVERAGE WIND SPEED 2.9  
 
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 92 10:00 PM  
LOWEST 44 3:00 PM  
AVERAGE 68  
   
......................................................
 
 
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 50 65 2013  
MINIMUM TEMPERATURE (F) 26 19 1999  
 
SUNRISE AND SUNSET  
MAY 15 2025...........SUNRISE 5:54 AM MDT SUNSET 8:43 PM MDT  
MAY 16 2025...........SUNRISE 5:52 AM MDT SUNSET 8:44 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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