508  
CDUS45 KRIW 170742  
CLIP60  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE RIVERTON WY  
142 AM MDT SAT MAY 17 2025  
   
...............................  
 
   
..THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR MAY 16 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 42 MM 69 2006 51 -9 58  
MINIMUM 27 3:00 AM 22 2009 27 0 28  
AVERAGE 35 39 -4 43  
 
PRECIPITATION (IN)  
YESTERDAY 0.07 0.50 2004 0.08 -0.01 0.00  
MONTH TO DATE 0.72 1.08 -0.36 1.08  
SINCE MAR 1 3.80 5.26 -1.46 6.41  
SINCE JAN 1 7.50 8.76 -1.26 10.88  
 
DEGREE DAYS  
HEATING  
YESTERDAY 30 26 4 22  
MONTH TO DATE 391 462 -71 413  
SINCE MAR 1 1586 2908 -1322 2565  
SINCE JUL 1 8506 11112 -2606 10039  
 
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 6 HIGHEST WIND DIRECTION E (99)  
HIGHEST GUST SPEED MM HIGHEST GUST DIRECTION MM  
AVERAGE WIND SPEED 1.2  
 
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 1:00 AM  
LOWEST 64 3:00 PM  
AVERAGE 80  
   
......................................................  
 
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 51 69 2007  
MINIMUM TEMPERATURE (F) 27 18 1999  
 
SUNRISE AND SUNSET  
MAY 17 2025...........SUNRISE 5:51 AM MDT SUNSET 8:45 PM MDT  
MAY 18 2025...........SUNRISE 5:50 AM MDT SUNSET 8:46 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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