450  
CDUS45 KRIW 190802  
CLIP60  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE RIVERTON WY  
102 AM MST TUE DEC 19 2023  
   
...............................
 
 
   
..THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR DECEMBER 18 2023
 
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1998 TO 2023  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 30 11:19 PM 34 2013 23 7 20  
MINIMUM 2 6:33 AM -23 2016 2 0 -5  
AVERAGE 16 12 4 8  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.35 2015 0.08 -0.08 0.00  
MONTH TO DATE 1.03 1.32 -0.29 1.74  
SINCE DEC 1 1.03 1.32 -0.29 1.74  
SINCE JAN 1 27.13 22.06 5.07 26.52  
 
DEGREE DAYS  
HEATING  
YESTERDAY 49 53 -4 57  
MONTH TO DATE 836 923 -87 943  
SINCE DEC 1 836 923 -87 943  
SINCE JUL 1 3910 4430 -520 4163  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 0 0 0 0    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION W (270)  
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION SW (230)  
AVERAGE WIND SPEED 0.8  
 
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 95 10:00 AM  
LOWEST 63 11:00 PM  
AVERAGE 79  
   
......................................................
 
 
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 23 30 2004  
MINIMUM TEMPERATURE (F) 2 -20 2012  
 
SUNRISE AND SUNSET  
DECEMBER 19 2023......SUNRISE 7:54 AM MST SUNSET 4:44 PM MST  
DECEMBER 20 2023......SUNRISE 7:54 AM MST SUNSET 4:44 PM MST  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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