510  
CDUS45 KRIW 300729  
CLIP60  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE RIVERTON WY  
129 AM MDT SAT SEP 30 2023  
   
...............................
 
 
   
..THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR SEPTEMBER 29 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 58 2:38 PM 70 2010 54 4 59  
MINIMUM 26 5:28 AM 24 2005 27 -1 35  
2020  
AVERAGE 42 41 1 47  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.33 2002 0.06 -0.06 0.11  
MONTH TO DATE 3.62 1.52 2.10 1.62  
SINCE SEP 1 3.62 1.52 2.10 1.62  
SINCE JAN 1 21.65 16.78 4.87 19.63  
 
DEGREE DAYS  
HEATING  
YESTERDAY 23 24 -1 18  
MONTH TO DATE 480 563 -83 432  
SINCE SEP 1 480 563 -83 432  
SINCE JUL 1 1013 1205 -192 876  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE SEP 1 0 0 0 0  
SINCE JAN 1 0 0 0 0    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION W (280)  
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION SW (220)  
AVERAGE WIND SPEED 2.2  
 
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 92 1:00 AM  
LOWEST 28 2:00 PM  
AVERAGE 60  
   
......................................................
 
 
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 53 72 2011  
MINIMUM TEMPERATURE (F) 27 20 2021  
 
SUNRISE AND SUNSET  
SEPTEMBER 30 2023.....SUNRISE 7:18 AM MDT SUNSET 7:04 PM MDT  
OCTOBER 1 2023.......SUNRISE 7:19 AM MDT SUNSET 7:02 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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