139  
CDUS46 KMTR 200845  
CLIAPC  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA  
145 AM PDT SAT SEP 20 2025  
   
...............................  
 
   
..THE NAPA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 19 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 78 3:40 PM 97 2002 80 -2 72  
MINIMUM 58 7:18 AM 41 2008 51 7 53  
AVERAGE 68 65 3 63  
 
PRECIPITATION (IN)  
YESTERDAY T 0.00  
MONTH TO DATE T T  
SINCE OCT 1 16.08 19.88  
SINCE JAN 1 8.10 13.84  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 2  
MONTH TO DATE 1 15  
SINCE SEP 1 1 15  
SINCE JUL 1 46 28  
 
COOLING  
YESTERDAY 3 0  
MONTH TO DATE 58 36  
SINCE SEP 1 58 36  
SINCE JAN 1 169 337    
...............................................................  
 
WIND (MPH)  
RESULTANT WIND SPEED 6 RESULTANT WIND DIRECTION SW (220)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION SW (210)  
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION SW (210)  
AVERAGE WIND SPEED 7.2  
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 3:00 AM  
LOWEST 50 1:00 PM  
AVERAGE 72  
   
......................................................  
 
THE NAPA AIRPORT CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 80 97 2011  
MINIMUM TEMPERATURE (F) 50 38 2004  
 
SUNRISE AND SUNSET  
SEPTEMBER 20 2025.....SUNRISE 6:55 AM PDT SUNSET 7:09 PM PDT  
SEPTEMBER 21 2025.....SUNRISE 6:56 AM PDT SUNSET 7:07 PM PDT  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 
 
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