152  
CDUS46 KMTR 190830  
CLIAPC  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA  
130 AM PDT FRI SEP 19 2025  
   
...............................
 
 
   
..THE NAPA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 18 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 73 4:52 PM 98 2016 80 -7 73  
MINIMUM 61 11:59 PM 38 2008 51 10 54  
AVERAGE 67 66 1 64  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 T  
MONTH TO DATE T T  
SINCE OCT 1 16.08 19.88  
SINCE JAN 1 8.10 13.84  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 1  
MONTH TO DATE 1 13  
SINCE SEP 1 1 13  
SINCE JUL 1 46 26  
 
COOLING  
YESTERDAY 2 0  
MONTH TO DATE 55 36  
SINCE SEP 1 55 36  
SINCE JAN 1 166 337    
...............................................................
 
 
WIND (MPH)  
RESULTANT WIND SPEED 9 RESULTANT WIND DIRECTION S (190)  
HIGHEST WIND SPEED 24 HIGHEST WIND DIRECTION S (190)  
HIGHEST GUST SPEED 32 HIGHEST GUST DIRECTION S (200)  
AVERAGE WIND SPEED 9.8  
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.1  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 90 11:00 PM  
LOWEST 63 12:00 PM  
AVERAGE 77  
   
......................................................
 
 
THE NAPA AIRPORT CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 80 97 2002  
MINIMUM TEMPERATURE (F) 51 41 2008  
 
SUNRISE AND SUNSET  
SEPTEMBER 19 2025.....SUNRISE 6:55 AM PDT SUNSET 7:10 PM PDT  
SEPTEMBER 20 2025.....SUNRISE 6:55 AM PDT SUNSET 7:09 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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