606  
CDUS46 KMTR 240831  
CLIAPC  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA  
131 AM PDT WED SEP 24 2025  
   
...............................  
 
   
..THE NAPA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 23 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 96R 5:01 PM 94 2002 80 16 94  
2024  
MINIMUM 56 5:45 AM 39 2005 50 6 47  
AVERAGE 76 65 11 71  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 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 0  
MONTH TO DATE 1 20  
SINCE SEP 1 1 20  
SINCE JUL 1 46 33  
 
COOLING  
YESTERDAY 11 6  
MONTH TO DATE 76 42  
SINCE SEP 1 76 42  
SINCE JAN 1 187 343    
...............................................................  
 
WIND (MPH)  
RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION SW (210)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION S (170)  
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION S (180)  
AVERAGE WIND SPEED 4.7  
 
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 6:00 AM  
LOWEST 20 4:00 PM  
AVERAGE 58  
   
......................................................  
 
THE NAPA AIRPORT CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 80 96 2019  
MINIMUM TEMPERATURE (F) 50 40 2005  
2017  
 
SUNRISE AND SUNSET  
SEPTEMBER 24 2025.....SUNRISE 6:59 AM PDT SUNSET 7:02 PM PDT  
SEPTEMBER 25 2025.....SUNRISE 7:00 AM PDT SUNSET 7:01 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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