464  
CDUS46 KMTR 190036  
CLIAPC  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA  
436 PM PST MON DEC 18 2023  
   
...............................
 
 
   
..THE NAPA AIRPORT CLIMATE SUMMARY FOR DECEMBER 18 2023
 
 
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 56 2:56 PM 63 2017 57 -1 53  
MINIMUM 50 4:02 AM 21 2006 37 13 28  
AVERAGE 53 47 6 41  
 
PRECIPITATION (IN)  
TODAY 1.10 0.00  
MONTH TO DATE 1.91 2.87  
SINCE OCT 1 3.62 3.84  
SINCE JAN 1 24.83 7.30  
 
DEGREE DAYS  
HEATING  
TODAY 12 24  
MONTH TO DATE 259 337  
SINCE DEC 1 259 337  
SINCE JUL 1 665 937  
 
COOLING  
TODAY 0 0  
MONTH TO DATE 0 0  
SINCE DEC 1 0 0  
SINCE JAN 1 389 487    
...............................................................
 
 
WIND (MPH)  
RESULTANT WIND SPEED 15 RESULTANT WIND DIRECTION E (90)  
HIGHEST WIND SPEED 28 HIGHEST WIND DIRECTION E (80)  
HIGHEST GUST SPEED 36 HIGHEST GUST DIRECTION E (80)  
AVERAGE WIND SPEED 15.0  
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
THUNDERSTORM  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
HAZE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 90 2:00 PM  
LOWEST 80 8:00 AM  
AVERAGE 85  
   
......................................................
 
 
THE NAPA AIRPORT CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 57 78 1999  
MINIMUM TEMPERATURE (F) 37 21 2006  
 
SUNRISE AND SUNSET  
DECEMBER 18 2023......SUNRISE 7:20 AM PST SUNSET 4:51 PM PST  
DECEMBER 19 2023......SUNRISE 7:21 AM PST SUNSET 4:51 PM PST  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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