015
CDUS46 KMTR 180834
CLIAPC
CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
1234 AM PST THU DEC 18 2025
...............................
..THE NAPA AIRPORT CLIMATE SUMMARY FOR DECEMBER 17 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 62 3:01 PM 66 2000 57 5 MM
2017
MINIMUM 42 10:20 PM 24 2008 37 5 MM
AVERAGE 52 47 5 MM
PRECIPITATION (IN)
YESTERDAY 0.18 MM
MONTH TO DATE 0.18 1.13
SINCE OCT 1 3.64 5.39
SINCE JAN 1 11.96 19.23
DEGREE DAYS
HEATING
YESTERDAY 13 MM
MONTH TO DATE 327 177
SINCE DEC 1 327 177
SINCE JUL 1 802 717
COOLING
YESTERDAY 0 MM
MONTH TO DATE 0 0
SINCE DEC 1 0 0
SINCE JAN 1 211 444
...............................................................
WIND (MPH)
RESULTANT WIND SPEED 5 RESULTANT WIND DIRECTION S (180)
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION S (190)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION S (190)
AVERAGE WIND SPEED 6.8
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
RAIN
LIGHT RAIN
FOG
FOG W/VISIBILITY <= 1/4 MILE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 4:00 AM
LOWEST 86 4:00 PM
AVERAGE 93
......................................................
THE NAPA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 57 63 2017
MINIMUM TEMPERATURE (F) 37 21 2006
SUNRISE AND SUNSET
DECEMBER 18 2025......SUNRISE 7:21 AM PST SUNSET 4:51 PM PST
DECEMBER 19 2025......SUNRISE 7:21 AM PST SUNSET 4:52 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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