757
CDUS46 KMTR 190829
CLIAPC
CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
1229 AM PST FRI DEC 19 2025
...............................
..THE NAPA AIRPORT CLIMATE SUMMARY FOR DECEMBER 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 58 3:25 PM 63 2017 57 1 55
MINIMUM 47 1:08 AM 21 2006 37 10 36
AVERAGE 53 47 6 46
PRECIPITATION (IN)
YESTERDAY T 0.00
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 12 19
MONTH TO DATE 339 196
SINCE DEC 1 339 196
SINCE JUL 1 814 736
COOLING
YESTERDAY 0 0
MONTH TO DATE 0 0
SINCE DEC 1 0 0
SINCE JAN 1 211 444
...............................................................
WIND (MPH)
RESULTANT WIND SPEED 1 RESULTANT WIND DIRECTION NW (300)
HIGHEST WIND SPEED 7 HIGHEST WIND DIRECTION SW (220)
HIGHEST GUST SPEED 10 HIGHEST GUST DIRECTION SW (230)
AVERAGE WIND SPEED 2.0
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
FOG
FOG W/VISIBILITY <= 1/4 MILE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 12:00 AM
LOWEST 80 1:00 PM
AVERAGE 90
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THE NAPA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 57 78 1999
MINIMUM TEMPERATURE (F) 37 21 2006
SUNRISE AND SUNSET
DECEMBER 19 2025......SUNRISE 7:21 AM PST SUNSET 4:52 PM PST
DECEMBER 20 2025......SUNRISE 7:22 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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