Climatological Report (Monthly)
Issued by NWS
Issued by NWS
092
CXUS56 KMTR 010839
CLMAPC
CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
1239 AM PST WED JAN 01 2025
...................................
...THE NAPA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2024...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2024
WEATHER OBSERVED NORMAL DEPART LAST YEAR`S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
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TEMPERATURE (F)
RECORD
HIGH 78 MM
LOW 16 12/05/2013
HIGHEST 67 12/04 70 12/16
12/06
12/08
LOWEST 29 12/09 30 12/09
AVG. MAXIMUM 59.9 61.3
AVG. MINIMUM 41.1 41.8
MEAN 50.5 51.5
DAYS MAX >= 90 0 0
DAYS MAX <= 32 0 0
DAYS MIN <= 32 1 4
DAYS MIN <= 0 0 0
PRECIPITATION (INCHES)
TOTALS 3.72 3.82 -0.10 4.33
DAILY AVG. 0.14 0.14
DAYS >= .01 11 11
DAYS >= .10 7 8
DAYS >= .50 3 4
DAYS >= 1.00 0 1
GREATEST
24 HR. TOTAL 0.98 12/26 TO 12/27 1.52 12/18 TO 12/19
DEGREE DAYS
HEATING TOTAL 385 411
SINCE 7/1 925 MM
COOLING TOTAL 0 0
SINCE 1/1 444 MM
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WIND (MPH)
AVERAGE WIND SPEED 6.3
RESULTANT WIND SPEED/DIRECTION 3/120
HIGHEST WIND SPEED/DIRECTION 32/270 DATE 12/24
HIGHEST GUST SPEED/DIRECTION 42/290 DATE 12/24
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.39
NUMBER OF DAYS FAIR 15
NUMBER OF DAYS PC 5
NUMBER OF DAYS CLOUDY 7
AVERAGE RH (PERCENT) 80
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 0 MIXED PRECIP 0
HEAVY RAIN 5 RAIN 9
LIGHT RAIN 12 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 22 FOG W/VIS <= 1/4 MILE 5
HAZE 6
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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