825
CXUS56 KMTR 010834
CLMAPC

CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
1234 AM PST THU JAN 01 2026

...................................

...THE NAPA AIRPORT  CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2025...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2025

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             78   MM
 LOW              16   12/05/2013
HIGHEST           67   12/03                          67  12/04
                                                          12/06
                                                          12/08
LOWEST            33   12/28                          29  12/09
                       12/29
AVG. MAXIMUM    54.5                                59.0
AVG. MINIMUM    42.4                                40.9
MEAN            48.4                                50.0
DAYS MAX >= 90     0                                   0
DAYS MAX <= 32     0                                   0
DAYS MIN <= 32     0                                   1
DAYS MIN <= 0      0                                   0

PRECIPITATION (INCHES)
TOTALS          3.97               3.82    0.15     5.93
DAILY AVG.      0.13                                0.14
DAYS >= .01       10                                  13
DAYS >= .10        9                                   9
DAYS >= .50        3                                   5
DAYS >= 1.00       1                                   1
GREATEST
 24 HR. TOTAL   1.24   12/24 TO 12/25               1.65  12/13 TO 12/14


DEGREE DAYS
HEATING TOTAL    505                                 458
 SINCE 7/1       980                                  MM
COOLING TOTAL      0                                   0
 SINCE 1/1       211                                  MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              8.2
RESULTANT WIND SPEED/DIRECTION   6/110
HIGHEST WIND SPEED/DIRECTION    32/140    DATE  12/25
HIGHEST GUST SPEED/DIRECTION    44/140    DATE  12/25

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.64
NUMBER OF DAYS FAIR            8
NUMBER OF DAYS PC              8
NUMBER OF DAYS CLOUDY         15

AVERAGE RH (PERCENT)     88

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                3     RAIN                       8
LIGHT RAIN               13     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      31     FOG W/VIS <= 1/4 MILE      6
HAZE                      4

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

$$