820
CXUS56 KMTR 010834
CLMSTS

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

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

...THE SANTA ROSA 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   12/15/2013
                       12/19/1999
                       12/04/1958
 LOW              19   12/09/2013
HIGHEST           69   12/03                          71  12/06
                                                          12/08
LOWEST            31   12/29                          28  12/10
AVG. MAXIMUM    56.0               57.5    -1.5     60.3
AVG. MINIMUM    40.8               36.9     3.9     41.0
MEAN            48.4               47.2     1.2     50.7
DAYS MAX >= 90     0                0.0     0.0        0
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     2               10.9    -8.9        3
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       17.95   2005
 MINIMUM        0.08   2017
TOTALS          6.05                                9.68
DAILY AVG.      0.20                                0.31
DAYS >= .01       11                                  14
DAYS >= .10       10                                  12
DAYS >= .50        5                                   6
DAYS >= 1.00       1                                   4
GREATEST
 24 HR. TOTAL   1.80   12/20 TO 12/21               3.06  12/13 TO 12/14


DEGREE DAYS
HEATING TOTAL    506                                 440
 SINCE 7/1       951                                  MM
COOLING TOTAL      0                                   0
 SINCE 1/1       401                                  MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              3.4
RESULTANT WIND SPEED/DIRECTION   2/170
HIGHEST WIND SPEED/DIRECTION    33/170    DATE  12/25
HIGHEST GUST SPEED/DIRECTION    55/190    DATE  12/25

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.72
NUMBER OF DAYS FAIR            2
NUMBER OF DAYS PC             13
NUMBER OF DAYS CLOUDY         16

AVERAGE RH (PERCENT)     87

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP               0
HEAVY RAIN                6     RAIN                      10
LIGHT RAIN               12     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     23
HAZE                     11

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

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