818
CXUS56 KMTR 010834
CLMSFO

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

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

...THE SAN FRANCISCO AIRPORT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2025...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1927 TO 2025

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             75   12/12/1958
                       12/04/1958
                       12/02/1958
 LOW              24   12/09/1972
HIGHEST           65   12/22                          67  12/03
                                                          12/06
LOWEST            43   12/05                          43  12/15
                       12/13
                       12/28
                                                          12/31
AVG. MAXIMUM    57.2               58.2    -1.0     60.6
AVG. MINIMUM    47.9                                48.6
MEAN            52.5               51.4     1.1     54.6
DAYS MAX >= 90     0                                   0
DAYS MAX <= 32     0                                   0
DAYS MIN <= 32     0                                   0
DAYS MIN <= 0      0                                   0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       12.30   1955
 MINIMUM        0.01   1989
TOTALS          4.39               4.14    0.25     1.52
DAILY AVG.      0.14               0.13    0.01     0.15
DAYS >= .01       10                                   8
DAYS >= .10        8                                   6
DAYS >= .50        4                                   0
DAYS >= 1.00       1                                   0
GREATEST
 24 HR. TOTAL   1.16   12/24 TO 12/25               0.48  12/26 TO 12/27


DEGREE DAYS
HEATING TOTAL    379                422     -43      310
 SINCE 7/1       730                927    -197       MM
COOLING TOTAL      0                  0       0        0
 SINCE 1/1       150                201     -51       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              7.0
RESULTANT WIND SPEED/DIRECTION   2/110
HIGHEST WIND SPEED/DIRECTION    53/170    DATE  12/25
HIGHEST GUST SPEED/DIRECTION    72/230    DATE  12/25

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.57
NUMBER OF DAYS FAIR            7
NUMBER OF DAYS PC             13
NUMBER OF DAYS CLOUDY         11

AVERAGE RH (PERCENT)     81

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     MIXED PRECIP               0
HEAVY RAIN                3     RAIN                       6
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      29     FOG W/VIS <= 1/4 MILE      0
HAZE                     27

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

$$