861
CXUS56 KMTR 010839
CLMSFO

CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
1239 AM PST WED JAN 01 2025

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

...THE SAN FRANCISCO AIRPORT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2024...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1927 TO 2024

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           67   12/03                          66  12/05
                       12/06
LOWEST            43   12/15                          43  12/09
                       12/31
AVG. MAXIMUM    60.6               58.2     2.4     61.9
AVG. MINIMUM    48.6                                50.0
MEAN            54.6               51.4     3.2     55.9
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          4.51               4.14    0.37     3.91
DAILY AVG.      0.15               0.13    0.02     0.13
DAYS >= .01       13                                  11
DAYS >= .10       10                                   7
DAYS >= .50        2                                   3
DAYS >= 1.00       1                                   1
GREATEST
 24 HR. TOTAL   1.88   12/13 TO 12/14               1.32  12/19 TO 12/20


DEGREE DAYS
HEATING TOTAL    310                422    -112      273
 SINCE 7/1       851                927     -76       MM
COOLING TOTAL      0                  0       0        0
 SINCE 1/1       184                201     -17       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              6.3
RESULTANT WIND SPEED/DIRECTION   1/220
HIGHEST WIND SPEED/DIRECTION    60/190    DATE  12/14
HIGHEST GUST SPEED/DIRECTION    83/190    DATE  12/14

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.58
NUMBER OF DAYS FAIR            7
NUMBER OF DAYS PC             14
NUMBER OF DAYS CLOUDY         10

AVERAGE RH (PERCENT)     80

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       6
LIGHT RAIN               12     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      26     FOG W/VIS <= 1/4 MILE      4
HAZE                     21

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

$$