Climatological Report (Monthly)
Issued by NWS

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CXUS56 KMTR 021519
CLMSFO


CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
718 AM PST MON JAN 2 2017

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

...THE SAN FRANCISCO AIRPORT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1927 TO 2017

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            63   12/09                         65  12/09
LOWEST             36   12/19                         34  12/27
AVG. MAXIMUM     56.8              56.6     0.2     55.8
AVG. MINIMUM     44.5                               45.2
MEAN             50.7              50.6     0.1     50.5
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           4.63              4.03    0.60     3.37
DAILY AVG.       0.15              0.13    0.02     0.11
DAYS >= .01         8                                 14
DAYS >= .10         5                                 10
DAYS >= .50         4                                  2
DAYS >= 1.00        2                                  0
GREATEST
 24 HR. TOTAL    1.74   12/07 TO 12/08           12/21 TO 12/22
                                                          12/31 TO 12/31
                                                          12/31 TO 12/31

DEGREE_DAYS
HEATING TOTAL     437               446      -9      443
 SINCE 7/1        851              1010    -159      800
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        142               164     -22      327
..................................................

WIND (MPH)
AVERAGE WIND SPEED              7.7
RESULTANT WIND SPEED/DIRECTION   2/298
HIGHEST WIND SPEED/DIRECTION    37/170    DATE  12/15
HIGHEST GUST SPEED/DIRECTION    47/180    DATE  12/15

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR           13
NUMBER OF DAYS PC              9
NUMBER OF DAYS CLOUDY          9

AVERAGE RH (PERCENT)     70

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       4
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       8     FOG W/VIS <= 1/4 MILE      0
HAZE                      3

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

$$


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