Climatological Report (Monthly)
Issued by NWS

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CXUS56 KMTR 011005
CLMSFO


CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
203 AM PST MON JAN 1 2018

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

...THE SAN FRANCISCO AIRPORT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

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            66   12/05                         63  12/09
LOWEST             38   12/22                         36  12/19
AVG. MAXIMUM     59.5              56.6     2.9     56.8
AVG. MINIMUM     44.3                               44.5
MEAN             51.9              50.6     1.3     50.7
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           0.07              4.03   -3.96     4.63
DAILY AVG.       0.00              0.13   -0.13     0.15
DAYS >= .01         3                                  8
DAYS >= .10         0                                  5
DAYS >= .50         0                                  4
DAYS >= 1.00        0                                  2
GREATEST
 24 HR. TOTAL    0.04   12/20 TO 12/20           12/07 TO 12/08
                                                          12/31 TO 12/31
                                                          12/31 TO 12/31

DEGREE_DAYS
HEATING TOTAL     399               446     -47      437
 SINCE 7/1        738              1010    -272      851
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        346               164     182      142
..................................................

WIND (MPH)
AVERAGE WIND SPEED              5.1
RESULTANT WIND SPEED/DIRECTION   1/341
HIGHEST WIND SPEED/DIRECTION    31/340    DATE  12/16
HIGHEST GUST SPEED/DIRECTION    40/340    DATE  12/16

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.40
NUMBER OF DAYS FAIR           15
NUMBER OF DAYS PC             15
NUMBER OF DAYS CLOUDY          1

AVERAGE RH (PERCENT)     64

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                3     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       7     FOG W/VIS <= 1/4 MILE      1
HAZE                      5

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

$$


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