Climatological Report (Monthly)
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000
CXUS56 KMTR 011005
CLMSTS


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

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

...THE SANTA ROSA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2017

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   12/17                         66  12/04
                                                          12/03
LOWEST             26   12/22                         25  12/18
AVG. MAXIMUM     61.2              56.3     4.9     57.2
AVG. MINIMUM     32.0              36.5    -4.5     34.4
MEAN             46.6              46.4     0.2     45.8
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32     19               9.7     9.3       15
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        17.95   2005
 MINIMUM         0.08   2017
TOTALS           0.08R                              6.75
DAILY AVG.       0.00                               0.22
DAYS >= .01         2                                  8
DAYS >= .10         0                                  8
DAYS >= .50         0                                  6
DAYS >= 1.00        0                                  1
GREATEST
 24 HR. TOTAL    0.04   12/19 TO 12/19           12/14 TO 12/15
                        12/02 TO 12/02                    12/31 TO 12/31
                                                          12/31 TO 12/31

DEGREE_DAYS
HEATING TOTAL     564                                587
 SINCE 7/1       1013                               1080
COOLING TOTAL       0                                  0
 SINCE 1/1        635                                356
..................................................

WIND (MPH)
AVERAGE WIND SPEED              2.7
RESULTANT WIND SPEED/DIRECTION   1/329
HIGHEST WIND SPEED/DIRECTION    25/020    DATE  12/04
HIGHEST GUST SPEED/DIRECTION    35/010    DATE  12/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.30
NUMBER OF DAYS FAIR           21
NUMBER OF DAYS PC             10
NUMBER OF DAYS CLOUDY          0

AVERAGE RH (PERCENT)     72

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                2     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      22     FOG W/VIS <= 1/4 MILE     13
HAZE                      2

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

$$



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