Climatological Report (Monthly)
Issued by NWS

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CXUS56 KMTR 012302
CLMAPC


CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
302 PM PST THU JAN 1 2015

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

...THE NAPA AIRPORT  CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2014...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2014

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              78   MM
 LOW               16   12/05/2013
HIGHEST            65   12/23                         68  12/01
                        12/21
                        12/08
LOWEST             29   12/27                         16  12/05
AVG. MAXIMUM     59.4                               59.0
AVG. MINIMUM     44.3                               27.6
MEAN             51.8                               43.3
DAYS MAX >= 90      0                                  0
DAYS MAX <= 32      0                                  0
DAYS MIN <= 32      2                                 26
DAYS MIN <= 0       0                                  0

PRECIPITATION (INCHES)
TOTALS          10.14              3.79    6.35     0.47
DAILY AVG.       0.33                               0.02
DAYS >= .01        13                                  1
DAYS >= .10        13                                  1
DAYS >= .50         7                                  0
DAYS >= 1.00        4                                  0
GREATEST
 24 HR. TOTAL    3.24   12/11 TO 12/12           12/05 TO 12/06
                                                          12/31 TO 12/31
                                                          12/31 TO 12/31

DEGREE_DAYS
HEATING TOTAL     401                                666
 SINCE 7/1        874                               1345
COOLING TOTAL       0                                  0
 SINCE 1/1        267                                303
..................................................

WIND (MPH)
AVERAGE WIND SPEED              7.3
RESULTANT WIND SPEED/DIRECTION   3/068
HIGHEST WIND SPEED/DIRECTION    39/020    DATE  12/30
HIGHEST GUST SPEED/DIRECTION    51/020    DATE  12/30

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            7
NUMBER OF DAYS PC             13
NUMBER OF DAYS CLOUDY         11

AVERAGE RH (PERCENT)     84

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                7     RAIN                      12
LIGHT RAIN               16     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      25     FOG W/VIS <= 1/4 MILE      9
HAZE                      0

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

$$


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