Climatological Report (Monthly)
Issued by NWS

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CXUS56 KMTR 012355
CLMAPC


CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
355 PM PST TUE JAN 1 2019

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

...THE NAPA AIRPORT  CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2018

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            64   12/25                         68  12/07
                        12/12
LOWEST             30   12/30                         25  12/22
AVG. MAXIMUM     59.1                               61.4
AVG. MINIMUM     38.9                               32.6
MEAN             49.0                               47.0
DAYS MAX >= 90      0                                  0
DAYS MAX <= 32      0                                  0
DAYS MIN <= 32      2                                 16
DAYS MIN <= 0       0                                  0

PRECIPITATION (INCHES)
TOTALS           1.94              3.79   -1.85     0.06
DAILY AVG.       0.06                               0.00
DAYS >= .01         9                                  2
DAYS >= .10         6                                  0
DAYS >= .50         1                                  0
DAYS >= 1.00        0                                  0
GREATEST
 24 HR. TOTAL    0.57   12/16 TO 12/16           12/20 TO 12/20
                                                          12/31 TO 12/31EATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                                                          12/31 TO 12/31EATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S

DEGREE_DAYS
HEATING TOTAL     486                                548
 SINCE 7/1       1053                               1076
COOLING TOTAL       0                                  0
 SINCE 1/1        182                                530
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              5.7
RESULTANT WIND SPEED/DIRECTION   2/050
HIGHEST WIND SPEED/DIRECTION    35/010    DATE  12/31
HIGHEST GUST SPEED/DIRECTION    40/020    DATE  12/31

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.40
NUMBER OF DAYS FAIR           15
NUMBER OF DAYS PC              9
NUMBER OF DAYS CLOUDY          7

AVERAGE RH (PERCENT)     75

WEATHER CONDITIONS. NUMBER OF DAYS WITH
  0
  4
  0
  0
  0
  0
 11
HAZE                      6

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

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