Climatological Report (Daily)
Issued by NWS

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CDUS46 KMTR 180831
CLIAPC


CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
1231 AM PST MON DEC 18 2017


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

...THE NAPA AIRPORT  CLIMATE SUMMARY FOR DECEMBER 17 2017...

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


WEATHER ITEM   OBSERVED TIME   RECORD YEAR NORMAL DEPARTURE LAST
                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
                                                  NORMAL
..................................................................
TEMPERATURE (F)
 YESTERDAY
  MAXIMUM         66R   249 PM  66    2000  55     11       51
  MINIMUM         37   1146 PM  24    2008  36      1       30
  AVERAGE         52                        45      7       41

PRECIPITATION (IN)
  YESTERDAY        0.00                                      0.00
  MONTH TO DATE    0.01                                      3.54
  SINCE OCT 1      2.98                                      8.29
  SINCE JAN 1     31.16                                     22.96

DEGREE DAYS
 HEATING
  YESTERDAY       13                                        24
  MONTH TO DATE  278                                       261
  SINCE DEC 1    278                                       261
  SINCE JUL 1    806                                       765

 COOLING
  YESTERDAY        0                                         0
  MONTH TO DATE    0                                         0
  SINCE DEC 1      0                                         0
  SINCE JAN 1    530                                       186
..................................................................


WIND (MPH)
  RESULTANT WIND SPEED   2   RESULTANT WIND DIRECTION   N (0)
  HIGHEST WIND SPEED    33   HIGHEST WIND DIRECTION     N (10)
  HIGHEST GUST SPEED    43   HIGHEST GUST DIRECTION     N (360)
  AVERAGE WIND SPEED     8.2


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.0


WEATHER CONDITIONS
 THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
  NO SIGNIFICANT WEATHER WAS OBSERVED.


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    76          1100 PM
 LOWEST     19           200 AM
 AVERAGE    48

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


THE NAPA AIRPORT  CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   55        62      2003
 MINIMUM TEMPERATURE (F)   36        21      2006


SUNRISE AND SUNSET
DECEMBER 18 2017......SUNRISE   721 AM PST   SUNSET   451 PM PST
DECEMBER 19 2017......SUNRISE   721 AM PST   SUNSET   452 PM PST


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




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