Climatological Report (Monthly)
Issued by NWS

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CXUS56 KSEW 011033
CLMSEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
232 AM PST SUN JAN 1 2017

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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1945 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              66   12/10/2014
 LOW                6   12/30/1968
HIGHEST            50   12/20        MM      MM       60  12/08
                                                          12/03
LOWEST             23   12/17        MM      MM       28  12/31
AVG. MAXIMUM     41.9              45.7    -3.8     47.1
AVG. MINIMUM     34.0              35.6    -1.6     38.9
MEAN             38.0              40.6    -2.6     43.0
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.8    -0.8        0
DAYS MIN <= 32     11               7.7     3.3        3
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        11.85   1979
 MINIMUM         1.37   1978
TOTALS           3.87              5.35   -1.48    11.21
DAILY AVG.       0.12              0.17   -0.05     0.36
DAYS >= .01        20              17.6     2.4       25
DAYS >= .10        11              11.6    -0.6       20
DAYS >= .50         2               3.3    -1.3        9
DAYS >= 1.00        0               0.9    -0.9        3
GREATEST
 24 HR. TOTAL    0.81   12/19 TO 12/19

SNOWFALL (INCHES)
RECORDS
 TOTAL           22.1   1968
TOTALS            1.0               1.7    -0.7        T
SINCE 7/1         1.0               2.9    -1.9        T
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0                                  0
GREATEST
 SNOW DEPTH         1   12/09                          0
 24 HR TOTAL      0.5   12/09 TO 12/09                 T

DEGREE_DAYS
HEATING TOTAL     830               755      75      677
 SINCE 7/1       1681              1938    -257     1688
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        291               189     102      474
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              9.2
HIGHEST WIND SPEED/DIRECTION    30/210    DATE  12/20
HIGHEST GUST SPEED/DIRECTION    42/220    DATE  12/20

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            2
NUMBER OF DAYS PC              8
NUMBER OF DAYS CLOUDY         21

AVERAGE RH (PERCENT)     81

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN               20     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       3
LIGHT SNOW                8     SLEET                      0
FOG                      22     FOG W/VIS <= 1/4 MILE      2
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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