Climatological Report (Monthly)
Issued by NWS Seattle/Tacoma, WA

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CXUS56 KSEW 011032
CLMSEW


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
231 AM PST MON JAN 1 2018

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

...THE SEATTLE WA WFO CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1986 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              65   12/10/2014
 LOW               10   12/21/1990
HIGHEST            55   12/07        MM      MM       51  12/20
LOWEST             28   12/21        MM      MM       24  12/17
                        12/08
AVG. MAXIMUM     46.0              45.9     0.1     42.4
AVG. MINIMUM     35.1              36.3    -1.2     34.7
MEAN             40.5              41.1    -0.6     38.5
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.6    -0.6        0
DAYS MIN <= 32     11               6.4     4.6        9
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        10.85   1996
 MINIMUM         1.49   2011
TOTALS           4.83              5.43   -0.60     3.71
DAILY AVG.       0.16              0.18   -0.02     0.12
DAYS >= .01        15              18.8    -3.8       20
DAYS >= .10         9              11.8    -2.8       12
DAYS >= .50         4               3.2     0.8        2
DAYS >= 1.00        2               1.1     0.9        0

SNOWFALL (INCHES)
TOTALS            3.2                                1.4
SINCE 7/1         3.2                                1.4
SNOWDEPTH AVG.      0                                  0
GREATEST
 SNOW DEPTH         2                                  0  MM

DEGREE_DAYS
HEATING TOTAL     751               741      10      812
 SINCE 7/1       1726              1853    -127     1623
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        345               176     169      260
.................................................................

WIND (MPH)
HIGHEST GUST SPEED/DIRECTION    MM        DATE   MM


WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       4
LIGHT RAIN               15     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                2     SLEET                      0
FOG                      11     FOG W/VIS <= 1/4 MILE      4
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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