Climatological Report (Monthly)
Issued by NWS

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000
CXUS56 KSEW 011030
CLMSEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
230 AM PST THU JAN 1 2015

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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2014...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1945 TO 2014

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            66R  12/10        MM      MM       56  12/01
LOWEST             26   12/02        MM      MM       19  12/07
                        12/01
AVG. MAXIMUM     50.3              45.7     4.6     44.6
AVG. MINIMUM     40.3              35.6     4.7     34.8
MEAN             45.3              40.6     4.7     39.7
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.8    -0.8        1
DAYS MIN <= 32      5               7.7    -2.7       11
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        11.85   1979
 MINIMUM         1.37   1978
TOTALS           4.79              5.35   -0.56     1.66
DAILY AVG.       0.15              0.17   -0.02     0.05
DAYS >= .01        15              17.6    -2.6       14
DAYS >= .10        14              11.6     2.4        6
DAYS >= .50         4               3.3     0.7        0
DAYS >= 1.00        0               0.9    -0.9        0
GREATEST
 24 HR. TOTAL    1.02   12/23 TO 12/24

SNOWFALL (INCHES)
RECORDS
 TOTAL           22.1   1968
TOTALS            0.0               1.7    -1.7      1.1
SINCE 7/1         0.8               2.9    -2.1      1.1
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0                                  1
GREATEST
 SNOW DEPTH         0   MM                             0
 24 HR TOTAL      0.0   12/31 TO 12/31               1.1

DEGREE_DAYS
HEATING TOTAL     603               755    -152      778
 SINCE 7/1       1443              1938    -495     1800
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        369               189     180      385
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              8.0
HIGHEST WIND SPEED/DIRECTION    36/190    DATE  12/11
HIGHEST GUST SPEED/DIRECTION    49/180    DATE  12/11

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC              7
NUMBER OF DAYS CLOUDY         20

AVERAGE RH (PERCENT)     73

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       7
LIGHT RAIN               18     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      20     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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