Climatological Report (Monthly)
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000
CXUS56 KSEW 011039
CLMSEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
238 AM PST FRI DEC 1 2017

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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF NOVEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1945 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              74   11/03/2010
                        11/04/1949
 LOW                6   11/15/1955
HIGHEST            68   11/22        MM      MM       70  11/08
LOWEST             33   11/05        MM      MM       39  11/18
                        11/03
AVG. MAXIMUM     51.3              50.9     0.4     56.0
AVG. MINIMUM     42.0              40.0     2.0     45.7
MEAN             46.7              45.4     1.3     50.9
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.3    -0.3        0
DAYS MIN <= 32      0               2.6    -2.6        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        15.63   2006
 MINIMUM         0.74   1996
TOTALS           8.63              6.57    2.06     6.48
DAILY AVG.       0.29              0.22    0.07     0.22
DAYS >= .01        24              18.4     5.6       22
DAYS >= .10        19              13.2     5.8       16
DAYS >= .50         8               4.1     3.9        3
DAYS >= 1.00        1               1.2    -0.2        2
GREATEST
 24 HR. TOTAL    1.14   11/21 TO 11/21

SNOWFALL (INCHES)
RECORDS
 TOTAL           17.5   1985
TOTALS            0.4               1.2    -0.8      0.0
SINCE 7/1         0.4               1.2    -0.8      0.0
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0                                  0
GREATEST
 SNOW DEPTH         T   11/05                          0
 24 HR TOTAL      0.4   11/05 TO 11/05               0.0

DEGREE_DAYS
HEATING TOTAL     545               586     -41      415
 SINCE 7/1        989              1183    -194      851
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        392               189     203      291
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              9.6
HIGHEST WIND SPEED/DIRECTION    39/190    DATE  11/13
HIGHEST GUST SPEED/DIRECTION    54/180    DATE  11/13

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.90
NUMBER OF DAYS FAIR            0
NUMBER OF DAYS PC              5
NUMBER OF DAYS CLOUDY         25

AVERAGE RH (PERCENT)     78

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                3     RAIN                      11
LIGHT RAIN               25     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       1
LIGHT SNOW                2     SLEET                      0
FOG                      23     FOG W/VIS <= 1/4 MILE      1
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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