Climatological Report (Monthly)
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000
CXUS56 KSEW 011041
CLMSEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
240 AM PST WED FEB 1 2017

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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF JANUARY 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              64   01/20/1981
 LOW                0   01/31/1950
HIGHEST            54   01/27        MM      MM       58  01/27
                        01/21
LOWEST             20   01/06        MM      MM       25  01/02
AVG. MAXIMUM     43.7              47.2    -3.5     49.1
AVG. MINIMUM     32.0              36.9    -4.9     38.4
MEAN             37.9              42.0    -4.1     43.7
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.4    -0.4        0
DAYS MIN <= 32     15               6.4     8.6        4
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        12.92   1953
 MINIMUM         0.58   1985
TOTALS           4.22              5.57   -1.35     7.45
DAILY AVG.       0.14              0.18   -0.04     0.24
DAYS >= .01        11              18.2    -7.2       20
DAYS >= .10         4              12.1    -8.1       16
DAYS >= .50         2               3.7    -1.7        6
DAYS >= 1.00        2               0.8     1.2        1
GREATEST
 24 HR. TOTAL    2.60   01/17 TO 01/18

SNOWFALL (INCHES)
RECORDS
 TOTAL           57.2   1950
TOTALS            3.0               1.4     1.6        T
SINCE 7/1         4.0               4.3    -0.3        T
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         1                                  0
GREATEST
 SNOW DEPTH         2   01/03                          0
                        01/02
                        01/01
 24 HR TOTAL      3.0   01/01 TO 01/01                 T

DEGREE_DAYS
HEATING TOTAL     836               711     125      654
 SINCE 7/1       2517              2649    -132     2342
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0        0
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              7.7
HIGHEST WIND SPEED/DIRECTION    28/180    DATE  01/18
HIGHEST GUST SPEED/DIRECTION    37/090    DATE  01/08

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC             13
NUMBER OF DAYS CLOUDY         14

AVERAGE RH (PERCENT)     72

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

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

$$



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