Climatological Report (Monthly)
Issued by NWS

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595
CXUS56 KSEW 011044
CLMSEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
243 AM PST THU FEB 1 2018

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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF JANUARY 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1945 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              64   01/15/2018
                        01/20/1981
                        08/09/1981
 LOW                0   01/31/1950
HIGHEST            64R  01/15        MM      MM       54  01/27
                                                          01/21
LOWEST             31   01/01        MM      MM       20  01/06
AVG. MAXIMUM     49.7              47.2     2.5     43.7
AVG. MINIMUM     40.3              36.9     3.4     32.0
MEAN             45.0              42.0     3.0     37.9
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.4    -0.4        0
DAYS MIN <= 32      1               6.4    -5.4       15
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        12.92   1953
 MINIMUM         0.58   1985
TOTALS           8.12              5.57    2.55     4.22
DAILY AVG.       0.26              0.18    0.08     0.14
DAYS >= .01        25              18.2     6.8       11
DAYS >= .10        20              12.1     7.9        4
DAYS >= .50         5               3.7     1.3        2
DAYS >= 1.00        2               0.8     1.2        2
GREATEST
 24 HR. TOTAL    1.12   01/11 TO 01/11

SNOWFALL (INCHES)
RECORDS
 TOTAL           57.2   1950
TOTALS            0.0               1.4    -1.4      3.0
SINCE 7/1         3.0               4.3    -1.3      4.0
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0                                  1
GREATEST
 SNOW DEPTH         0   MM                             2
 24 HR TOTAL      0.0   01/31 TO 01/31               3.0

DEGREE_DAYS
HEATING TOTAL     615               711     -96      836
 SINCE 7/1       2373              2649    -276     2517
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0        0
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              9.7
HIGHEST WIND SPEED/DIRECTION    31/220    DATE  01/27
HIGHEST GUST SPEED/DIRECTION    41/220    DATE  01/27

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            1
NUMBER OF DAYS PC              3
NUMBER OF DAYS CLOUDY         27

AVERAGE RH (PERCENT)     81

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                      10
LIGHT RAIN               26     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      26     FOG W/VIS <= 1/4 MILE      0
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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