Climatological Report (Monthly)
Issued by NWS

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CXUS56 KSEW 011032
CLMSEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
332 AM PDT WED NOV 1 2017

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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 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              89   10/01/1987
 LOW               28   10/19/1949
HIGHEST            69   10/05        MM      MM       67  10/28
                        10/03
LOWEST             38   10/31        MM      MM       43  10/12
                        10/14                             10/11
AVG. MAXIMUM     61.1              59.7     1.4     60.5
AVG. MINIMUM     45.3              45.8    -0.5     49.1
MEAN             53.2              52.8     0.4     54.8
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.1    -0.1        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        10.05   2016
 MINIMUM         0.31   1987
TOTALS           4.80              3.48    1.32    10.05
DAILY AVG.       0.15              0.11    0.04     0.32
DAYS >= .01        12              13.1    -1.1       25
DAYS >= .10         6               7.8    -1.8       17
DAYS >= .50         3               2.0     1.0        8
DAYS >= 1.00        3               0.5     2.5        4
GREATEST
 24 HR. TOTAL    1.61   10/21 TO 10/21

SNOWFALL (INCHES)
RECORDS
 TOTAL             MM   MM
TOTALS            0.0               0.0     0.0      0.0
SINCE 7/1         0.0               0.0     0.0      0.0
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0                                  0
GREATEST
 SNOW DEPTH         0   MM                             0
 24 HR TOTAL      0.0   10/31 TO 10/31               0.0

DEGREE_DAYS
HEATING TOTAL     359               380     -21      307
 SINCE 7/1        444               597    -153      437
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        392               189     203      291
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              8.0
HIGHEST WIND SPEED/DIRECTION    35/190    DATE  10/18
HIGHEST GUST SPEED/DIRECTION    50/190    DATE  10/18

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR            8
NUMBER OF DAYS PC             16
NUMBER OF DAYS CLOUDY          7

AVERAGE RH (PERCENT)     74

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       6
LIGHT RAIN               14     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      16     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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