Climatological Report (Monthly)
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000
CXUS56 KSEW 011046
CLMSEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
345 AM PDT FRI SEP 1 2017

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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF AUGUST 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              99   08/09/1981
                        08/09/1960
 LOW               44   08/14/1955
                        08/13/1955
                        08/27/1952
HIGHEST            94   08/03        MM      MM       95  08/19
LOWEST             54   08/26        MM      MM       53  08/29
                        08/25                             08/01
AVG. MAXIMUM     81.5              76.3     5.2     79.5
AVG. MINIMUM     59.0              55.9     3.1     57.9
MEAN             70.3              66.1     4.2     68.7
DAYS MAX >= 90      5               0.8     4.2        6
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.0     0.0        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.59   1975
 MINIMUM            T   2012
TOTALS           0.02              0.88   -0.86     0.17
DAILY AVG.       0.00              0.03   -0.03     0.01
DAYS >= .01         1               4.8    -3.8        3
DAYS >= .10         0               2.3    -2.3        1
DAYS >= .50         0               0.5    -0.5        0
DAYS >= 1.00        0               0.1    -0.1        0
GREATEST
 24 HR. TOTAL    0.02   08/12 TO 08/12

DEGREE_DAYS
HEATING TOTAL       1                36     -35       10
 SINCE 7/1          7                85     -78       21
COOLING TOTAL     168                70      98      133
 SINCE 1/1        317               168     149      288
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              6.8
HIGHEST WIND SPEED/DIRECTION    18/350    DATE  08/21
HIGHEST GUST SPEED/DIRECTION    24/340    DATE  08/21

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.40
NUMBER OF DAYS FAIR           15
NUMBER OF DAYS PC             12
NUMBER OF DAYS CLOUDY          4

AVERAGE RH (PERCENT)     61

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                2     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       6     FOG W/VIS <= 1/4 MILE      0
HAZE                     11

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

$$



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