Climatological Report (Monthly)
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000
CXUS56 KSEW 011032
CLMSEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
332 AM PDT MON MAY 1 2017

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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF APRIL 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   04/18/2016
 LOW               29   04/05/1975
                        04/01/1953
                        04/07/1952
HIGHEST            66   04/21        MM      MM       89  04/18
                        04/16
LOWEST             38   04/11        MM      MM       43  04/26
AVG. MAXIMUM     57.3              58.5    -1.2     65.9
AVG. MINIMUM     44.0              42.2     1.8     47.5
MEAN             50.6              50.3     0.3     56.7
DAYS MAX >= 90      0               0.0     0.0        0
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         6.53   1991
 MINIMUM         0.33   1956
TOTALS           4.21              2.71    1.50     1.19
DAILY AVG.       0.14              0.09    0.05     0.04
DAYS >= .01        23              14.3     8.7        9
DAYS >= .10        10               7.5     2.5        6
DAYS >= .50         1               1.3    -0.3        0
DAYS >= 1.00        0               0.2    -0.2        0
GREATEST
 24 HR. TOTAL    0.85   04/12 TO 04/12

SNOWFALL (INCHES)
RECORDS
 TOTAL            2.3   1972
TOTALS            0.0               0.0     0.0      0.0
SINCE 7/1        11.2               6.8     4.4        T
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0                                  0
GREATEST
 SNOW DEPTH         0   MM                             0
 24 HR TOTAL      0.0   04/30 TO 04/30               0.0

DEGREE_DAYS
HEATING TOTAL     424               440     -16      255
 SINCE 7/1       4177              4268     -91     3576
COOLING TOTAL       0                 0       0       14
 SINCE 1/1          0                 0       0       14
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              9.0
HIGHEST WIND SPEED/DIRECTION    38/190    DATE  04/07
HIGHEST GUST SPEED/DIRECTION    47/200    DATE  04/07

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            0
NUMBER OF DAYS PC             12
NUMBER OF DAYS CLOUDY         18

AVERAGE RH (PERCENT)     72

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       7
LIGHT RAIN               26     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      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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