906
CXUS56 KSEW 011031
CLMSEA

CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
331 AM PDT THU MAY 01 2025

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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF APRIL 2025...

CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1945 TO 2025

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           72   04/24         MM      MM       72  04/20
LOWEST            37   04/13         MM      MM       36  04/17
AVG. MAXIMUM    60.8               59.3     1.5     57.7
AVG. MINIMUM    43.4               43.3     0.1     42.7
MEAN            52.1               51.3     0.8     50.2
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        6.53   1991
 MINIMUM        0.33   1956
TOTALS          2.55               3.18   -0.63     0.89
DAILY AVG.      0.09               0.11   -0.02     0.03
DAYS >= .01       11               15.0    -4.0       12
DAYS >= .10        6                8.7    -2.7        2
DAYS >= .50        1                1.5    -0.5        0
DAYS >= 1.00       0                0.3    -0.3        0
GREATEST
 24 HR. TOTAL   0.79   04/06 TO 04/07

SNOWFALL (INCHES)
RECORDS
 TOTAL           2.3   1972
TOTALS           0.0                0.0     0.0      0.0
SINCE 7/1        2.3                6.3    -4.0       MM
SNOWDEPTH AVG.     0                                   0
DAYS >= 1.0        0                                   0
GREATEST
 SNOW DEPTH        0                                   0
 24 HR TOTAL      MM                                  MM

DEGREE DAYS
HEATING TOTAL    381                412     -31      420
 SINCE 7/1      4084               4016      68       MM
COOLING TOTAL      0                  1      -1        0
 SINCE 1/1         0                  1      -1       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              7.6
HIGHEST WIND SPEED/DIRECTION    30/180    DATE  04/08
HIGHEST GUST SPEED/DIRECTION    42/230    DATE  04/10

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.61
NUMBER OF DAYS FAIR            6
NUMBER OF DAYS PC             13
NUMBER OF DAYS CLOUDY         11

AVERAGE RH (PERCENT)     65

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       3
LIGHT RAIN               12     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       9     FOG W/VIS <= 1/4 MILE      0
HAZE                      2

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

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