911
CXUS56 KSEW 011051
CLMSEA

CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
351 AM PDT WED MAY 01 2024

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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF APRIL 2024...

CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1945 TO 2024

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   04/20         MM      MM       80  04/28
LOWEST            36   04/17         MM      MM       35  04/02
                                                          04/03
                                                          04/04
AVG. MAXIMUM    57.7               59.3    -1.6     55.3
AVG. MINIMUM    42.7               43.3    -0.6     41.7
MEAN            50.2               51.3    -1.1     48.5
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          0.89               3.18   -2.29     3.86
DAILY AVG.      0.03               0.11   -0.08     0.13
DAYS >= .01       12               15.0    -3.0       18
DAYS >= .10        2                8.7    -6.7       10
DAYS >= .50        0                1.5    -1.5        2
DAYS >= 1.00       0                0.3    -0.3        0
GREATEST
 24 HR. TOTAL   0.50   04/25 TO 04/26

SNOWFALL (INCHES)
RECORDS
 TOTAL           2.3   1972
TOTALS           0.0                0.0     0.0        T
SINCE 7/1        0.3                6.3    -6.0       MM
SNOWDEPTH AVG.     0                                   0
DAYS >= 1.0        0                                   0
GREATEST
 SNOW DEPTH        0                                   0
 24 HR TOTAL      MM                                  MM

DEGREE DAYS
HEATING TOTAL    420                412       8      486
 SINCE 7/1      3859               4016    -157       MM
COOLING TOTAL      0                  1      -1        0
 SINCE 1/1         0                  1      -1       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              9.1
HIGHEST WIND SPEED/DIRECTION    25/250    DATE  04/20
HIGHEST GUST SPEED/DIRECTION    36/270    DATE  04/20

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.68
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC             14
NUMBER OF DAYS CLOUDY         12

AVERAGE RH (PERCENT)     65

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN               20     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      0
HAZE                      3

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

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