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000
CXUS56 KSEW 011035
CLMSEA

CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
335 AM PDT MON MAY 01 2023

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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF APRIL 2023...

CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1945 TO 2023

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           80   04/28         MM      MM       73  04/07
LOWEST            35   04/02         MM      MM       32  04/13
                       04/03
                       04/04
AVG. MAXIMUM    55.3               59.3    -4.0     54.7
AVG. MINIMUM    41.7               43.3    -1.6     39.4
MEAN            48.5               51.3    -2.8     47.1
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        1
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        6.53   1991
 MINIMUM        0.33   1956
TOTALS          3.86               3.18    0.68     2.71
DAILY AVG.      0.13               0.11    0.02     0.09
DAYS >= .01       18               15.0     3.0       20
DAYS >= .10       10                8.7     1.3       10
DAYS >= .50        2                1.5     0.5        1
DAYS >= 1.00       0                0.3    -0.3        0
GREATEST
 24 HR. TOTAL   0.71   04/10 TO 04/11

SNOWFALL (INCHES)
RECORDS
 TOTAL           2.3   1972
TOTALS             T                0.0     0.0        T
SINCE 7/1        8.1                6.3     1.8       MM
SNOWDEPTH AVG.     0                                   0
DAYS >= 1.0        0                                   0
GREATEST
 SNOW DEPTH        0                                   0
 24 HR TOTAL      MM                                  MM

DEGREE DAYS
HEATING TOTAL    486                412      74      530
 SINCE 7/1      4165               4016     149       MM
COOLING TOTAL      0                  1      -1        0
 SINCE 1/1         0                  1      -1       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              8.4
HIGHEST WIND SPEED/DIRECTION    25/210    DATE  04/01
                                25/210          04/11
                                25/230          04/17
HIGHEST GUST SPEED/DIRECTION    36/220    DATE  04/17

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.77
NUMBER OF DAYS FAIR            2
NUMBER OF DAYS PC             11
NUMBER OF DAYS CLOUDY         17

AVERAGE RH (PERCENT)     70

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     MIXED PRECIP               1
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN               19     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                2     SLEET                      1
FOG                      15     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.

$$