Climatological Report (Monthly) Issued by NWS
000
CXUS56 KSEW 011035
CLMSEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
335 AM PDT MON MAY 01 2023
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...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
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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
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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.
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