Climatological Report (Monthly)
Issued by NWS
Issued by NWS
213
CXUS56 KSEW 011032
CLMSEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
332 AM PDT SUN JUN 01 2025
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...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF MAY 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
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TEMPERATURE (F)
RECORD
HIGH 93 05/21/1963
LOW 28 05/01/1954
HIGHEST 81 05/28 MM MM 84 05/10
LOWEST 42 05/04 MM MM 40 05/01
05/05
AVG. MAXIMUM 66.4 66.3 0.1 64.0
AVG. MINIMUM 47.6 48.7 -1.1 47.2
MEAN 57.0 57.5 -0.5 55.6
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 4.76 1948
MINIMUM 0.12 2018
TOTALS 0.83 1.88 -1.05 1.54
DAILY AVG. 0.03 0.06 -0.03 0.05
DAYS >= .01 10 11.3 -1.3 12
DAYS >= .10 4 5.8 -1.8 6
DAYS >= .50 0 0.9 -0.9 1
DAYS >= 1.00 0 0.1 -0.1 0
GREATEST
24 HR. TOTAL 0.24 05/19 TO 05/19
DEGREE DAYS
HEATING TOTAL 243 242 1 292
SINCE 7/1 4327 4258 69 MM
COOLING TOTAL 3 9 -6 7
SINCE 1/1 3 10 -7 MM
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WIND (MPH)
AVERAGE WIND SPEED 8.1
HIGHEST WIND SPEED/DIRECTION 25/220 DATE 05/19
HIGHEST GUST SPEED/DIRECTION 37/200 DATE 05/19
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.64
NUMBER OF DAYS FAIR 4
NUMBER OF DAYS PC 13
NUMBER OF DAYS CLOUDY 12
AVERAGE RH (PERCENT) 63
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 0 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 0
LIGHT RAIN 16 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 0
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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