Climatological Report (Monthly) Issued by NWS
000
CXUS56 KSEW 052102
CLMSEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
102 PM PST FRI JAN 05 2024
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...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2023...
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
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TEMPERATURE (F)
RECORD
HIGH 66 12/10/2014
LOW 6 12/30/1968
HIGHEST 63 12/29 MM MM 57 12/26
LOWEST 30 12/24 MM MM 18 12/22
AVG. MAXIMUM 50.6 47.0 3.6 43.2
AVG. MINIMUM 40.4 37.1 3.3 34.4
MEAN 45.5 42.0 3.5 38.8
DAYS MAX >= 90 0 0.0 0.0 0
DAYS MAX <= 32 0 0.5 -0.5 2
DAYS MIN <= 32 1 7.2 -6.2 13
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 11.85 1979
MINIMUM 1.37 1978
TOTALS 8.48 5.72 2.76 7.55
DAILY AVG. 0.27 0.18 0.09 0.25
DAYS >= .01 18 18.4 -0.4 24
DAYS >= .10 15 12.1 2.9 16
DAYS >= .50 6 3.6 2.4 4
DAYS >= 1.00 2 1.0 1.0 2
GREATEST
24 HR. TOTAL 3.00 12/04 TO 12/05
SNOWFALL (INCHES)
RECORDS
TOTAL 22.1 1968
TOTALS 0.0 1.7 -1.7 4.7
SINCE 7/1 0.0 1.9 -1.9 MM
SNOWDEPTH AVG. 0 0
DAYS >= 1.0 0 1
GREATEST
SNOW DEPTH 0 2
24 HR TOTAL 0.0 MM
DEGREE DAYS
HEATING TOTAL 596 711 -115 805
SINCE 7/1 1599 1770 -171 MM
COOLING TOTAL 0 0 0 0
SINCE 1/1 378 263 115 MM
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WIND (MPH)
AVERAGE WIND SPEED 7.2
HIGHEST WIND SPEED/DIRECTION 35/190 DATE 12/02
HIGHEST GUST SPEED/DIRECTION 52/190 DATE 12/02
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.82
NUMBER OF DAYS FAIR 1
NUMBER OF DAYS PC 7
NUMBER OF DAYS CLOUDY 23
AVERAGE RH (PERCENT) 80
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 1 MIXED PRECIP 0
HEAVY RAIN 2 RAIN 9
LIGHT RAIN 21 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 24 FOG W/VIS <= 1/4 MILE 6
HAZE 4
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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