311
CXUS56 KSEW 291857 AAA
CLMSEA
CLIMATE REPORT...CORRECTED
NATIONAL WEATHER SERVICE SEATTLE
1057 AM PST WED JAN 29 2025
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 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 66 12/10/2014
LOW 6 12/30/1968
HIGHEST 59 12/20 MM MM 63 12/29
LOWEST 28 12/03 MM MM 30 12/24
AVG. MAXIMUM 49.1 47.0 2.1 50.6
AVG. MINIMUM 38.8 37.1 1.7 40.4
MEAN 43.9 42.0 1.9 45.5
DAYS MAX >= 90 0 0.0 0.0 0
DAYS MAX <= 32 0 0.5 -0.5 0
DAYS MIN <= 32 5 7.2 -2.2 1
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 11.85 1979
MINIMUM 1.37 1978
TOTALS 5.50 5.72 -0.22 8.48
DAILY AVG. 0.18 0.18 -0.00 0.27
DAYS >= .01 19 18.4 -0.4 18
DAYS >= .10 14 12.1 1.9 15
DAYS >= .50 5 3.6 1.4 6
DAYS >= 1.00 0 1.0 -1.0 2
GREATEST
24 HR. TOTAL 1.20 12/17 TO 12/18
SNOWFALL (INCHES)
RECORDS
TOTAL 22.1 1968
TOTALS 0.0 1.7 -1.7 0.0
SINCE 7/1 0.0 1.9 -1.9 MM
SNOWDEPTH AVG. 0 0
DAYS >= 1.0 0 0
GREATEST
SNOW DEPTH 0 0
24 HR TOTAL MM 0.0
DEGREE DAYS
HEATING TOTAL 646 711 -65 596
SINCE 7/1 1687 1770 -83 MM
COOLING TOTAL 0 0 0 0
SINCE 1/1 315 263 52 MM
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WIND (MPH)
AVERAGE WIND SPEED 8.4
HIGHEST WIND SPEED/DIRECTION 36/190 DATE 12/14
HIGHEST GUST SPEED/DIRECTION 56/220 DATE 12/18
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.81
NUMBER OF DAYS FAIR 0
NUMBER OF DAYS PC 9
NUMBER OF DAYS CLOUDY 21
AVERAGE RH (PERCENT) 81
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 0 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 5
LIGHT RAIN 22 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 25 FOG W/VIS <= 1/4 MILE 5
HAZE 1
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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