382
CXUS56 KSEW 011137
CLMSEA

CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
337 AM PST WED JAN 01 2025

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...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    49.2               47.0     2.2     50.6
AVG. MINIMUM    38.9               37.1     1.8     40.4
MEAN            44.1               42.0     2.1     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          5.49               5.72   -0.23     8.48
DAILY AVG.      0.18               0.18   -0.00     0.27
DAYS >= .01       18               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    621                711     -90      596
 SINCE 7/1      1662               1770    -108       MM
COOLING TOTAL      0                  0       0        0
 SINCE 1/1       315                263      52       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              8.5
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               21     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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