421
CXUS56 KSEW 011132
CLMSEA

CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
332 AM PST THU JAN 01 2026

...................................

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 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
................................................................
TEMPERATURE (F)
RECORD
 HIGH             66   12/10/2014
 LOW               6   12/30/1968
HIGHEST           57   12/10         MM      MM       59  12/20
                       12/15
LOWEST            30   12/28         MM      MM       28  12/03
AVG. MAXIMUM    49.2               47.0     2.2     49.1
AVG. MINIMUM    41.2               37.1     4.1     38.8
MEAN            45.2               42.0     3.2     43.9
DAYS MAX >= 90     0                0.0     0.0       MM
DAYS MAX <= 32     0                0.5    -0.5       MM
DAYS MIN <= 32     2                7.2    -5.2       MM
DAYS MIN <= 0      0                0.0     0.0       MM

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       11.85   1979
 MINIMUM        1.37   1978
TOTALS          7.37               5.72    1.65     5.50
DAILY AVG.      0.25               0.18    0.07     0.18
DAYS >= .01       20               18.4     1.6       MM
DAYS >= .10       14               12.1     1.9       MM
DAYS >= .50        3                3.6    -0.6       MM
DAYS >= 1.00       2                1.0     1.0       MM
GREATEST
 24 HR. TOTAL   1.66   12/09 TO 12/10

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                                  MM
GREATEST
 SNOW DEPTH        0                                   0
 24 HR TOTAL      MM                                  MM

DEGREE DAYS
HEATING TOTAL    606                711    -105      646
 SINCE 7/1      1520               1770    -250       MM
COOLING TOTAL      0                  0       0        0
 SINCE 1/1       328                263      65       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              9.3
HIGHEST WIND SPEED/DIRECTION    37/210    DATE  12/17
HIGHEST GUST SPEED/DIRECTION    53/200    DATE  12/06

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.85
NUMBER OF DAYS FAIR            0
NUMBER OF DAYS PC              8
NUMBER OF DAYS CLOUDY         23

AVERAGE RH (PERCENT)     86

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       8
LIGHT RAIN               24     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      5
HAZE                      1

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

$$