Climatological Report (Monthly)
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
000
CXUS56 KSEW 052102
CLMSEA

CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
102 PM PST FRI JAN 05 2024

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

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

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.

$$


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.