594
CXUS56 KSEW 011043
CLMSEA

CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
343 AM PDT MON JUN 01 2026

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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF MAY 2026...

CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1945 TO 2026

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             93   05/21/1963
 LOW              28   05/01/1954
HIGHEST           82   05/12         MM      MM       81  05/28
                       05/28
LOWEST            41   05/17         MM      MM       42  05/04
                                                          05/05
AVG. MAXIMUM    67.4               66.3     1.1     66.4
AVG. MINIMUM    49.4               48.7     0.7     47.6
MEAN            58.4               57.5     0.9     57.0
DAYS MAX >= 90     0                0.0     0.0        0
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     0                0.0     0.0        0
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        4.76   1948
 MINIMUM        0.12   2018
TOTALS          1.14               1.88   -0.74     0.83
DAILY AVG.      0.04               0.06   -0.02     0.03
DAYS >= .01        8               11.3    -3.3       10
DAYS >= .10        5                5.8    -0.8        4
DAYS >= .50        0                0.9    -0.9        0
DAYS >= 1.00       0                0.1    -0.1        0
GREATEST
 24 HR. TOTAL   0.38   05/29 TO 05/29

DEGREE DAYS
HEATING TOTAL    209                242     -33      243
 SINCE 7/1      3915               4258    -343       MM
COOLING TOTAL     10                  9       1        3
 SINCE 1/1        10                 10       0       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              7.3
HIGHEST WIND SPEED/DIRECTION    28/210    DATE  05/13
HIGHEST GUST SPEED/DIRECTION    43/220    DATE  05/13

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.65
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC             14
NUMBER OF DAYS CLOUDY         13

AVERAGE RH (PERCENT)     67

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN               11     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       8     FOG W/VIS <= 1/4 MILE      0
HAZE                      1

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

$$