815
CXUS56 KSEW 011039
CLMSEA

CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
339 AM PDT MON SEP 01 2025

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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF AUGUST 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             99   08/09/1981
                       08/09/1960
 LOW              44   08/14/1955
                       08/13/1955
                       08/27/1952
HIGHEST           92   08/12         MM      MM       87  08/01
                                                          08/08
LOWEST            53   08/21         MM      MM       50  08/28
AVG. MAXIMUM    78.4               77.6     0.8     75.7
AVG. MINIMUM    59.3               57.2     2.1     57.3
MEAN            68.8               67.4     1.4     66.5
DAYS MAX >= 90     4                1.2     2.8       MM
DAYS MAX <= 32     0                0.0     0.0       MM
DAYS MIN <= 32     0                0.0     0.0       MM
DAYS MIN <= 0      0                0.0     0.0       MM

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        4.59   1975
 MINIMUM           T   2012
TOTALS          1.14               0.97    0.17     1.66
DAILY AVG.      0.04               0.03    0.01     0.05
DAYS >= .01        3                4.9    -1.9        7
DAYS >= .10        3                2.3     0.7        5
DAYS >= .50        1                0.6     0.4        0
DAYS >= 1.00       0                0.1    -0.1        0
GREATEST
 24 HR. TOTAL   0.81   08/14 TO 08/15

DEGREE DAYS
HEATING TOTAL      3                 24     -21       31
 SINCE 7/1        24                 55     -31       MM
COOLING TOTAL    130                 98      32       83
 SINCE 1/1       294                233      61       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              7.3
HIGHEST WIND SPEED/DIRECTION    25/360    DATE  08/11
HIGHEST GUST SPEED/DIRECTION    30/340    DATE  08/11

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            5
NUMBER OF DAYS PC             16
NUMBER OF DAYS CLOUDY         10

AVERAGE RH (PERCENT)     64

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       2
LIGHT RAIN                5     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       6     FOG W/VIS <= 1/4 MILE      0
HAZE                      0

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

$$