000
CXUS56 KSEW 011050
CLMSEA

CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
350 AM PDT SUN OCT 01 2023

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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2023...

CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1945 TO 2023

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             98   09/02/1988
 LOW              35   09/27/1972
HIGHEST           87   09/02         MM      MM       92  09/10
LOWEST            46   09/29         MM      MM       49  09/19
AVG. MAXIMUM    70.6               71.6    -1.0     74.6
AVG. MINIMUM    53.4               53.6    -0.2     55.1
MEAN            62.0               62.6    -0.6     64.8
DAYS MAX >= 90     0                0.2    -0.2        1
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        6.17   2013
 MINIMUM           T   1991
TOTALS          3.44               1.61    1.83     0.25
DAILY AVG.      0.11               0.05    0.06     0.01
DAYS >= .01       11                8.3     2.7        4
DAYS >= .10        8                4.2     3.8        1
DAYS >= .50        3                0.9     2.1        0
DAYS >= 1.00       0                0.2    -0.2        0
GREATEST
 24 HR. TOTAL   1.14   09/24 TO 09/25

DEGREE DAYS
HEATING TOTAL    108                102       6       35
 SINCE 7/1       120                158     -38       MM
COOLING TOTAL     26                 30      -4       37
 SINCE 1/1       378                263     115       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              6.9
HIGHEST WIND SPEED/DIRECTION    22/220    DATE  09/27
HIGHEST GUST SPEED/DIRECTION    32/210    DATE  09/25

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.59
NUMBER OF DAYS FAIR            6
NUMBER OF DAYS PC             13
NUMBER OF DAYS CLOUDY         11

AVERAGE RH (PERCENT)     68

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       5
LIGHT RAIN               12     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      15     FOG W/VIS <= 1/4 MILE      1
HAZE                      4

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

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