735  
CDUS46 KSEW 130829  
CLISEA  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SEATTLE  
129 AM PDT FRI SEP 13 2024  
   
...............................  
 
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 12 2024...  
 
CLIMATE NORMAL PERIOD 1991 TO 2020  
CLIMATE RECORD PERIOD 1945 TO 2024  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................  
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 68 353 PM 85 1961 73 -5 69  
1975  
MINIMUM 55 1159 PM 44 1949 54 1 55  
1962  
AVERAGE 62 64 -2 62  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.60 2004 0.05 -0.05 0.05  
MONTH TO DATE 0.24 0.54 -0.30 0.18  
SINCE OCT 1 35.34 38.27 -2.93 29.45  
SINCE JAN 1 18.19 22.33 -4.14 14.56  
 
SNOWFALL (IN)  
YESTERDAY 0.0 MM MM 0.0  
MONTH TO DATE 0.0 0.0  
SINCE OCT 1 0.3 8.1  
SINCE JUL 1 0.0 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 3 2 1 3  
MONTH TO DATE 12 24 -12 18  
SINCE SEP 1 12 24 -12 18  
SINCE JUL 1 48 79 -31 30  
 
COOLING  
YESTERDAY 0 1 -1 0  
MONTH TO DATE 37 21 16 19  
SINCE SEP 1 37 21 16 19  
SINCE JAN 1 310 254 56 371    
...............................................................  
 
WIND (MPH)  
RESULTANT WIND SPEED 4 RESULTANT WIND DIRECTION SW (220)  
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION SW (210)  
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION S (200)  
AVERAGE WIND SPEED 5.3  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 600 AM  
LOWEST 61 400 PM  
AVERAGE 79  
   
......................................................  
 
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 73 87 1999  
MINIMUM TEMPERATURE (F) 54 39 1952  
 
SUNRISE AND SUNSET  
SEPTEMBER 13 2024.....SUNRISE 645 AM PDT SUNSET 724 PM PDT  
SEPTEMBER 14 2024.....SUNRISE 646 AM PDT SUNSET 722 PM PDT  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 
 
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