917  
CDUS46 KSEW 180117  
CLISEA  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SEATTLE  
617 PM PDT SUN OCT 17 2021  
   
...............................
 
 
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR OCTOBER 17 2021...  
VALID TODAY AS OF 0500 PM LOCAL TIME.  
 
CLIMATE NORMAL PERIOD 1991 TO 2020  
CLIMATE RECORD PERIOD 1945 TO 2021  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
TODAY  
MAXIMUM 56 153 PM 74 1989 60 -4 57  
MINIMUM 52 459 PM 34 1949 47 5 51  
AVERAGE 54 53 1 54  
 
PRECIPITATION (IN)  
TODAY 0.00 1.24 2009 0.13 -0.13 0.03  
MONTH TO DATE 1.17 1.75 -0.58 2.29  
SINCE OCT 1 1.17 1.75 -0.58 2.29  
SINCE JAN 1 24.40 25.15 -0.75 28.80  
 
SNOWFALL (IN)  
TODAY 0.0 MM MM 0.0  
MONTH TO DATE 0.0 0.0  
SINCE OCT 1 0.0 0.0  
SINCE JUL 1 0.0 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 11 12 -1 11  
MONTH TO DATE 217 157 60 109  
SINCE SEP 1 328 259 69 159  
SINCE JUL 1 367 314 53 194  
 
COOLING  
TODAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE SEP 1 23 30 -7 71  
SINCE JAN 1 377 263 114 332    
...............................................................
 
 
WIND (MPH)  
RESULTANT WIND SPEED 5 RESULTANT WIND DIRECTION S (170)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION SE (150)  
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION SE (150)  
AVERAGE WIND SPEED 6.6  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
FOG  
HAZE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 86 300 PM  
LOWEST 72 200 AM  
AVERAGE 79  
   
......................................................
 
 
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 60 70 1974  
MINIMUM TEMPERATURE (F) 47 32 1949  
 
SUNRISE AND SUNSET  
OCTOBER 17 2021.......SUNRISE 731 AM PDT SUNSET 617 PM PDT  
OCTOBER 18 2021.......SUNRISE 733 AM PDT SUNSET 615 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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