369  
CDUS46 KSEW 210846  
CLISEA  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SEATTLE WA  
1246 AM PST TUE NOV 21 2017  
 
   
...............................
 
 
 
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR NOVEMBER 20 2017...  
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1945 TO 2017  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 50 322 PM 64 1987 50 0 57  
MINIMUM 41 1043 PM 24 1946 39 2 47  
AVERAGE 46 44 2 52  
 
PRECIPITATION (IN)  
YESTERDAY 0.63 3.41 1959 0.23 0.40 0.01  
MONTH TO DATE 5.37 4.35 1.02 4.37  
SINCE OCT 1 10.17 7.83 2.34 14.42  
SINCE JAN 1 39.18 29.92 9.26 39.20  
 
SNOWFALL (IN)  
YESTERDAY 0.0 5.2 1960 0.0  
MONTH TO DATE 0.4 0.0  
SINCE OCT 1 0.4 0.0  
SINCE JUL 1 0.4 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 19 21 -2 13  
MONTH TO DATE 387 369 18 233  
SINCE SEP 1 824 881 -57 648  
SINCE JUL 1 831 966 -135 669  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE SEP 1 75 21 54 3  
SINCE JAN 1 392 189 203 291    
..............................................................
 
 
WIND (MPH)  
RESULTANT WIND SPEED 2 RESULTANT WIND DIRECTION SE (140)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION SW (220)  
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION SW (230)  
AVERAGE WIND SPEED 6.3  
 
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 200 AM  
LOWEST 65 600 PM  
AVERAGE 79  
   
......................................................
 
 
 
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 50 62 1954  
MINIMUM TEMPERATURE (F) 39 21 1985  
1977  
 
 
SUNRISE AND SUNSET  
NOVEMBER 21 2017......SUNRISE 723 AM PST SUNSET 427 PM PST  
NOVEMBER 22 2017......SUNRISE 724 AM PST SUNSET 426 PM PST  
 
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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