950  
CDUS46 KSEW 170827  
CLISEA  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SEATTLE WA  
1227 AM PST MON FEB 17 2020  
 
   
...............................
 
 
 
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR FEBRUARY 16 2020...  
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1945 TO 2020  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 48 141 PM 59 2015 50 -2 44  
MINIMUM 38 1159 PM 13 1956 37 1 36  
AVERAGE 43 43 0 40  
 
PRECIPITATION (IN)  
YESTERDAY T 1.83 1949 0.12 -0.12 0.15  
MONTH TO DATE 3.54 2.06 1.48 4.08  
SINCE OCT 1 26.11 23.03 3.08 23.19  
SINCE JAN 1 12.77 7.63 5.14 7.91  
 
SNOWFALL (IN)  
YESTERDAY MM 3.5 1990 0.0  
MONTH TO DATE T 20.2  
SINCE OCT 1 0.7 20.2  
SINCE JUL 1 0.7 20.2  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 22 22 0 25  
MONTH TO DATE 345 352 -7 477  
SINCE DEC 1 1588 1818 -230 1726  
SINCE JUL 1 2665 3001 -336 2669  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 0 0 0 0    
..............................................................
 
 
WIND (MPH)  
RESULTANT WIND SPEED 9 RESULTANT WIND DIRECTION S (200)  
HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION SW (210)  
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION SW (230)  
AVERAGE WIND SPEED 9.7  
 
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
HAZE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 600 AM  
LOWEST 65 100 PM  
AVERAGE 79  
   
......................................................
 
 
 
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 50 63 2016  
MINIMUM TEMPERATURE (F) 37 23 1993  
1990  
 
 
SUNRISE AND SUNSET  
FEBRUARY 17 2020......SUNRISE 712 AM PST SUNSET 535 PM PST  
FEBRUARY 18 2020......SUNRISE 710 AM PST SUNSET 537 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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