602  
CDUS46 KSEW 140834  
CLISEA  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SEATTLE WA  
133 AM PDT TUE AUG 14 2018  
 
   
...............................
 
 
 
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR AUGUST 13 2018...  
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1945 TO 2018  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 79 337 PM 92 2002 77 2 74  
MINIMUM 59 626 AM 44 1955 56 3 60  
AVERAGE 69 66 3 67  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.85 2014 0.03 -0.03 T  
MONTH TO DATE 0.08 0.28 -0.20 0.02  
SINCE OCT 1 38.15 35.39 2.76 48.82  
SINCE JAN 1 19.29 19.99 -0.70 28.42  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 1 -1 0  
MONTH TO DATE 1 13 -12 0  
SINCE JUN 1 112 206 -94 105  
SINCE JUL 1 10 62 -52 6  
 
COOLING  
YESTERDAY 4 3 1 2  
MONTH TO DATE 77 39 38 104  
SINCE JUN 1 306 131 175 234  
SINCE JAN 1 323 137 186 253    
..............................................................
 
 
WIND (MPH)  
RESULTANT WIND SPEED 7 RESULTANT WIND DIRECTION N (20)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION NE (30)  
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION NE (30)  
AVERAGE WIND SPEED 8.9  
 
 
SKY COVER  
AVERAGE SKY COVER 0.3  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HAZE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 80 400 AM  
LOWEST 48 300 PM  
AVERAGE 64  
   
......................................................
 
 
 
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 77 95 2010  
MINIMUM TEMPERATURE (F) 56 44 1955  
 
 
SUNRISE AND SUNSET  
AUGUST 14 2018........SUNRISE 604 AM PDT SUNSET 822 PM PDT  
AUGUST 15 2018........SUNRISE 606 AM PDT SUNSET 821 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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