511  
CDUS46 KSEW 220839  
CLISEA  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SEATTLE WA  
139 AM PDT SAT JUL 22 2017  
 
   
...............................
 
 
   
..THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR JULY 21 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 78 518 PM 97 2006 77 1 84  
MINIMUM 55 421 AM 48 1951 56 -1 58  
AVERAGE 67 66 1 71  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.29 2007 0.01 -0.01 0.00  
MONTH TO DATE 0.00 0.52 -0.52 0.39  
SINCE OCT 1 48.80 34.93 13.87 47.62  
SINCE JAN 1 28.40 19.53 8.87 23.23  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 1 -1 0  
MONTH TO DATE 5 39 -34 10  
SINCE JUN 1 104 183 -79 101  
SINCE JUL 1 5 39 -34 10  
 
COOLING  
YESTERDAY 2 3 -1 6  
MONTH TO DATE 39 43 -4 29  
SINCE JUN 1 82 64 18 83  
SINCE JAN 1 101 70 31 109    
..............................................................
 
 
WIND (MPH)  
RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION W (260)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION W (250)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION W (250)  
AVERAGE WIND SPEED 4.8  
 
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 400 AM  
LOWEST 38 400 PM  
AVERAGE 66  
   
......................................................
 
 
 
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 77 96 2006  
MINIMUM TEMPERATURE (F) 56 49 1973  
1954  
 
 
SUNRISE AND SUNSET  
JULY 22 2017..........SUNRISE 536 AM PDT SUNSET 855 PM PDT  
JULY 23 2017..........SUNRISE 537 AM PDT SUNSET 854 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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