652  
CDUS46 KSEW 210847  
CLISEA  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SEATTLE WA  
147 AM PDT THU SEP 21 2017  
 
   
...............................
 
 
 
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 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 57 241 PM 88 1974 69 -12 67  
MINIMUM 50 835 AM 40 1949 51 -1 49  
AVERAGE 54 60 -6 58  
 
PRECIPITATION (IN)  
YESTERDAY 0.13 1.05 1972 0.06 0.07 0.00  
MONTH TO DATE 0.48 0.89 -0.41 1.02  
SINCE OCT 1 49.30 36.88 12.42 49.14  
SINCE JAN 1 28.90 21.48 7.42 24.75  
 
DEGREE DAYS  
HEATING  
YESTERDAY 11 5 6 7  
MONTH TO DATE 42 66 -24 59  
SINCE SEP 1 42 66 -24 59  
SINCE JUL 1 49 151 -102 80  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 67 19 48 1  
SINCE SEP 1 67 19 48 1  
SINCE JAN 1 384 187 197 289    
..............................................................
 
 
WIND (MPH)  
RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION S (190)  
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION S (190)  
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION S (180)  
AVERAGE WIND SPEED 5.1  
 
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 700 AM  
LOWEST 72 300 PM  
AVERAGE 84  
   
......................................................
 
 
 
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 69 88 1974  
1952  
MINIMUM TEMPERATURE (F) 51 39 1960  
1955  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 21 2017.....SUNRISE 655 AM PDT SUNSET 708 PM PDT  
SEPTEMBER 22 2017.....SUNRISE 656 AM PDT SUNSET 706 PM PDT  
 
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab WA Page Main Text Page