469  
CDUS46 KSEW 210839  
CLISEA  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SEATTLE WA  
139 AM PDT SAT SEP 21 2019  
 
   
...............................
 
 
 
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 20 2019...  
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1945 TO 2019  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 69 217 PM 88 1974 69 0 66  
MINIMUM 58 1152 PM 40 1949 51 7 53  
AVERAGE 64 60 4 60  
 
PRECIPITATION (IN)  
YESTERDAY T 1.05 1972 0.06 -0.06 0.05  
MONTH TO DATE 2.53 0.89 1.64 0.91  
SINCE OCT 1 35.03 36.88 -1.85 39.18  
SINCE JAN 1 19.75 21.48 -1.73 20.32  
 
DEGREE DAYS  
HEATING  
YESTERDAY 1 5 -4 5  
MONTH TO DATE 26 66 -40 56  
SINCE SEP 1 26 66 -40 56  
SINCE JUL 1 39 151 -112 80  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 32 19 13 15  
SINCE SEP 1 32 19 13 15  
SINCE JAN 1 323 187 136 400    
..............................................................
 
 
WIND (MPH)  
RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION S (180)  
HIGHEST WIND SPEED 9 HIGHEST WIND DIRECTION SE (120)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION E (90)  
AVERAGE WIND SPEED 4.7  
 
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 600 AM  
LOWEST 58 300 PM  
AVERAGE 76  
   
......................................................
 
 
 
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  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 21 2019.....SUNRISE 654 AM PDT SUNSET 709 PM PDT  
SEPTEMBER 22 2019.....SUNRISE 656 AM PDT SUNSET 707 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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