168  
CDUS46 KSEW 200831  
CLISEA  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SEATTLE WA  
131 AM PDT SAT OCT 20 2018  
 
   
...............................
 
 
 
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR OCTOBER 19 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 61 347 PM 72 2014 58 3 54  
MINIMUM 45 642 AM 28 1949 45 0 50  
AVERAGE 53 52 1 52  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.05 1958 0.12 -0.12 1.04  
MONTH TO DATE 1.09 1.73 -0.64 3.03  
SINCE OCT 1 1.09 1.73 -0.64 3.03  
SINCE JAN 1 21.54 23.82 -2.28 32.04  
 
SNOWFALL (IN)  
YESTERDAY 0.0 MM MM 0.0  
MONTH TO DATE 0.0 0.0  
SINCE OCT 1 0.0 0.0  
SINCE JUL 1 0.0 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 12 13 -1 13  
MONTH TO DATE 187 202 -15 220  
SINCE SEP 1 279 334 -55 298  
SINCE JUL 1 303 419 -116 305  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE SEP 1 19 21 -2 75  
SINCE JAN 1 404 189 215 392    
..............................................................
 
 
WIND (MPH)  
RESULTANT WIND SPEED 1 RESULTANT WIND DIRECTION NW (310)  
HIGHEST WIND SPEED 9 HIGHEST WIND DIRECTION N (10)  
HIGHEST GUST SPEED 12 HIGHEST GUST DIRECTION N (10)  
AVERAGE WIND SPEED 2.8  
 
 
SKY COVER  
AVERAGE SKY COVER 0.3  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
FOG W/VISIBILITY <= 1/4 MILE  
HAZE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 800 AM  
LOWEST 64 300 PM  
AVERAGE 82  
   
......................................................
 
 
 
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 58 69 1987  
MINIMUM TEMPERATURE (F) 45 29 1949  
 
 
SUNRISE AND SUNSET  
OCTOBER 20 2018.......SUNRISE 735 AM PDT SUNSET 612 PM PDT  
OCTOBER 21 2018.......SUNRISE 737 AM PDT SUNSET 610 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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