954  
CDUS46 KSEW 170927  
CLISEA  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SEATTLE  
127 AM PST TUE DEC 17 2024  
   
...............................  
 
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR DECEMBER 16 2024...  
 
CLIMATE NORMAL PERIOD 1991 TO 2020  
CLIMATE RECORD PERIOD 1945 TO 2024  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................  
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 49 318 PM 57 1974 47 2 51  
MINIMUM 39 355 AM 10 1964 37 2 36  
AVERAGE 44 42 2 44  
 
PRECIPITATION (IN)  
YESTERDAY 0.23 1.32 1997 0.18 0.05 0.00  
MONTH TO DATE 1.49 2.97 -1.48 6.70  
SINCE OCT 1 9.39 13.19 -3.80 15.37  
SINCE JAN 1 28.17 36.59 -8.42 33.19  
 
SNOWFALL (IN)  
YESTERDAY 0.0 1.1 1992 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 21 23 -2 21  
MONTH TO DATE 376 361 15 312  
SINCE DEC 1 376 361 15 312  
SINCE JUL 1 1417 1422 -5 1315  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 315 263 52 378    
...............................................................  
 
WIND (MPH)  
RESULTANT WIND SPEED 5 RESULTANT WIND DIRECTION E (110)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION SE (120)  
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION SE (120)  
AVERAGE WIND SPEED 7.2  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 700 AM  
LOWEST 65 1000 PM  
AVERAGE 79  
   
......................................................  
 
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 47 57 1994  
MINIMUM TEMPERATURE (F) 37 11 1964  
 
SUNRISE AND SUNSET  
DECEMBER 17 2024......SUNRISE 752 AM PST SUNSET 419 PM PST  
DECEMBER 18 2024......SUNRISE 753 AM PST SUNSET 420 PM PST  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 
 
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