Weather Service Report


164 
CDUS46 KSEW 210827
CLISEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA                                  
127 AM PDT MON SEP 21 2020


................................... 

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 20 2020...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1945 TO 2020


WEATHER ITEM   OBSERVED TIME   RECORD YEAR NORMAL DEPARTURE LAST     
                VALUE   (LST)  VALUE       VALUE  FROM      YEAR     
                                                  NORMAL             
..................................................................
TEMPERATURE (F)                                                     
 YESTERDAY                                                           
  MAXIMUM         71        MM  88    1974  69      2       69        
  MINIMUM         58        MM  40    1949  51      7       58        
  AVERAGE         65                        60      5       64      
                                                                     
PRECIPITATION (IN)                                                   
  YESTERDAY        0.07          1.05 1972   0.06   0.01      T      
  MONTH TO DATE    0.46                      0.89  -0.43     2.53    
  SINCE OCT 1     37.83                     36.88   0.95    35.03    
  SINCE JAN 1     24.49                     21.48   3.01    19.75    
                                                                     
DEGREE DAYS                                                          
 HEATING                                                             
  YESTERDAY        0                         5     -5        1       
  MONTH TO DATE   24                        66    -42       26       
  SINCE SEP 1     24                        66    -42       26       
  SINCE JUL 1     59                       151    -92       39       
                                                                     
 COOLING                                                             
  YESTERDAY        0                         0      0        0       
  MONTH TO DATE   67                        19     48       32       
  SINCE SEP 1     67                        19     48       32       
  SINCE JAN 1    328                       187    141      323       
..................................................................


WIND (MPH)                                                           
  RESULTANT WIND SPEED   2   RESULTANT WIND DIRECTION   S (190)      
  HIGHEST WIND SPEED     8   HIGHEST WIND DIRECTION     W (260)      
  HIGHEST GUST SPEED    MM   HIGHEST GUST DIRECTION    MM            
  AVERAGE WIND SPEED     3.6                                         

                                                                     
SKY COVER                                                            
  AVERAGE SKY COVER 0.7                                              

                                                                     
WEATHER CONDITIONS                                                  
 THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.                        
  LIGHT RAIN                                                         
  FOG                                                                

                                                                     
RELATIVE HUMIDITY (PERCENT)                                          
 HIGHEST   100           700 AM                                     
 LOWEST     53           500 PM                                     
 AVERAGE    77                                                       

..........................................................

                                                                     
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 2020.....SUNRISE   655 AM PDT   SUNSET   708 PM PDT   
SEPTEMBER 22 2020.....SUNRISE   657 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.                                          




$$


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Western Regional Climate Center, wrcc@dri.edu