452  
CDUS41 KLWX 050523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT TUE OCT 05 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 4 2021
 
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1960 TO 2021  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 84 12:39 PM 90 2013 72 12 68  
MINIMUM 67 11:59 PM 26 1974 50 17 40  
AVERAGE 76 61 15 54  
 
PRECIPITATION (IN)  
YESTERDAY T 0.81 1999 0.13 -0.13 0.00  
MONTH TO DATE T 0.51 -0.51 0.09  
SINCE SEP 1 4.72 4.45 0.27 2.37  
SINCE JAN 1 29.31 33.67 -4.36 36.59  
 
SNOWFALL (IN)  
YESTERDAY 0.0 MM MM 0.0 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0 0.0  
SINCE SEP 1 0.0 0.0 0.0 0.0  
SINCE JUL 1 0.0 0.0 0.0 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 5 -5 11  
MONTH TO DATE 5 19 -14 34  
SINCE SEP 1 22 64 -42 95  
SINCE JUL 1 22 65 -43 95  
 
COOLING  
YESTERDAY 11 2 9 0  
MONTH TO DATE 16 8 8 0  
SINCE SEP 1 187 160 27 135  
SINCE JAN 1 1439 1216 223 1387    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION S (190)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION W (290)  
AVERAGE WIND SPEED 4.1  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 90 4:00 AM  
LOWEST 56 2:00 PM  
AVERAGE 73  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 72 90 1967  
2013  
MINIMUM TEMPERATURE (F) 50 32 1970  
 
SUNRISE AND SUNSET  
OCTOBER 5 2021.......SUNRISE 7:10 AM EDT SUNSET 6:46 PM EDT  
OCTOBER 6 2021.......SUNRISE 7:11 AM EDT SUNSET 6:44 PM EDT  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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