863  
CDUS41 KLWX 190527  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
127 AM EDT SUN SEP 19 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 18 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 88 3:50 PM 91 1978 79 9 75  
MINIMUM 66 5:55 AM 37 1990 57 9 57  
AVERAGE 77 68 9 66  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.76 2003 0.15 -0.15 0.14  
MONTH TO DATE 3.04 2.33 0.71 1.48  
SINCE SEP 1 3.04 2.33 0.71 1.48  
SINCE JAN 1 27.63 31.55 -3.92 35.70  
 
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 2 -2 0  
MONTH TO DATE 0 10 -10 13  
SINCE SEP 1 0 10 -10 13  
SINCE JUL 1 0 11 -11 13  
 
COOLING  
YESTERDAY 12 4 8 1  
MONTH TO DATE 140 116 24 117  
SINCE SEP 1 140 116 24 117  
SINCE JAN 1 1392 1172 220 1369    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 9 HIGHEST WIND DIRECTION W (290)  
HIGHEST GUST SPEED 12 HIGHEST GUST DIRECTION W (290)  
AVERAGE WIND SPEED 1.8  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 7:00 AM  
LOWEST 51 5:00 PM  
AVERAGE 74  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 78 93 1977  
1978  
MINIMUM TEMPERATURE (F) 57 36 1984  
 
SUNRISE AND SUNSET  
SEPTEMBER 19 2021.....SUNRISE 6:55 AM EDT SUNSET 7:11 PM EDT  
SEPTEMBER 20 2021.....SUNRISE 6:56 AM EDT SUNSET 7:10 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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