856  
CDUS41 KLWX 172125  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
525 PM EDT FRI SEP 17 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 17 2021
 
 
VALID TODAY AS OF 0500 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 82 3:58 PM 97 1991 79 3 72  
MINIMUM 72 7:48 AM 35 1986 58 14 54  
AVERAGE 77 68 9 63  
 
PRECIPITATION (IN)  
TODAY T 1.71 2004 0.14 -0.14 0.18  
MONTH TO DATE 3.04 2.18 0.86 1.34  
SINCE SEP 1 3.04 2.18 0.86 1.34  
SINCE JAN 1 27.63 31.40 -3.77 35.56  
 
SNOWFALL (IN)  
TODAY 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  
TODAY 0 1 -1 2  
MONTH TO DATE 0 8 -8 13  
SINCE SEP 1 0 8 -8 13  
SINCE JUL 1 0 9 -9 13  
 
COOLING  
TODAY 12 5 7 0  
MONTH TO DATE 129 112 17 116  
SINCE SEP 1 129 112 17 116  
SINCE JAN 1 1381 1168 213 1368    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION E (100)  
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION E (90)  
AVERAGE WIND SPEED 6.6  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 94 1:00 AM  
LOWEST 65 4:00 PM  
AVERAGE 80  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 79 91 1978  
MINIMUM TEMPERATURE (F) 57 37 1990  
 
SUNRISE AND SUNSET  
SEPTEMBER 17 2021.....SUNRISE 6:53 AM EDT SUNSET 7:14 PM EDT  
SEPTEMBER 18 2021.....SUNRISE 6:54 AM EDT SUNSET 7:13 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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