771  
CDUS41 KLWX 182139  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
539 PM EDT WED AUG 18 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 18 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 MM MM 98 2009 86 MM 86  
MINIMUM 73 MM 45 1981 65 8 64  
AVERAGE MM 76 MM 75  
 
PRECIPITATION (IN)  
TODAY MM 1.39 2010 0.11 MM 0.00  
MONTH TO DATE 2.76 2.06 0.70 5.04  
SINCE JUN 1 8.84 10.51 -1.67 15.10  
SINCE JAN 1 22.42 27.75 -5.33 31.62  
 
SNOWFALL (IN)  
TODAY MM MM MM 0.0 MM 0.0  
MONTH TO DATE 0.0 0.0 0.0 0.0  
SINCE JUN 1 0.0 0.0 0.0 0.0  
SINCE JUL 1 0.0 0.0 0.0 0.0  
SNOW DEPTH MM  
 
DEGREE DAYS  
HEATING  
TODAY MM 0 MM 0  
MONTH TO DATE 0 0 0 0  
SINCE JUN 1 6 13 -7 5  
SINCE JUL 1 0 0 0 0  
 
COOLING  
TODAY MM 11 MM 10  
MONTH TO DATE 211 208 3 242  
SINCE JUN 1 925 824 101 1016  
SINCE JAN 1 1034 930 104 1093    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED MM HIGHEST WIND DIRECTION MM  
HIGHEST GUST SPEED MM HIGHEST GUST DIRECTION MM  
AVERAGE WIND SPEED MM  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
THUNDERSTORM  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 4:00 AM  
LOWEST 66 3:00 PM  
AVERAGE 82  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 86 95 2002  
2019  
MINIMUM TEMPERATURE (F) 65 51 1998  
 
SUNRISE AND SUNSET  
AUGUST 18 2021........SUNRISE 6:26 AM EDT SUNSET 8:00 PM EDT  
AUGUST 19 2021........SUNRISE 6:27 AM EDT SUNSET 7:59 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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