887  
CDUS41 KLWX 202127  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
527 PM EDT FRI AUG 20 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 20 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 83 2:39 PM 104 1983 86 -3 83  
MINIMUM 72 6:01 AM 47 1964 65 7 63  
1976  
1998  
AVERAGE 78 76 2 73  
 
PRECIPITATION (IN)  
TODAY 0.31 2.17 1963 0.11 0.20 0.00  
MONTH TO DATE 3.60 2.28 1.32 5.21  
SINCE JUN 1 9.68 10.73 -1.05 15.27  
SINCE JAN 1 23.26 27.97 -4.71 31.79  
 
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 JUN 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 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE JUN 1 6 13 -7 5  
SINCE JUL 1 0 0 0 0  
 
COOLING  
TODAY 13 10 3 8  
MONTH TO DATE 257 229 28 259  
SINCE JUN 1 971 845 126 1033  
SINCE JAN 1 1080 951 129 1110    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION NE (40)  
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION E (90)  
AVERAGE WIND SPEED 4.0  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
HEAVY RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 94 12:00 AM  
LOWEST 60 4:00 PM  
AVERAGE 77  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 86 96 1962  
MINIMUM TEMPERATURE (F) 65 47 1976  
 
SUNRISE AND SUNSET  
AUGUST 20 2021........SUNRISE 6:28 AM EDT SUNSET 7:57 PM EDT  
AUGUST 21 2021........SUNRISE 6:29 AM EDT SUNSET 7:56 PM EDT  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab VA Page
The Nexlab MD Page
The Nexlab WV Page Main Text Page