751  
CDUS41 KLWX 202123  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
523 PM EDT TUE APR 20 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 20 2021
 
 
VALID TODAY AS OF 0500 PM LOCAL TIME.  
 
CLIMATE NORMAL PERIOD: 1981 TO 2010  
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 76 3:47 PM 88 1976 68 8 63  
1985  
MINIMUM 46 5:51 AM 28 1974 43 3 48  
AVERAGE 61 56 5 56  
 
PRECIPITATION (IN)  
TODAY 0.00 2.90 2008 0.11 -0.11 0.00  
MONTH TO DATE 1.51 2.31 -0.80 2.85  
SINCE MAR 1 3.78 5.69 -1.91 4.84  
SINCE JAN 1 9.94 11.11 -1.17 11.41  
 
SNOWFALL (IN)  
TODAY 0.0 T 1983 0.0 0.0 0.0  
MONTH TO DATE T 0.3 -0.3 T  
SINCE MAR 1 T 3.1 -3.1 T  
SINCE JUL 1 12.0 22.0 -10.0 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 4 10 -6 9  
MONTH TO DATE 208 253 -45 258  
SINCE MAR 1 723 900 -177 706  
SINCE JUL 1 3916 4490 -574 3850  
 
COOLING  
TODAY 0 1 -1 0  
MONTH TO DATE 5 8 -3 0  
SINCE MAR 1 9 11 -2 3  
SINCE JAN 1 9 11 -2 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 21 HIGHEST WIND DIRECTION SW (210)  
HIGHEST GUST SPEED 30 HIGHEST GUST DIRECTION SW (210)  
AVERAGE WIND SPEED 9.7  
 
SKY COVER  
AVERAGE SKY COVER 0.2  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 5:00 AM  
LOWEST 25 1:00 PM  
AVERAGE 59  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 69 89 1985  
MINIMUM TEMPERATURE (F) 44 29 1983  
 
SUNRISE AND SUNSET  
APRIL 20 2021.........SUNRISE 6:26 AM EDT SUNSET 7:52 PM EDT  
APRIL 21 2021.........SUNRISE 6:24 AM EDT SUNSET 7:53 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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