920  
CDUS41 KLWX 240521  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
121 AM EDT SAT APR 24 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 23 2021
 
 
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)  
YESTERDAY  
MAXIMUM 65 3:31 PM 88 2001 69 -4 58  
MINIMUM 32 5:47 AM 30 1989 44 -12 41  
AVERAGE 49 57 -8 50  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.67 1963 0.11 -0.11 0.48  
MONTH TO DATE 1.51 2.65 -1.14 3.34  
SINCE MAR 1 3.78 6.03 -2.25 5.33  
SINCE JAN 1 9.94 11.45 -1.51 11.90  
 
SNOWFALL (IN)  
YESTERDAY 0.0 T 1986 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  
YESTERDAY 16 9 7 15  
MONTH TO DATE 262 281 -19 297  
SINCE MAR 1 777 928 -151 745  
SINCE JUL 1 3970 4518 -548 3889  
 
COOLING  
YESTERDAY 0 1 -1 0  
MONTH TO DATE 5 11 -6 0  
SINCE MAR 1 9 14 -5 3  
SINCE JAN 1 9 14 -5 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 25 HIGHEST GUST DIRECTION W (260)  
AVERAGE WIND SPEED 6.8  
 
SKY COVER  
AVERAGE SKY COVER 0.3  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 78 3:00 AM  
LOWEST 26 3:00 PM  
AVERAGE 52  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 70 85 1990  
1994  
2011  
MINIMUM TEMPERATURE (F) 45 30 1989  
 
SUNRISE AND SUNSET  
APRIL 24 2021.........SUNRISE 6:20 AM EDT SUNSET 7:56 PM EDT  
APRIL 25 2021.........SUNRISE 6:19 AM EDT SUNSET 7:57 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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