788  
CDUS41 KLWX 110525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
125 AM EDT SUN APR 11 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 10 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 70 4:29 PM 89 2013 65 5 51  
MINIMUM 54 6:28 AM 19 1985 41 13 34  
AVERAGE 62 53 9 43  
 
PRECIPITATION (IN)  
YESTERDAY 0.15 0.84 1983 0.12 0.03 0.00  
MONTH TO DATE 0.90 1.21 -0.31 0.48  
SINCE MAR 1 3.17 4.59 -1.42 2.47  
SINCE JAN 1 9.33 10.01 -0.68 9.04  
 
SNOWFALL (IN)  
YESTERDAY 0.0 T 1973 0.0 0.0 0.0  
1996  
MONTH TO DATE T 0.2 -0.2 0.0  
SINCE MAR 1 T 3.0 -3.0 T  
SINCE JUL 1 12.0 21.9 -9.9 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 3 13 -10 22  
MONTH TO DATE 114 142 -28 103  
SINCE MAR 1 629 789 -160 551  
SINCE JUL 1 3822 4379 -557 3695  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE MAR 1 4 3 1 3  
SINCE JAN 1 4 3 1 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION SE (130)  
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION SE (120)  
AVERAGE WIND SPEED 5.4  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 9:00 AM  
LOWEST 65 4:00 PM  
AVERAGE 81  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 65 87 1977  
MINIMUM TEMPERATURE (F) 41 25 1960  
1970  
1971  
 
SUNRISE AND SUNSET  
APRIL 11 2021.........SUNRISE 6:39 AM EDT SUNSET 7:43 PM EDT  
APRIL 12 2021.........SUNRISE 6:37 AM EDT SUNSET 7:44 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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