311  
CDUS41 KLWX 230520  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
120 AM EDT FRI APR 23 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 22 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 53 3:04 PM 92 1985 69 -16 62  
MINIMUM 30 5:42 AM 27 1975 44 -14 37  
AVERAGE 42 56 -14 50  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.88 2006 0.12 -0.12 0.00  
MONTH TO DATE 1.51 2.54 -1.03 2.86  
SINCE MAR 1 3.78 5.92 -2.14 4.85  
SINCE JAN 1 9.94 11.34 -1.40 11.42  
 
SNOWFALL (IN)  
YESTERDAY 0.0 T 1993 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 23 9 14 15  
MONTH TO DATE 246 272 -26 282  
SINCE MAR 1 761 919 -158 730  
SINCE JUL 1 3954 4509 -555 3874  
 
COOLING  
YESTERDAY 0 1 -1 0  
MONTH TO DATE 5 10 -5 0  
SINCE MAR 1 9 13 -4 3  
SINCE JAN 1 9 13 -4 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 30 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 41 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 11.5  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 72 5:00 AM  
LOWEST 28 5:00 PM  
AVERAGE 50  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 69 88 2001  
MINIMUM TEMPERATURE (F) 44 30 1989  
 
SUNRISE AND SUNSET  
APRIL 23 2021.........SUNRISE 6:22 AM EDT SUNSET 7:55 PM EDT  
APRIL 24 2021.........SUNRISE 6:20 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.  
 

 
 
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