554  
CDUS41 KLWX 220521  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
121 AM EDT THU APR 22 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 21 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 63 9:22 AM 89 1985 69 -6 68  
MINIMUM 37 11:59 PM 29 1983 44 -7 43  
AVERAGE 50 56 -6 56  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.20 1992 0.11 -0.11 0.01  
MONTH TO DATE 1.51 2.42 -0.91 2.86  
SINCE MAR 1 3.78 5.80 -2.02 4.85  
SINCE JAN 1 9.94 11.22 -1.28 11.42  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.0 2001 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 15 10 5 9  
MONTH TO DATE 223 263 -40 267  
SINCE MAR 1 738 910 -172 715  
SINCE JUL 1 3931 4500 -569 3859  
 
COOLING  
YESTERDAY 0 1 -1 0  
MONTH TO DATE 5 9 -4 0  
SINCE MAR 1 9 12 -3 3  
SINCE JAN 1 9 12 -3 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 37 HIGHEST WIND DIRECTION W (290)  
HIGHEST GUST SPEED 49 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 17.3  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 62 8:00 AM  
LOWEST 36 5:00 PM  
AVERAGE 49  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 69 92 1985  
MINIMUM TEMPERATURE (F) 44 27 1975  
 
SUNRISE AND SUNSET  
APRIL 22 2021.........SUNRISE 6:23 AM EDT SUNSET 7:54 PM EDT  
APRIL 23 2021.........SUNRISE 6:22 AM EDT SUNSET 7:55 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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