942  
CDUS41 KLWX 160522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
122 AM EDT FRI APR 16 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 15 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 64 1:28 PM 87 1967 67 -3 53  
MINIMUM 44 11:59 PM 28 1971 42 2 37  
1997  
AVERAGE 54 54 0 45  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.96 1983 0.11 -0.11 0.05  
MONTH TO DATE 1.51 1.77 -0.26 2.79  
SINCE MAR 1 3.78 5.15 -1.37 4.78  
SINCE JAN 1 9.94 10.57 -0.63 11.35  
 
SNOWFALL (IN)  
YESTERDAY 0.0 T 2014 0.0 0.0 T  
2020  
MONTH TO DATE T 0.2 -0.2 T  
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 11 11 0 20  
MONTH TO DATE 149 201 -52 168  
SINCE MAR 1 664 848 -184 616  
SINCE JUL 1 3857 4438 -581 3760  
 
COOLING  
YESTERDAY 0 1 -1 0  
MONTH TO DATE 5 3 2 0  
SINCE MAR 1 9 6 3 3  
SINCE JAN 1 9 6 3 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 28 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 41 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 12.1  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 12:00 AM  
LOWEST 39 4:00 PM  
AVERAGE 68  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 67 91 2002  
MINIMUM TEMPERATURE (F) 42 28 1981  
 
SUNRISE AND SUNSET  
APRIL 16 2021.........SUNRISE 6:31 AM EDT SUNSET 7:48 PM EDT  
APRIL 17 2021.........SUNRISE 6:30 AM EDT SUNSET 7:49 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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