693  
CDUS41 KLWX 130523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT TUE APR 13 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 12 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 9:58 AM 87 1977 66 -2 72  
MINIMUM 49 11:59 PM 23 1982 41 8 36  
AVERAGE 57 53 4 54  
 
PRECIPITATION (IN)  
YESTERDAY 0.06 1.45 2004 0.11 -0.05 0.24  
MONTH TO DATE 1.09 1.44 -0.35 0.72  
SINCE MAR 1 3.36 4.82 -1.46 2.71  
SINCE JAN 1 9.52 10.24 -0.72 9.28  
 
SNOWFALL (IN)  
YESTERDAY 0.0 1.0 1973 0.0 0.0 0.0  
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 8 12 -4 11  
MONTH TO DATE 122 166 -44 130  
SINCE MAR 1 637 813 -176 578  
SINCE JUL 1 3830 4403 -573 3722  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 5 0 5 0  
SINCE MAR 1 9 3 6 3  
SINCE JAN 1 9 3 6 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION SE (140)  
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION NE (40)  
AVERAGE WIND SPEED 5.2  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 9:00 PM  
LOWEST 60 1:00 AM  
AVERAGE 77  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 66 87 1977  
MINIMUM TEMPERATURE (F) 41 24 1990  
 
SUNRISE AND SUNSET  
APRIL 13 2021.........SUNRISE 6:36 AM EDT SUNSET 7:45 PM EDT  
APRIL 14 2021.........SUNRISE 6:34 AM EDT SUNSET 7:46 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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