155  
CDUS41 KLWX 150522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
122 AM EDT THU APR 15 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 14 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 61 9:39 AM 87 1960 66 -5 57  
MINIMUM 48 1:52 AM 20 1975 42 6 38  
AVERAGE 55 54 1 48  
 
PRECIPITATION (IN)  
YESTERDAY 0.42 2.13 1970 0.11 0.31 0.23  
MONTH TO DATE 1.51 1.66 -0.15 2.74  
SINCE MAR 1 3.78 5.04 -1.26 4.73  
SINCE JAN 1 9.94 10.46 -0.52 11.30  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.0 2001 0.0 0.0 0.0  
2002  
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 10 12 -2 17  
MONTH TO DATE 138 190 -52 148  
SINCE MAR 1 653 837 -184 596  
SINCE JUL 1 3846 4427 -581 3740  
 
COOLING  
YESTERDAY 0 1 -1 0  
MONTH TO DATE 5 2 3 0  
SINCE MAR 1 9 5 4 3  
SINCE JAN 1 9 5 4 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION SW (210)  
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION S (200)  
AVERAGE WIND SPEED 3.8  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 7:00 PM  
LOWEST 69 9:00 AM  
AVERAGE 83  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 67 87 1967  
MINIMUM TEMPERATURE (F) 42 28 1971  
1997  
 
SUNRISE AND SUNSET  
APRIL 15 2021.........SUNRISE 6:33 AM EDT SUNSET 7:47 PM EDT  
APRIL 16 2021.........SUNRISE 6:31 AM EDT SUNSET 7:48 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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