536  
CDUS41 KLWX 290524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
124 AM EDT THU APR 29 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 28 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 88R 2:33 PM 88 1981 71 17 53  
1983  
1990  
MINIMUM 57 5:19 AM 32 1972 46 11 39  
1993  
AVERAGE 73 58 15 46  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.68 2002 0.12 -0.12 0.10  
MONTH TO DATE 2.22 3.24 -1.02 4.18  
SINCE MAR 1 4.49 6.62 -2.13 6.17  
SINCE JAN 1 10.65 12.04 -1.39 12.74  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.0 2001 0.0 0.0 0.0  
2002  
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 0 8 -8 19  
MONTH TO DATE 296 323 -27 371  
SINCE MAR 1 811 970 -159 819  
SINCE JUL 1 4004 4560 -556 3963  
 
COOLING  
YESTERDAY 8 1 7 0  
MONTH TO DATE 13 16 -3 0  
SINCE MAR 1 17 19 -2 3  
SINCE JAN 1 17 19 -2 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION W (290)  
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION W (250)  
AVERAGE WIND SPEED 5.6  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 87 6:00 AM  
LOWEST 34 1:00 PM  
AVERAGE 61  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 71 89 2017  
MINIMUM TEMPERATURE (F) 46 32 1987  
 
SUNRISE AND SUNSET  
APRIL 29 2021.........SUNRISE 6:14 AM EDT SUNSET 8:01 PM EDT  
APRIL 30 2021.........SUNRISE 6:13 AM EDT SUNSET 8:02 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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