023  
CDUS41 KLWX 280529  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
129 AM EDT WED APR 28 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 27 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 85 5:02 PM 92 1990 70 15 59  
2009  
MINIMUM 42 5:49 AM 31 1972 45 -3 41  
1987  
AVERAGE 64 58 6 50  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.65 1973 0.12 -0.12 0.06  
MONTH TO DATE 2.22 3.12 -0.90 4.08  
SINCE MAR 1 4.49 6.50 -2.01 6.07  
SINCE JAN 1 10.65 11.92 -1.27 12.64  
 
SNOWFALL (IN)  
YESTERDAY 0.0 T 1994 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 1 8 -7 15  
MONTH TO DATE 296 315 -19 352  
SINCE MAR 1 811 962 -151 800  
SINCE JUL 1 4004 4552 -548 3944  
 
COOLING  
YESTERDAY 0 1 -1 0  
MONTH TO DATE 5 15 -10 0  
SINCE MAR 1 9 18 -9 3  
SINCE JAN 1 9 18 -9 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION S (200)  
AVERAGE WIND SPEED 6.3  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 86 2:00 AM  
LOWEST 31 3:00 PM  
AVERAGE 59  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 71 88 1981  
1983  
1990  
MINIMUM TEMPERATURE (F) 46 32 1972  
1993  
 
SUNRISE AND SUNSET  
APRIL 28 2021.........SUNRISE 6:15 AM EDT SUNSET 8:00 PM EDT  
APRIL 29 2021.........SUNRISE 6:14 AM EDT SUNSET 8:01 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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