509  
CDUS41 KLWX 300530  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
130 AM EDT SUN MAY 30 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 29 2021
 
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
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 60 12:11 AM 97 1969 78 -18 86  
MINIMUM 50 11:59 PM 40 1997 57 -7 66  
AVERAGE 55 67 -12 76  
 
PRECIPITATION (IN)  
YESTERDAY 0.57 1.00 1984 0.16 0.41 0.08  
MONTH TO DATE 2.84 4.42 -1.58 2.40  
SINCE MAR 1 7.39 11.39 -4.00 9.95  
SINCE JAN 1 13.55 16.94 -3.39 16.52  
 
SNOWFALL (IN)  
YESTERDAY 0.0 MM MM 0.0 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0 0.0  
SINCE MAR 1 T 4.0 -4.0 T  
SINCE JUL 1 12.0 21.0 -9.0 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 10 2 8 0  
MONTH TO DATE 127 112 15 175  
SINCE MAR 1 942 1079 -137 1005  
SINCE JUL 1 4135 4589 -454 4149  
 
COOLING  
YESTERDAY 0 4 -4 11  
MONTH TO DATE 83 75 8 65  
SINCE MAR 1 109 97 12 68  
SINCE JAN 1 109 97 12 68    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION NE (50)  
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION NE (40)  
AVERAGE WIND SPEED 10.8  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 3:00 AM  
LOWEST 77 4:00 PM  
AVERAGE 87  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 78 95 1987  
1991  
2006  
MINIMUM TEMPERATURE (F) 57 38 1996  
 
SUNRISE AND SUNSET  
MAY 30 2021...........SUNRISE 5:47 AM EDT SUNSET 8:28 PM EDT  
MAY 31 2021...........SUNRISE 5:46 AM EDT SUNSET 8:29 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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