970  
CDUS41 KLWX 230524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
124 AM EDT SUN MAY 23 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 22 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 89R 3:58 PM 88 1975 76 13 75  
1984  
2004  
MINIMUM 54 5:26 AM 31 2002 55 -1 59  
AVERAGE 72 66 6 67  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.07 2001 0.16 -0.16 0.40  
MONTH TO DATE 1.03 3.32 -2.29 2.02  
SINCE MAR 1 5.58 10.29 -4.71 9.57  
SINCE JAN 1 11.74 15.84 -4.10 16.14  
 
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 0 3 -3 0  
MONTH TO DATE 117 96 21 175  
SINCE MAR 1 932 1063 -131 1005  
SINCE JUL 1 4125 4573 -448 4149  
 
COOLING  
YESTERDAY 7 3 4 2  
MONTH TO DATE 35 47 -12 21  
SINCE MAR 1 61 69 -8 24  
SINCE JAN 1 61 69 -8 24    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 26 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 6.9  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 86 5:00 AM  
LOWEST 35 1:00 PM  
AVERAGE 61  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 77 92 1964  
MINIMUM TEMPERATURE (F) 55 39 1971  
1990  
2002  
 
SUNRISE AND SUNSET  
MAY 23 2021...........SUNRISE 5:51 AM EDT SUNSET 8:23 PM EDT  
MAY 24 2021...........SUNRISE 5:50 AM EDT SUNSET 8:24 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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