720  
CDUS41 KLWX 220527  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
127 AM EDT SAT MAY 22 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 21 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 84 3:47 PM 92 1996 76 8 72  
MINIMUM 50 5:19 AM 33 1992 55 -5 50  
AVERAGE 67 65 2 61  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.06 2003 0.17 -0.17 T  
MONTH TO DATE 1.03 3.16 -2.13 1.62  
SINCE MAR 1 5.58 10.13 -4.55 9.17  
SINCE JAN 1 11.74 15.68 -3.94 15.74  
 
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 4  
MONTH TO DATE 117 93 24 175  
SINCE MAR 1 932 1060 -128 1005  
SINCE JUL 1 4125 4570 -445 4149  
 
COOLING  
YESTERDAY 2 3 -1 0  
MONTH TO DATE 28 44 -16 19  
SINCE MAR 1 54 66 -12 22  
SINCE JAN 1 54 66 -12 22    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 9 HIGHEST WIND DIRECTION S (190)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION S (180)  
AVERAGE WIND SPEED 3.8  
 
SKY COVER  
AVERAGE SKY COVER 0.2  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 83 4:00 AM  
LOWEST 34 12:00 PM  
AVERAGE 59  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 76 88 1975  
1984  
2004  
MINIMUM TEMPERATURE (F) 55 31 2002  
 
SUNRISE AND SUNSET  
MAY 22 2021...........SUNRISE 5:51 AM EDT SUNSET 8:22 PM EDT  
MAY 23 2021...........SUNRISE 5:51 AM EDT SUNSET 8:23 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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