764  
CDUS41 KLWX 010531  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
131 AM EDT TUE JUN 01 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 31 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 74 5:12 PM 94 1991 79 -5 75  
2011  
MINIMUM 45 2:38 AM 37 1984 57 -12 55  
AVERAGE 60 68 -8 65  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.35 2018 0.15 -0.15 0.00  
MONTH TO DATE 2.87 4.72 -1.85 2.40  
SINCE MAR 1 7.42 11.69 -4.27 9.95  
SINCE JAN 1 13.58 17.24 -3.66 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 5 2 3 0  
MONTH TO DATE 144 116 28 175  
SINCE MAR 1 959 1083 -124 1005  
SINCE JUL 1 4152 4593 -441 4149  
 
COOLING  
YESTERDAY 0 5 -5 0  
MONTH TO DATE 83 84 -1 74  
SINCE MAR 1 109 106 3 77  
SINCE JAN 1 109 106 3 77    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION N (360)  
HIGHEST GUST SPEED 26 HIGHEST GUST DIRECTION N (350)  
AVERAGE WIND SPEED 4.9  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 6:00 AM  
LOWEST 38 4:00 PM  
AVERAGE 66  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 79 95 2011  
MINIMUM TEMPERATURE (F) 58 39 1984  
 
SUNRISE AND SUNSET  
JUNE 1 2021..........SUNRISE 5:46 AM EDT SUNSET 8:30 PM EDT  
JUNE 2 2021..........SUNRISE 5:46 AM EDT SUNSET 8:30 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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