925  
CDUS41 KLWX 310548  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
148 AM EDT MON MAY 31 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 30 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 57 2:53 PM 95 1987 78 -21 82  
1991  
2006  
MINIMUM 49 5:35 AM 38 1996 57 -8 65  
AVERAGE 53 68 -15 74  
 
PRECIPITATION (IN)  
YESTERDAY 0.03 2.65 1960 0.15 -0.12 0.00  
MONTH TO DATE 2.87 4.57 -1.70 2.40  
SINCE MAR 1 7.42 11.54 -4.12 9.95  
SINCE JAN 1 13.58 17.09 -3.51 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 12 2 10 0  
MONTH TO DATE 139 114 25 175  
SINCE MAR 1 954 1081 -127 1005  
SINCE JUL 1 4147 4591 -444 4149  
 
COOLING  
YESTERDAY 0 4 -4 9  
MONTH TO DATE 83 79 4 74  
SINCE MAR 1 109 101 8 77  
SINCE JAN 1 109 101 8 77    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION N (340)  
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED 9.0  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 89 12:00 AM  
LOWEST 69 3:00 PM  
AVERAGE 79  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 79 94 1991  
2011  
MINIMUM TEMPERATURE (F) 57 37 1984  
 
SUNRISE AND SUNSET  
MAY 31 2021...........SUNRISE 5:46 AM EDT SUNSET 8:29 PM EDT  
JUNE 1 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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