813  
CDUS41 KLWX 050524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
124 AM EDT WED MAY 05 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 4 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 83 2:04 PM 90 2001 72 11 73  
2018  
MINIMUM 64 11:22 PM 31 1967 49 15 53  
AVERAGE 74 61 13 63  
 
PRECIPITATION (IN)  
YESTERDAY 0.49 1.23 1996 0.15 0.34 0.01  
MONTH TO DATE 0.57 0.57 -0.00 0.88  
SINCE MAR 1 5.12 7.54 -2.42 8.43  
SINCE JAN 1 11.28 13.09 -1.81 15.00  
 
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 6 -6 2  
MONTH TO DATE 7 24 -17 15  
SINCE MAR 1 822 991 -169 845  
SINCE JUL 1 4015 4501 -486 3989  
 
COOLING  
YESTERDAY 9 1 8 0  
MONTH TO DATE 15 4 11 4  
SINCE MAR 1 41 26 15 7  
SINCE JAN 1 41 26 15 7    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 26 HIGHEST WIND DIRECTION W (270)  
HIGHEST GUST SPEED 39 HIGHEST GUST DIRECTION W (280)  
AVERAGE WIND SPEED 5.7  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 5:00 AM  
LOWEST 53 1:00 PM  
AVERAGE 75  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 73 88 1980  
MINIMUM TEMPERATURE (F) 50 29 1976  
 
SUNRISE AND SUNSET  
MAY 5 2021...........SUNRISE 6:07 AM EDT SUNSET 8:07 PM EDT  
MAY 6 2021...........SUNRISE 6:06 AM EDT SUNSET 8:08 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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