044  
CDUS41 KLWX 150522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
122 AM EDT SAT MAY 15 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 14 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 4:14 PM 89 2010 75 -1 72  
MINIMUM 39 5:28 AM 32 1996 52 -13 42  
2013  
AVERAGE 57 64 -7 57  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.87 2018 0.16 -0.16 0.07  
MONTH TO DATE 1.02 2.06 -1.04 1.62  
SINCE MAR 1 5.57 9.03 -3.46 9.17  
SINCE JAN 1 11.73 14.58 -2.85 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 8 4 4 8  
MONTH TO DATE 97 69 28 154  
SINCE MAR 1 912 1036 -124 984  
SINCE JUL 1 4105 4546 -441 4128  
 
COOLING  
YESTERDAY 0 2 -2 0  
MONTH TO DATE 17 24 -7 4  
SINCE MAR 1 43 46 -3 7  
SINCE JAN 1 43 46 -3 7    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION NW (330)  
HIGHEST GUST SPEED 26 HIGHEST GUST DIRECTION N (350)  
AVERAGE WIND SPEED 3.2  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 6:00 AM  
LOWEST 25 4:00 PM  
AVERAGE 59  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 75 90 1962  
MINIMUM TEMPERATURE (F) 53 37 1984  
2016  
 
SUNRISE AND SUNSET  
MAY 15 2021...........SUNRISE 5:57 AM EDT SUNSET 8:16 PM EDT  
MAY 16 2021...........SUNRISE 5:56 AM EDT SUNSET 8:17 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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