610  
CDUS41 KLWX 160521  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
121 AM EDT SUN MAY 16 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 15 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 77 4:09 PM 90 1962 75 2 86  
MINIMUM 39 5:09 AM 37 1984 53 -14 62  
2016  
AVERAGE 58 64 -6 74  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.40 2003 0.16 -0.16 0.00  
MONTH TO DATE 1.02 2.22 -1.20 1.62  
SINCE MAR 1 5.57 9.19 -3.62 9.17  
SINCE JAN 1 11.73 14.74 -3.01 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 7 4 3 0  
MONTH TO DATE 104 73 31 154  
SINCE MAR 1 919 1040 -121 984  
SINCE JUL 1 4112 4550 -438 4128  
 
COOLING  
YESTERDAY 0 2 -2 9  
MONTH TO DATE 17 26 -9 13  
SINCE MAR 1 43 48 -5 16  
SINCE JAN 1 43 48 -5 16    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION NE (60)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION NE (30)  
AVERAGE WIND SPEED 2.7  
 
SKY COVER  
AVERAGE SKY COVER 0.3  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 6:00 AM  
LOWEST 20 12:00 PM  
AVERAGE 59  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 75 90 1998  
MINIMUM TEMPERATURE (F) 53 35 2000  
 
SUNRISE AND SUNSET  
MAY 16 2021...........SUNRISE 5:56 AM EDT SUNSET 8:17 PM EDT  
MAY 17 2021...........SUNRISE 5:55 AM EDT SUNSET 8:18 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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