662  
CDUS41 KLWX 170523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT MON MAY 17 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 16 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 71 11:45 AM 90 1998 75 -4 82  
MINIMUM 46 4:16 AM 35 2000 53 -7 60  
AVERAGE 59 64 -5 71  
 
PRECIPITATION (IN)  
YESTERDAY 0.01 1.97 2014 0.15 -0.14 0.00  
MONTH TO DATE 1.03 2.37 -1.34 1.62  
SINCE MAR 1 5.58 9.34 -3.76 9.17  
SINCE JAN 1 11.74 14.89 -3.15 15.74  
 
SNOWFALL (IN)  
YESTERDAY MM MM MM 0.0 MM 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 6 4 2 0  
MONTH TO DATE 110 77 33 154  
SINCE MAR 1 925 1044 -119 984  
SINCE JUL 1 4118 4554 -436 4128  
 
COOLING  
YESTERDAY 0 3 -3 6  
MONTH TO DATE 17 29 -12 19  
SINCE MAR 1 43 51 -8 22  
SINCE JAN 1 43 51 -8 22    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION W (280)  
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION W (270)  
AVERAGE WIND SPEED 4.5  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 86 11:00 PM  
LOWEST 39 12:00 PM  
AVERAGE 63  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 75 93 1960  
MINIMUM TEMPERATURE (F) 53 30 1984  
 
SUNRISE AND SUNSET  
MAY 17 2021...........SUNRISE 5:55 AM EDT SUNSET 8:18 PM EDT  
MAY 18 2021...........SUNRISE 5:54 AM EDT SUNSET 8:19 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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