574  
CDUS41 KLWX 190523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT WED MAY 19 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 18 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 80 5:41 PM 91 1987 75 5 66  
MINIMUM 46 4:50 AM 33 1973 54 -8 56  
AVERAGE 63 64 -1 61  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 3.13 1988 0.15 -0.15 T  
MONTH TO DATE 1.03 2.68 -1.65 1.62  
SINCE MAR 1 5.58 9.65 -4.07 9.17  
SINCE JAN 1 11.74 15.20 -3.46 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 2 3 -1 4  
MONTH TO DATE 117 84 33 160  
SINCE MAR 1 932 1051 -119 990  
SINCE JUL 1 4125 4561 -436 4134  
 
COOLING  
YESTERDAY 0 3 -3 0  
MONTH TO DATE 17 35 -18 19  
SINCE MAR 1 43 57 -14 22  
SINCE JAN 1 43 57 -14 22    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 9 HIGHEST WIND DIRECTION W (260)  
HIGHEST GUST SPEED 13 HIGHEST GUST DIRECTION SW (210)  
AVERAGE WIND SPEED 3.0  
 
SKY COVER  
AVERAGE SKY COVER 0.2  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 3:00 AM  
LOWEST 31 4:00 PM  
AVERAGE 62  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 76 92 1996  
1997  
MINIMUM TEMPERATURE (F) 54 36 2002  
 
SUNRISE AND SUNSET  
MAY 19 2021...........SUNRISE 5:54 AM EDT SUNSET 8:19 PM EDT  
MAY 20 2021...........SUNRISE 5:53 AM EDT SUNSET 8:20 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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