809  
CDUS41 KLWX 120521  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1221 AM EST FRI MAR 12 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MARCH 11 2021
 
 
CLIMATE NORMAL PERIOD: 1981 TO 2010  
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 79R 2:16 PM 77 1990 54 25 54  
MINIMUM 48 5:39 AM 13 1996 31 17 42  
AVERAGE 64 42 22 48  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.82 1963 0.10 -0.10 0.00  
MONTH TO DATE 0.18 1.05 -0.87 0.15  
SINCE MAR 1 0.18 1.05 -0.87 0.15  
SINCE JAN 1 6.34 6.47 -0.13 6.72  
 
SNOWFALL (IN)  
YESTERDAY 0.0 1.0 1963 0.2 -0.2 0.0  
MONTH TO DATE 0.0 1.5 -1.5 0.0  
SINCE MAR 1 0.0 1.5 -1.5 0.0  
SINCE JUL 1 12.0 20.4 -8.4 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 1 23 -22 17  
MONTH TO DATE 235 266 -31 181  
SINCE MAR 1 235 266 -31 181  
SINCE JUL 1 3428 3856 -428 3325  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE MAR 1 0 0 0 0  
SINCE JAN 1 0 0 0 0    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION SW (210)  
HIGHEST GUST SPEED 31 HIGHEST GUST DIRECTION SW (210)  
AVERAGE WIND SPEED 9.9  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 52 6:00 AM  
LOWEST 22 5:00 PM  
AVERAGE 37  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 54 89 1990  
MINIMUM TEMPERATURE (F) 32 18 1969  
1984  
1998  
 
SUNRISE AND SUNSET  
MARCH 12 2021.........SUNRISE 6:25 AM EST SUNSET 6:14 PM EST  
MARCH 13 2021.........SUNRISE 6:24 AM EST SUNSET 6:15 PM EST  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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