523  
CDUS41 KLWX 180525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
125 AM EDT THU MAR 18 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MARCH 17 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 50 6:03 PM 77 1963 56 -6 64  
MINIMUM 41 5:43 AM 16 1970 33 8 43  
AVERAGE 46 44 2 54  
 
PRECIPITATION (IN)  
YESTERDAY T 1.14 1993 0.11 -0.11 T  
MONTH TO DATE 0.18 1.70 -1.52 0.58  
SINCE MAR 1 0.18 1.70 -1.52 0.58  
SINCE JAN 1 6.34 7.12 -0.78 7.15  
 
SNOWFALL (IN)  
YESTERDAY 0.0 4.5 2014 0.1 -0.1 0.0  
MONTH TO DATE T 2.0 -2.0 T  
SINCE MAR 1 T 2.0 -2.0 T  
SINCE JUL 1 12.0 20.9 -8.9 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 19 21 -2 11  
MONTH TO DATE 338 395 -57 271  
SINCE MAR 1 338 395 -57 271  
SINCE JUL 1 3531 3985 -454 3415  
 
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 10 HIGHEST WIND DIRECTION S (180)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION S (200)  
AVERAGE WIND SPEED 3.5  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
HAZE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 12:00 AM  
LOWEST 68 4:00 PM  
AVERAGE 81  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 56 80 1989  
MINIMUM TEMPERATURE (F) 33 13 1976  
 
SUNRISE AND SUNSET  
MARCH 18 2021.........SUNRISE 7:16 AM EDT SUNSET 7:20 PM EDT  
MARCH 19 2021.........SUNRISE 7:14 AM EDT SUNSET 7:21 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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