713  
CDUS41 KLWX 100524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
124 AM EDT SAT APR 10 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 9 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 60 5:51 PM 89 2001 65 -5 69  
MINIMUM 52 3:50 AM 23 1977 40 12 45  
AVERAGE 56 52 4 57  
 
PRECIPITATION (IN)  
YESTERDAY 0.48 1.02 1998 0.13 0.35 0.12  
MONTH TO DATE 0.75 1.09 -0.34 0.48  
SINCE MAR 1 3.02 4.47 -1.45 2.47  
SINCE JAN 1 9.18 9.89 -0.71 9.04  
 
SNOWFALL (IN)  
YESTERDAY 0.0 2.6 1982 0.0 0.0 0.0  
MONTH TO DATE T 0.2 -0.2 0.0  
SINCE MAR 1 T 3.0 -3.0 T  
SINCE JUL 1 12.0 21.9 -9.9 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 9 13 -4 8  
MONTH TO DATE 111 129 -18 81  
SINCE MAR 1 626 776 -150 529  
SINCE JUL 1 3819 4366 -547 3673  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE MAR 1 4 3 1 3  
SINCE JAN 1 4 3 1 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION E (100)  
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION E (90)  
AVERAGE WIND SPEED 5.6  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 8:00 AM  
LOWEST 69 12:00 AM  
AVERAGE 81  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 65 89 2013  
MINIMUM TEMPERATURE (F) 41 19 1985  
 
SUNRISE AND SUNSET  
APRIL 10 2021.........SUNRISE 6:40 AM EDT SUNSET 7:42 PM EDT  
APRIL 11 2021.........SUNRISE 6:39 AM EDT SUNSET 7:43 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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