424  
CDUS41 KLWX 190528  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
128 AM EDT MON APR 19 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 18 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 64 1:22 PM 90 1976 68 -4 54  
MINIMUM 42 6:02 AM 29 2018 43 -1 33  
AVERAGE 53 55 -2 44  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.59 1978 0.10 -0.10 0.06  
MONTH TO DATE 1.51 2.09 -0.58 2.85  
SINCE MAR 1 3.78 5.47 -1.69 4.84  
SINCE JAN 1 9.94 10.89 -0.95 11.41  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.0 2001 0.0 0.0 0.0  
2002  
MONTH TO DATE T 0.3 -0.3 T  
SINCE MAR 1 T 3.1 -3.1 T  
SINCE JUL 1 12.0 22.0 -10.0 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 12 10 2 21  
MONTH TO DATE 195 233 -38 232  
SINCE MAR 1 710 880 -170 680  
SINCE JUL 1 3903 4470 -567 3824  
 
COOLING  
YESTERDAY 0 1 -1 0  
MONTH TO DATE 5 6 -1 0  
SINCE MAR 1 9 9 0 3  
SINCE JAN 1 9 9 0 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 4.4  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 82 1:00 AM  
LOWEST 35 2:00 PM  
AVERAGE 59  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 68 91 2002  
MINIMUM TEMPERATURE (F) 43 27 1990  
2001  
 
SUNRISE AND SUNSET  
APRIL 19 2021.........SUNRISE 6:27 AM EDT SUNSET 7:51 PM EDT  
APRIL 20 2021.........SUNRISE 6:26 AM EDT SUNSET 7:52 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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