288  
CDUS41 KLWX 300524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
124 AM EDT FRI APR 30 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 29 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 83 1:44 PM 89 2017 71 12 75  
MINIMUM 65 5:53 AM 32 1987 46 19 40  
AVERAGE 74 58 16 58  
 
PRECIPITATION (IN)  
YESTERDAY 0.05 1.19 2014 0.12 -0.07 T  
MONTH TO DATE 2.27 3.36 -1.09 4.18  
SINCE MAR 1 4.54 6.74 -2.20 6.17  
SINCE JAN 1 10.70 12.16 -1.46 12.74  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.0 2001 0.0 0.0 0.0  
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 0 7 -7 7  
MONTH TO DATE 296 330 -34 378  
SINCE MAR 1 811 977 -166 826  
SINCE JUL 1 4004 4567 -563 3970  
 
COOLING  
YESTERDAY 9 1 8 0  
MONTH TO DATE 22 17 5 0  
SINCE MAR 1 26 20 6 3  
SINCE JAN 1 26 20 6 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 30 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 40 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED 7.0  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 90 6:00 AM  
LOWEST 45 9:00 PM  
AVERAGE 68  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 71 86 1974  
2007  
2017  
MINIMUM TEMPERATURE (F) 46 29 1977  
 
SUNRISE AND SUNSET  
APRIL 30 2021.........SUNRISE 6:13 AM EDT SUNSET 8:02 PM EDT  
MAY 1 2021...........SUNRISE 6:12 AM EDT SUNSET 8:03 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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