245  
CDUS41 KLWX 300521  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
121 AM EDT FRI JUL 30 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JULY 29 2021
 
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
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 90 2:31 PM 103 2011 88 2 92  
MINIMUM 67 4:28 AM 52 2014 67 0 70  
AVERAGE 79 77 2 81  
 
PRECIPITATION (IN)  
YESTERDAY T 0.92 2001 0.12 -0.12 0.00  
MONTH TO DATE 2.43 3.89 -1.46 4.33  
SINCE JUN 1 6.08 8.19 -2.11 9.54  
SINCE JAN 1 19.66 25.43 -5.77 26.06  
 
SNOWFALL (IN)  
YESTERDAY 0.0 MM MM 0.0 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0 0.0  
SINCE JUN 1 0.0 0.0 0.0 0.0  
SINCE JUL 1 0.0 0.0 0.0 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE JUN 1 6 13 -7 5  
SINCE JUL 1 0 0 0 0  
 
COOLING  
YESTERDAY 14 12 2 16  
MONTH TO DATE 396 346 50 473  
SINCE JUN 1 690 584 106 746  
SINCE JAN 1 799 690 109 823    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION SW (240)  
HIGHEST GUST SPEED 25 HIGHEST GUST DIRECTION SW (220)  
AVERAGE WIND SPEED 4.9  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
HAZE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 5:00 AM  
LOWEST 54 2:00 PM  
AVERAGE 75  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 88 98 1988  
MINIMUM TEMPERATURE (F) 67 48 2014  
 
SUNRISE AND SUNSET  
JULY 30 2021..........SUNRISE 6:09 AM EDT SUNSET 8:23 PM EDT  
JULY 31 2021..........SUNRISE 6:10 AM EDT SUNSET 8:22 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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