390  
CDUS41 KLWX 310524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
124 AM EDT SAT JUL 31 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JULY 30 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 91 4:05 PM 98 1988 88 3 95  
MINIMUM 69 11:58 PM 48 2014 67 2 69  
AVERAGE 80 77 3 82  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.29 2018 0.13 -0.13 0.20  
MONTH TO DATE 2.43 4.02 -1.59 4.53  
SINCE JUN 1 6.08 8.32 -2.24 9.74  
SINCE JAN 1 19.66 25.56 -5.90 26.26  
 
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 15 12 3 17  
MONTH TO DATE 411 358 53 490  
SINCE JUN 1 705 596 109 763  
SINCE JAN 1 814 702 112 840    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION N (360)  
HIGHEST GUST SPEED 28 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 8.6  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 94 2:00 AM  
LOWEST 30 4:00 PM  
AVERAGE 62  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 88 98 1999  
MINIMUM TEMPERATURE (F) 67 50 1997  
 
SUNRISE AND SUNSET  
JULY 31 2021..........SUNRISE 6:10 AM EDT SUNSET 8:22 PM EDT  
AUGUST 1 2021........SUNRISE 6:11 AM EDT SUNSET 8:21 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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