170  
CDUS41 KLWX 050529  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
129 AM EDT MON JUL 05 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JULY 4 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 84 5:22 PM 97 1999 87 -3 93  
2002  
MINIMUM 58 5:13 AM 48 1986 66 -8 70  
AVERAGE 71 77 -6 82  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.87 2001 0.14 -0.14 0.00  
MONTH TO DATE 0.79 0.56 0.23 0.12  
SINCE JUN 1 4.44 4.86 -0.42 5.33  
SINCE JAN 1 18.02 22.10 -4.08 21.85  
 
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 6 12 -6 17  
MONTH TO DATE 34 46 -12 58  
SINCE JUN 1 328 284 44 331  
SINCE JAN 1 437 390 47 408    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION SW (220)  
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION SW (210)  
AVERAGE WIND SPEED 3.0  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
HAZE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 5:00 AM  
LOWEST 48 5:00 PM  
AVERAGE 73  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 87 99 1990  
1999  
MINIMUM TEMPERATURE (F) 66 50 1971  
1996  
 
SUNRISE AND SUNSET  
JULY 5 2021..........SUNRISE 5:50 AM EDT SUNSET 8:38 PM EDT  
JULY 6 2021..........SUNRISE 5:51 AM EDT SUNSET 8:38 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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