745  
CDUS41 KLWX 150525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
125 AM EDT SUN AUG 15 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 14 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 92 3:47 PM 100 1985 87 5 88  
MINIMUM 70 3:49 AM 49 1983 66 4 73  
AVERAGE 81 76 5 81  
 
PRECIPITATION (IN)  
YESTERDAY T 1.12 2008 0.11 -0.11 T  
MONTH TO DATE 0.74 1.63 -0.89 4.11  
SINCE JUN 1 6.82 10.08 -3.26 14.17  
SINCE JAN 1 20.40 27.32 -6.92 30.69  
 
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 16 11 5 16  
MONTH TO DATE 175 164 11 209  
SINCE JUN 1 889 780 109 983  
SINCE JAN 1 998 886 112 1060    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION N (340)  
AVERAGE WIND SPEED 5.5  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 94 12:00 AM  
LOWEST 47 5:00 PM  
AVERAGE 71  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 87 102 1988  
MINIMUM TEMPERATURE (F) 66 45 1964  
 
SUNRISE AND SUNSET  
AUGUST 15 2021........SUNRISE 6:24 AM EDT SUNSET 8:04 PM EDT  
AUGUST 16 2021........SUNRISE 6:24 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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