524  
CDUS41 KLWX 120523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT MON AUG 12 2024  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 11 2024
 
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1960 TO 2024  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 84 4:20 PM 99 2021 87 -3 89  
MINIMUM 64 4:02 AM 47 1972 66 -2 64  
AVERAGE 74 76 -2 77  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 4.68 1984 0.11 -0.11 T  
MONTH TO DATE 1.97 1.30 0.67 1.24  
SINCE JUN 1 5.32 9.75 -4.43 8.63  
SINCE JAN 1 22.62 26.99 -4.37 18.61  
 
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 0 13 -13 5  
SINCE JUL 1 0 0 0 0  
 
COOLING  
YESTERDAY 9 11 -2 12  
MONTH TO DATE 186 131 55 124  
SINCE JUN 1 1039 747 292 779  
SINCE JAN 1 1222 853 369 853    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION W (290)  
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 3.1  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 81 4:00 AM  
LOWEST 36 4:00 PM  
AVERAGE 59  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 87 100 2021  
MINIMUM TEMPERATURE (F) 66 51 1962  
 
SUNRISE AND SUNSET  
AUGUST 12 2024........SUNRISE 6:21 AM EDT SUNSET 8:08 PM EDT  
AUGUST 13 2024........SUNRISE 6:22 AM EDT SUNSET 8:06 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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