498  
CDUS41 KLWX 280527  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
127 AM EDT SAT SEP 28 2024  
   
...............................  
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 27 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 77 5:54 PM 96 1998 75 2 72  
MINIMUM 70 2:18 AM 35 1984 53 17 54  
AVERAGE 74 64 10 63  
 
PRECIPITATION (IN)  
YESTERDAY 0.20 1.55 1985 0.14 0.06 0.00  
MONTH TO DATE 3.00 3.51 -0.51 6.61  
SINCE SEP 1 3.00 3.51 -0.51 6.61  
SINCE JAN 1 28.78 32.73 -3.95 25.83  
 
SNOWFALL (IN)  
YESTERDAY 0.0 MM MM 0.0 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0 T  
SINCE SEP 1 0.0 0.0 0.0 T  
SINCE JUL 1 0.0 0.0 0.0 T  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 3 -3 2  
MONTH TO DATE 12 31 -19 13  
SINCE SEP 1 12 31 -19 13  
SINCE JUL 1 14 32 -18 13  
 
COOLING  
YESTERDAY 9 2 7 0  
MONTH TO DATE 120 145 -25 211  
SINCE SEP 1 120 145 -25 211  
SINCE JAN 1 1534 1201 333 1326    
...............................................................  
 
WIND (MPH)  
HIGHEST WIND SPEED 22 HIGHEST WIND DIRECTION E (110)  
HIGHEST GUST SPEED 34 HIGHEST GUST DIRECTION SE (120)  
AVERAGE WIND SPEED 8.9  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 5:00 AM  
LOWEST 84 9:00 PM  
AVERAGE 91  
   
......................................................  
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 75 86 1998  
2019  
MINIMUM TEMPERATURE (F) 53 34 1989  
 
SUNRISE AND SUNSET  
SEPTEMBER 28 2024.....SUNRISE 7:03 AM EDT SUNSET 6:56 PM EDT  
SEPTEMBER 29 2024.....SUNRISE 7:04 AM EDT SUNSET 6:55 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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