002  
CDUS41 KLWX 130527  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
127 AM EDT FRI SEP 13 2024  
   
...............................  
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 12 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 82 3:28 PM 95 1998 81 1 91  
2019  
MINIMUM 57 3:37 AM 40 1967 60 -3 65  
AVERAGE 70 70 0 78  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.18 1965 0.13 -0.13 0.81  
MONTH TO DATE T 1.48 -1.48 3.50  
SINCE SEP 1 T 1.48 -1.48 3.50  
SINCE JAN 1 25.78 30.70 -4.92 22.72  
 
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 1 -1 0  
MONTH TO DATE 11 3 8 0  
SINCE SEP 1 11 3 8 0  
SINCE JUL 1 13 4 9 0  
 
COOLING  
YESTERDAY 5 6 -1 13  
MONTH TO DATE 34 86 -52 178  
SINCE SEP 1 34 86 -52 178  
SINCE JAN 1 1448 1142 306 1293    
...............................................................  
 
WIND (MPH)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION E (110)  
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION SE (130)  
AVERAGE WIND SPEED 3.6  
 
SKY COVER  
AVERAGE SKY COVER 0.3  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 7:00 AM  
LOWEST 37 4:00 PM  
AVERAGE 67  
   
......................................................  
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 80 94 1974  
MINIMUM TEMPERATURE (F) 59 43 1985  
 
SUNRISE AND SUNSET  
SEPTEMBER 13 2024.....SUNRISE 6:50 AM EDT SUNSET 7:20 PM EDT  
SEPTEMBER 14 2024.....SUNRISE 6:51 AM EDT SUNSET 7:19 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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