424  
CDUS41 KLWX 112125  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
525 PM EDT SAT SEP 11 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 11 2021
 
 
VALID TODAY AS OF 0500 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 79 3:59 PM 99 1983 81 -2 82  
MINIMUM 51 6:10 AM 40 1976 60 -9 71  
AVERAGE 65 70 -5 77  
 
PRECIPITATION (IN)  
TODAY 0.00 0.72 1987 0.13 -0.13 T  
MONTH TO DATE 2.43 1.35 1.08 1.16  
SINCE SEP 1 2.43 1.35 1.08 1.16  
SINCE JAN 1 27.02 30.57 -3.55 35.38  
 
SNOWFALL (IN)  
TODAY 0.0 MM MM 0.0 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0 0.0  
SINCE SEP 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  
TODAY 0 1 -1 0  
MONTH TO DATE 0 2 -2 0  
SINCE SEP 1 0 2 -2 0  
SINCE JUL 1 0 3 -3 0  
 
COOLING  
TODAY 0 6 -6 12  
MONTH TO DATE 56 80 -24 103  
SINCE SEP 1 56 80 -24 103  
SINCE JAN 1 1308 1136 172 1355    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION S (180)  
AVERAGE WIND SPEED 3.4  
 
SKY COVER  
AVERAGE SKY COVER 0.3  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 5:00 AM  
LOWEST 45 12:00 PM  
AVERAGE 71  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 81 95 1998  
2019  
MINIMUM TEMPERATURE (F) 60 40 1967  
 
SUNRISE AND SUNSET  
SEPTEMBER 11 2021.....SUNRISE 6:48 AM EDT SUNSET 7:24 PM EDT  
SEPTEMBER 12 2021.....SUNRISE 6:49 AM EDT SUNSET 7:22 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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