800  
CDUS41 KLWX 092131  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
531 PM EDT THU SEP 09 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 9 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 80 3:38 PM 98 2016 82 -2 80  
MINIMUM 65 5:33 AM 40 1986 61 4 66  
AVERAGE 73 71 2 73  
 
PRECIPITATION (IN)  
TODAY 0.43 1.40 2018 0.13 0.30 0.77  
MONTH TO DATE 2.43 1.10 1.33 1.05  
SINCE SEP 1 2.43 1.10 1.33 1.05  
SINCE JAN 1 27.02 30.32 -3.30 35.27  
 
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 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE SEP 1 0 0 0 0  
SINCE JUL 1 0 1 -1 0  
 
COOLING  
TODAY 8 7 1 8  
MONTH TO DATE 58 68 -10 77  
SINCE SEP 1 58 68 -10 77  
SINCE JAN 1 1310 1124 186 1329    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 5.6  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
THUNDERSTORM  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 1:00 AM  
LOWEST 60 2:00 PM  
AVERAGE 78  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 82 99 1983  
MINIMUM TEMPERATURE (F) 60 43 1981  
 
SUNRISE AND SUNSET  
SEPTEMBER 9 2021.....SUNRISE 6:46 AM EDT SUNSET 7:27 PM EDT  
SEPTEMBER 10 2021.....SUNRISE 6:47 AM EDT SUNSET 7:26 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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