546  
CDUS41 KLWX 102122  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
522 PM EDT FRI SEP 10 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 10 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 77 3:59 PM 99 1983 82 -5 83  
MINIMUM 58 6:15 AM 43 1981 60 -2 74  
AVERAGE 68 71 -3 79  
 
PRECIPITATION (IN)  
TODAY 0.00 1.50 1968 0.12 -0.12 0.11  
MONTH TO DATE 2.43 1.22 1.21 1.16  
SINCE SEP 1 2.43 1.22 1.21 1.16  
SINCE JAN 1 27.02 30.44 -3.42 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 1 -1 0  
SINCE SEP 1 0 1 -1 0  
SINCE JUL 1 0 2 -2 0  
 
COOLING  
TODAY 3 6 -3 14  
MONTH TO DATE 58 74 -16 91  
SINCE SEP 1 58 74 -16 91  
SINCE JAN 1 1310 1130 180 1343    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 31 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 11.4  
 
SKY COVER  
AVERAGE SKY COVER 0.2  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 83 12:00 AM  
LOWEST 39 3:00 PM  
AVERAGE 61  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 81 99 1983  
MINIMUM TEMPERATURE (F) 60 40 1976  
 
SUNRISE AND SUNSET  
SEPTEMBER 10 2021.....SUNRISE 6:47 AM EDT SUNSET 7:26 PM EDT  
SEPTEMBER 11 2021.....SUNRISE 6:48 AM EDT SUNSET 7:24 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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