213  
CDUS41 KLWX 122125  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
525 PM EDT SUN SEP 12 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 12 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 86 3:50 PM 95 1998 81 5 73  
2019  
MINIMUM 60 5:08 AM 40 1967 60 0 62  
AVERAGE 73 70 3 68  
 
PRECIPITATION (IN)  
TODAY 0.00 1.18 1965 0.13 -0.13 T  
MONTH TO DATE 2.43 1.48 0.95 1.16  
SINCE SEP 1 2.43 1.48 0.95 1.16  
SINCE JAN 1 27.02 30.70 -3.68 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 3 -3 0  
SINCE SEP 1 0 3 -3 0  
SINCE JUL 1 0 4 -4 0  
 
COOLING  
TODAY 8 6 2 3  
MONTH TO DATE 64 86 -22 106  
SINCE SEP 1 64 86 -22 106  
SINCE JAN 1 1316 1142 174 1358    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION S (190)  
AVERAGE WIND SPEED 8.0  
 
SKY COVER  
AVERAGE SKY COVER 0.1  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 5:00 AM  
LOWEST 46 2:00 PM  
AVERAGE 70  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 80 94 1974  
MINIMUM TEMPERATURE (F) 59 43 1985  
 
SUNRISE AND SUNSET  
SEPTEMBER 12 2021.....SUNRISE 6:49 AM EDT SUNSET 7:22 PM EDT  
SEPTEMBER 13 2021.....SUNRISE 6:50 AM EDT SUNSET 7:21 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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