479  
CDUS41 KLWX 152121  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
521 PM EDT WED SEP 15 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 15 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 89 2:18 PM 95 1993 80 9 69  
1998  
MINIMUM 68 6:32 AM 38 1985 58 10 49  
AVERAGE 79 69 10 59  
 
PRECIPITATION (IN)  
TODAY 0.00 1.06 1981 0.14 -0.14 0.00  
MONTH TO DATE 2.43 1.89 0.54 1.16  
SINCE SEP 1 2.43 1.89 0.54 1.16  
SINCE JAN 1 27.02 31.11 -4.09 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 6  
MONTH TO DATE 0 6 -6 6  
SINCE SEP 1 0 6 -6 6  
SINCE JUL 1 0 7 -7 6  
 
COOLING  
TODAY 14 5 9 0  
MONTH TO DATE 105 102 3 116  
SINCE SEP 1 105 102 3 116  
SINCE JAN 1 1357 1158 199 1368    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION S (190)  
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION S (190)  
AVERAGE WIND SPEED 8.9  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 90 5:00 AM  
LOWEST 48 2:00 PM  
AVERAGE 69  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 79 97 1991  
MINIMUM TEMPERATURE (F) 58 37 1984  
 
SUNRISE AND SUNSET  
SEPTEMBER 15 2021.....SUNRISE 6:51 AM EDT SUNSET 7:18 PM EDT  
SEPTEMBER 16 2021.....SUNRISE 6:52 AM EDT SUNSET 7:16 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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