733  
CDUS41 KLWX 160523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT THU SEP 16 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 15 2021
 
 
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)  
YESTERDAY  
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)  
YESTERDAY T 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)  
YESTERDAY 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  
YESTERDAY 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  
YESTERDAY 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 18 HIGHEST WIND DIRECTION SW (210)  
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION S (190)  
AVERAGE WIND SPEED 8.5  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 90 5:00 AM  
LOWEST 48 2:00 PM  
AVERAGE 69  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 79 97 1991  
MINIMUM TEMPERATURE (F) 58 37 1984  
 
SUNRISE AND SUNSET  
SEPTEMBER 16 2021.....SUNRISE 6:52 AM EDT SUNSET 7:16 PM EDT  
SEPTEMBER 17 2021.....SUNRISE 6:53 AM EDT SUNSET 7:14 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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