036  
CDUS41 KLWX 162122  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
522 PM EDT THU SEP 16 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 16 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 85 2:08 PM 97 1991 79 6 73  
MINIMUM 69 6:28 AM 37 1984 58 11 46  
AVERAGE 77 69 8 60  
 
PRECIPITATION (IN)  
TODAY 0.24 2.05 1999 0.15 0.09 0.00  
MONTH TO DATE 2.67 2.04 0.63 1.16  
SINCE SEP 1 2.67 2.04 0.63 1.16  
SINCE JAN 1 27.26 31.26 -4.00 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 5  
MONTH TO DATE 0 7 -7 11  
SINCE SEP 1 0 7 -7 11  
SINCE JUL 1 0 8 -8 11  
 
COOLING  
TODAY 12 5 7 0  
MONTH TO DATE 117 107 10 116  
SINCE SEP 1 117 107 10 116  
SINCE JAN 1 1369 1163 206 1368    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION E (110)  
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION E (110)  
AVERAGE WIND SPEED 5.6  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
THUNDERSTORM  
HEAVY RAIN  
RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 5:00 AM  
LOWEST 63 2:00 PM  
AVERAGE 78  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 79 97 1991  
MINIMUM TEMPERATURE (F) 58 35 1986  
 
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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