480  
CDUS41 KLWX 232131  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
531 PM EDT THU SEP 23 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 23 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 76 1:25 PM 94 2019 77 -1 81  
MINIMUM 61 7:17 AM 33 1983 55 6 45  
AVERAGE 69 66 3 63  
 
PRECIPITATION (IN)  
TODAY 1.43 1.74 2003 0.12 1.31 0.00  
MONTH TO DATE 4.72 2.98 1.74 1.48  
SINCE SEP 1 4.72 2.98 1.74 1.48  
SINCE JAN 1 29.31 32.20 -2.89 35.70  
 
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 2 -2 2  
MONTH TO DATE 0 20 -20 55  
SINCE SEP 1 0 20 -20 55  
SINCE JUL 1 0 21 -21 55  
 
COOLING  
TODAY 4 3 1 0  
MONTH TO DATE 171 134 37 117  
SINCE SEP 1 171 134 37 117  
SINCE JAN 1 1423 1190 233 1369    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 22 HIGHEST WIND DIRECTION SE (150)  
HIGHEST GUST SPEED 37 HIGHEST GUST DIRECTION S (160)  
AVERAGE WIND SPEED 8.7  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
THUNDERSTORM  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 3:00 AM  
LOWEST 53 4:00 PM  
AVERAGE 75  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 76 97 2010  
MINIMUM TEMPERATURE (F) 55 30 1974  
 
SUNRISE AND SUNSET  
SEPTEMBER 23 2021.....SUNRISE 6:59 AM EDT SUNSET 7:05 PM EDT  
SEPTEMBER 24 2021.....SUNRISE 7:00 AM EDT SUNSET 7:03 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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