137  
CDUS41 KLWX 240523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT FRI SEP 24 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 23 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 76 1:25 PM 94 2019 77 -1 81  
MINIMUM 52 11:59 PM 33 1983 55 -3 45  
AVERAGE 64 66 -2 63  
 
PRECIPITATION (IN)  
YESTERDAY 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)  
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 1 2 -1 2  
MONTH TO DATE 1 20 -19 55  
SINCE SEP 1 1 20 -19 55  
SINCE JUL 1 1 21 -20 55  
 
COOLING  
YESTERDAY 0 3 -3 0  
MONTH TO DATE 167 134 33 117  
SINCE SEP 1 167 134 33 117  
SINCE JAN 1 1419 1190 229 1369    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 22 HIGHEST WIND DIRECTION SE (150)  
HIGHEST GUST SPEED 37 HIGHEST GUST DIRECTION S (160)  
AVERAGE WIND SPEED 8.0  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 3:00 AM  
LOWEST 51 5:00 PM  
AVERAGE 74  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 76 97 2010  
MINIMUM TEMPERATURE (F) 55 30 1974  
 
SUNRISE AND SUNSET  
SEPTEMBER 24 2021.....SUNRISE 7:00 AM EDT SUNSET 7:03 PM EDT  
SEPTEMBER 25 2021.....SUNRISE 7:00 AM EDT SUNSET 7:02 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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