408  
CDUS41 KLWX 280524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
124 AM EDT TUE SEP 28 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 27 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 80 2:56 PM 96 1998 75 5 78  
MINIMUM 50 6:24 AM 35 1984 53 -3 64  
AVERAGE 65 64 1 71  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.55 1985 0.14 -0.14 T  
MONTH TO DATE 4.72 3.51 1.21 1.80  
SINCE SEP 1 4.72 3.51 1.21 1.80  
SINCE JAN 1 29.31 32.73 -3.42 36.02  
 
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 3 -3 0  
MONTH TO DATE 9 31 -22 58  
SINCE SEP 1 9 31 -22 58  
SINCE JUL 1 9 32 -23 58  
 
COOLING  
YESTERDAY 0 2 -2 6  
MONTH TO DATE 167 145 22 126  
SINCE SEP 1 167 145 22 126  
SINCE JAN 1 1419 1201 218 1378    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION S (190)  
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION S (180)  
AVERAGE WIND SPEED 6.3  
 
SKY COVER  
AVERAGE SKY COVER 0.1  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 6:00 AM  
LOWEST 36 1:00 PM  
AVERAGE 65  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 75 86 1998  
2019  
MINIMUM TEMPERATURE (F) 53 34 1989  
 
SUNRISE AND SUNSET  
SEPTEMBER 28 2021.....SUNRISE 7:03 AM EDT SUNSET 6:57 PM EDT  
SEPTEMBER 29 2021.....SUNRISE 7:04 AM EDT SUNSET 6:55 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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