884  
CDUS41 KLWX 290527  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
127 AM EDT WED SEP 29 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 28 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 2:49 PM 86 1998 75 5 80  
2019  
MINIMUM 57 2:26 AM 34 1989 53 4 65  
AVERAGE 69 64 5 73  
 
PRECIPITATION (IN)  
YESTERDAY T 1.61 2004 0.14 -0.14 0.00  
MONTH TO DATE 4.72 3.65 1.07 1.80  
SINCE SEP 1 4.72 3.65 1.07 1.80  
SINCE JAN 1 29.31 32.87 -3.56 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 4 -4 0  
MONTH TO DATE 9 35 -26 58  
SINCE SEP 1 9 35 -26 58  
SINCE JUL 1 9 36 -27 58  
 
COOLING  
YESTERDAY 4 2 2 8  
MONTH TO DATE 171 147 24 134  
SINCE SEP 1 171 147 24 134  
SINCE JAN 1 1423 1203 220 1386    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 4.9  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 90 3:00 AM  
LOWEST 60 4:00 PM  
AVERAGE 75  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 74 89 2019  
MINIMUM TEMPERATURE (F) 52 34 1978  
 
SUNRISE AND SUNSET  
SEPTEMBER 29 2021.....SUNRISE 7:04 AM EDT SUNSET 6:55 PM EDT  
SEPTEMBER 30 2021.....SUNRISE 7:05 AM EDT SUNSET 6:54 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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