027  
CDUS41 KLWX 182128  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
528 PM EDT SAT SEP 18 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 18 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 88 3:50 PM 91 1978 79 9 75  
MINIMUM 66 5:55 AM 37 1990 57 9 57  
AVERAGE 77 68 9 66  
 
PRECIPITATION (IN)  
TODAY 0.00 1.76 2003 0.15 -0.15 0.14  
MONTH TO DATE 3.04 2.33 0.71 1.48  
SINCE SEP 1 3.04 2.33 0.71 1.48  
SINCE JAN 1 27.63 31.55 -3.92 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 0  
MONTH TO DATE 0 10 -10 13  
SINCE SEP 1 0 10 -10 13  
SINCE JUL 1 0 11 -11 13  
 
COOLING  
TODAY 12 4 8 1  
MONTH TO DATE 140 116 24 117  
SINCE SEP 1 140 116 24 117  
SINCE JAN 1 1392 1172 220 1369    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 8 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 11 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 2.0  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 7:00 AM  
LOWEST 53 3:00 PM  
AVERAGE 75  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 78 93 1977  
1978  
MINIMUM TEMPERATURE (F) 57 36 1984  
 
SUNRISE AND SUNSET  
SEPTEMBER 18 2021.....SUNRISE 6:54 AM EDT SUNSET 7:13 PM EDT  
SEPTEMBER 19 2021.....SUNRISE 6:55 AM EDT SUNSET 7:11 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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