492  
CDUS41 KLWX 182127  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
527 PM EDT MON OCT 18 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 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 70 2:30 PM 85 2016 67 3 65  
MINIMUM 41 2:29 AM 27 1976 44 -3 34  
1982  
AVERAGE 56 56 0 50  
 
PRECIPITATION (IN)  
TODAY 0.00 2.09 1996 0.12 -0.12 0.00  
MONTH TO DATE 0.49 2.16 -1.67 1.33  
SINCE SEP 1 5.21 6.10 -0.89 3.61  
SINCE JAN 1 29.80 35.32 -5.52 37.83  
 
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 9 10 -1 15  
MONTH TO DATE 24 127 -103 122  
SINCE SEP 1 41 172 -131 183  
SINCE JUL 1 41 173 -132 183  
 
COOLING  
TODAY 0 0 0 0  
MONTH TO DATE 52 19 33 4  
SINCE SEP 1 223 171 52 139  
SINCE JAN 1 1475 1227 248 1391    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 25 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 37 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 11.1  
 
SKY COVER  
AVERAGE SKY COVER 0.1  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 2:00 AM  
LOWEST 27 3:00 PM  
AVERAGE 60  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 67 87 2016  
MINIMUM TEMPERATURE (F) 44 25 1976  
 
SUNRISE AND SUNSET  
OCTOBER 18 2021.......SUNRISE 7:23 AM EDT SUNSET 6:27 PM EDT  
OCTOBER 19 2021.......SUNRISE 7:24 AM EDT SUNSET 6:25 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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