867  
CDUS41 KLWX 112129  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
529 PM EDT MON OCT 11 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 11 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 69 3:16 PM 86 2010 70 -1 72  
MINIMUM 64 8:58 AM 28 1972 47 17 64  
AVERAGE 67 58 9 68  
 
PRECIPITATION (IN)  
TODAY 0.00 3.38 2013 0.12 -0.12 0.69  
MONTH TO DATE 0.03 1.36 -1.33 0.84  
SINCE SEP 1 4.75 5.30 -0.55 3.12  
SINCE JAN 1 29.34 34.52 -5.18 37.34  
 
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 8 -8 0  
MONTH TO DATE 5 66 -61 66  
SINCE SEP 1 22 111 -89 127  
SINCE JUL 1 22 112 -90 127  
 
COOLING  
TODAY 2 1 1 3  
MONTH TO DATE 41 16 25 4  
SINCE SEP 1 212 168 44 139  
SINCE JAN 1 1464 1224 240 1391    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION NE (30)  
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION N (20)  
AVERAGE WIND SPEED 8.2  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 1:00 AM  
LOWEST 75 10:00 AM  
AVERAGE 84  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 69 83 1995  
2010  
MINIMUM TEMPERATURE (F) 47 25 1964  
 
SUNRISE AND SUNSET  
OCTOBER 11 2021.......SUNRISE 7:16 AM EDT SUNSET 6:37 PM EDT  
OCTOBER 12 2021.......SUNRISE 7:17 AM EDT SUNSET 6:35 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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