341  
CDUS41 KLWX 120526  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
126 AM EDT TUE OCT 12 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 11 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 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)  
YESTERDAY 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)  
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 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  
YESTERDAY 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 7.3  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 1:00 AM  
LOWEST 75 10:00 AM  
AVERAGE 84  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 69 83 1995  
2010  
MINIMUM TEMPERATURE (F) 47 25 1964  
 
SUNRISE AND SUNSET  
OCTOBER 12 2021.......SUNRISE 7:17 AM EDT SUNSET 6:35 PM EDT  
OCTOBER 13 2021.......SUNRISE 7:18 AM EDT SUNSET 6:34 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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