773  
CDUS41 KLWX 130529  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
129 AM EDT WED OCT 13 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 12 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 71 12:57 PM 83 1995 69 2 65  
2010  
MINIMUM 61 7:49 PM 25 1964 47 14 55  
AVERAGE 66 58 8 60  
 
PRECIPITATION (IN)  
YESTERDAY T 0.78 1990 0.11 -0.11 0.48  
MONTH TO DATE 0.03 1.47 -1.44 1.32  
SINCE SEP 1 4.75 5.41 -0.66 3.60  
SINCE JAN 1 29.34 34.63 -5.29 37.82  
 
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 5  
MONTH TO DATE 5 74 -69 71  
SINCE SEP 1 22 119 -97 132  
SINCE JUL 1 22 120 -98 132  
 
COOLING  
YESTERDAY 1 1 0 0  
MONTH TO DATE 42 17 25 4  
SINCE SEP 1 213 169 44 139  
SINCE JAN 1 1465 1225 240 1391    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 8 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 10 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 2.8  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 9:00 PM  
LOWEST 73 12:00 PM  
AVERAGE 85  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 69 84 1989  
MINIMUM TEMPERATURE (F) 46 30 1987  
1988  
2012  
 
SUNRISE AND SUNSET  
OCTOBER 13 2021.......SUNRISE 7:18 AM EDT SUNSET 6:34 PM EDT  
OCTOBER 14 2021.......SUNRISE 7:19 AM EDT SUNSET 6:32 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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