185  
CDUS41 KLWX 170524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
124 AM EDT SUN OCT 17 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 16 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 78 11:01 AM 85 1989 68 10 68  
MINIMUM 50 11:32 PM 30 1986 45 5 45  
AVERAGE 64 56 8 57  
 
PRECIPITATION (IN)  
YESTERDAY 0.46 1.10 2002 0.12 0.34 0.01  
MONTH TO DATE 0.49 1.93 -1.44 1.33  
SINCE SEP 1 5.21 5.87 -0.66 3.61  
SINCE JAN 1 29.80 35.09 -5.29 37.83  
 
SNOWFALL (IN)  
YESTERDAY 0.0 T 1977 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 1 9 -8 8  
MONTH TO DATE 6 108 -102 92  
SINCE SEP 1 23 153 -130 153  
SINCE JUL 1 23 154 -131 153  
 
COOLING  
YESTERDAY 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 (320)  
HIGHEST GUST SPEED 35 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED 10.0  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 3:00 PM  
LOWEST 61 1:00 PM  
AVERAGE 77  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 67 84 2016  
MINIMUM TEMPERATURE (F) 45 31 1981  
1982  
 
SUNRISE AND SUNSET  
OCTOBER 17 2021.......SUNRISE 7:22 AM EDT SUNSET 6:28 PM EDT  
OCTOBER 18 2021.......SUNRISE 7:23 AM EDT SUNSET 6:27 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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