685  
CDUS41 KLWX 090523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT SAT OCT 09 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 8 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 76 2:34 PM 92 2007 71 5 71  
MINIMUM 59 6:42 AM 30 2001 48 11 45  
AVERAGE 68 60 8 58  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.79 2005 0.13 -0.13 0.00  
MONTH TO DATE T 1.01 -1.01 0.15  
SINCE SEP 1 4.72 4.95 -0.23 2.43  
SINCE JAN 1 29.31 34.17 -4.86 36.65  
 
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 7 -7 7  
MONTH TO DATE 5 44 -39 57  
SINCE SEP 1 22 89 -67 118  
SINCE JUL 1 22 90 -68 118  
 
COOLING  
YESTERDAY 3 1 2 0  
MONTH TO DATE 34 13 21 1  
SINCE SEP 1 205 165 40 136  
SINCE JAN 1 1457 1221 236 1388    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 8 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 11 HIGHEST GUST DIRECTION S (200)  
AVERAGE WIND SPEED 2.5  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 12:00 AM  
LOWEST 60 2:00 PM  
AVERAGE 77  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 70 94 2007  
MINIMUM TEMPERATURE (F) 48 26 2001  
 
SUNRISE AND SUNSET  
OCTOBER 9 2021.......SUNRISE 7:14 AM EDT SUNSET 6:40 PM EDT  
OCTOBER 10 2021.......SUNRISE 7:15 AM EDT SUNSET 6:38 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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