315  
CDUS41 KLWX 100533  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
133 AM EDT SUN OCT 10 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 9 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 73 12:15 PM 94 2007 70 3 71  
MINIMUM 61 6:02 AM 26 2001 48 13 41  
AVERAGE 67 59 8 56  
 
PRECIPITATION (IN)  
YESTERDAY T 2.53 1976 0.12 -0.12 0.00  
MONTH TO DATE T 1.13 -1.13 0.15  
SINCE SEP 1 4.72 5.07 -0.35 2.43  
SINCE JAN 1 29.31 34.29 -4.98 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 9  
MONTH TO DATE 5 51 -46 66  
SINCE SEP 1 22 96 -74 127  
SINCE JUL 1 22 97 -75 127  
 
COOLING  
YESTERDAY 2 1 1 0  
MONTH TO DATE 36 14 22 1  
SINCE SEP 1 207 166 41 136  
SINCE JAN 1 1459 1222 237 1388    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION E (70)  
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION E (70)  
AVERAGE WIND SPEED 5.7  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 6:00 AM  
LOWEST 64 12:00 PM  
AVERAGE 79  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 70 87 2017  
MINIMUM TEMPERATURE (F) 48 31 1972  
1978  
 
SUNRISE AND SUNSET  
OCTOBER 10 2021.......SUNRISE 7:15 AM EDT SUNSET 6:38 PM EDT  
OCTOBER 11 2021.......SUNRISE 7:16 AM EDT SUNSET 6:37 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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