165  
CDUS41 KLWX 110528  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
128 AM EDT MON OCT 11 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 10 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 72 4:25 PM 87 2017 70 2 74  
MINIMUM 64 5:57 AM 31 1972 48 16 55  
1978  
AVERAGE 68 59 9 65  
 
PRECIPITATION (IN)  
YESTERDAY 0.03 2.22 2013 0.11 -0.08 0.00  
MONTH TO DATE 0.03 1.24 -1.21 0.15  
SINCE SEP 1 4.75 5.18 -0.43 2.43  
SINCE JAN 1 29.34 34.40 -5.06 36.65  
 
SNOWFALL (IN)  
YESTERDAY 0.0 1.3 1979 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 0  
MONTH TO DATE 5 58 -53 66  
SINCE SEP 1 22 103 -81 127  
SINCE JUL 1 22 104 -82 127  
 
COOLING  
YESTERDAY 3 1 2 0  
MONTH TO DATE 39 15 24 1  
SINCE SEP 1 210 167 43 136  
SINCE JAN 1 1462 1223 239 1388    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION NE (30)  
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION NE (30)  
AVERAGE WIND SPEED 8.1  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 5:00 AM  
LOWEST 76 4:00 PM  
AVERAGE 86  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 70 86 2010  
MINIMUM TEMPERATURE (F) 47 28 1972  
 
SUNRISE AND SUNSET  
OCTOBER 11 2021.......SUNRISE 7:16 AM EDT SUNSET 6:37 PM EDT  
OCTOBER 12 2021.......SUNRISE 7:17 AM EDT SUNSET 6:35 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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