688  
CDUS41 KLWX 010529  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1229 AM EST TUE DEC 01 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR NOVEMBER 30 2020
 
 
CLIMATE NORMAL PERIOD: 1981 TO 2010  
CLIMATE RECORD PERIOD: 1960 TO 2020  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 62 12:13 PM 72 1991 51 11 44  
MINIMUM 47 11:59 PM 11 1976 31 16 38  
AVERAGE 55 41 14 41  
 
PRECIPITATION (IN)  
YESTERDAY 1.38R 1.31 2016 0.12 1.26 0.00  
MONTH TO DATE 3.61 3.41 0.20 1.62  
SINCE SEP 1 9.43 10.58 -1.15 8.00  
SINCE JAN 1 43.65 38.58 5.07 37.84  
 
SNOWFALL (IN)  
YESTERDAY 0.0 11.4 1967 0.0 0.0 0.0  
MONTH TO DATE 0.0 0.5 -0.5 T  
SINCE SEP 1 0.0 0.5 -0.5 T  
SINCE JUL 1 0.0 0.5 -0.5 T  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 10 24 -14 24  
MONTH TO DATE 400 559 -159 678  
SINCE SEP 1 667 913 -246 863  
SINCE JUL 1 667 915 -248 863  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 1 2 -1 0  
SINCE SEP 1 154 162 -8 289  
SINCE JAN 1 1406 1178 228 1524    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION NW (330)  
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED 6.9  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 10:00 AM  
LOWEST 63 11:00 PM  
AVERAGE 80  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 51 75 2006  
MINIMUM TEMPERATURE (F) 31 4 1967  
 
SUNRISE AND SUNSET  
DECEMBER 1 2020......SUNRISE 7:10 AM EST SUNSET 4:48 PM EST  
DECEMBER 2 2020......SUNRISE 7:11 AM EST SUNSET 4:48 PM EST  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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