686  
CDUS41 KLWX 300522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1222 AM EST WED DEC 30 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 29 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 42 12:04 AM 78 1984 43 -1 52  
MINIMUM 24 10:01 PM 7 1977 25 -1 40  
AVERAGE 33 34 -1 46  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.27 2013 0.08 -0.08 0.45  
MONTH TO DATE 5.81 2.81 3.00 2.79  
SINCE DEC 1 5.81 2.81 3.00 2.79  
SINCE JAN 1 49.46 41.39 8.07 40.63  
 
SNOWFALL (IN)  
YESTERDAY 0.0 3.3 1962 0.1 -0.1 0.0  
MONTH TO DATE 2.4 3.2 -0.8 0.6  
SINCE DEC 1 2.4 3.2 -0.8 0.6  
SINCE JUL 1 2.4 3.7 -1.3 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 32 31 1 19  
MONTH TO DATE 754 820 -66 771  
SINCE DEC 1 754 820 -66 771  
SINCE JUL 1 1421 1736 -315 1634  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 1406 1178 228 1524    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 22 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 32 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 10.3  
 
SKY COVER  
AVERAGE SKY COVER 0.3  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 74 10:00 PM  
LOWEST 31 2:00 PM  
AVERAGE 53  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 67 1990  
MINIMUM TEMPERATURE (F) 25 4 1963  
 
SUNRISE AND SUNSET  
DECEMBER 30 2020......SUNRISE 7:28 AM EST SUNSET 4:57 PM EST  
DECEMBER 31 2020......SUNRISE 7:28 AM EST SUNSET 4:58 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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