015  
CDUS41 KLWX 010531  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1231 AM EST FRI JAN 01 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 31 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 51 10:42 AM 73 1992 43 8 53  
MINIMUM 39 11:59 PM 1 1993 24 15 41  
AVERAGE 45 34 11 47  
 
PRECIPITATION (IN)  
YESTERDAY T 1.90 1975 0.07 -0.07 T  
MONTH TO DATE 5.81 2.96 2.85 2.97  
SINCE DEC 1 5.81 2.96 2.85 2.97  
SINCE JAN 1 49.46 41.54 7.92 40.81  
 
SNOWFALL (IN)  
YESTERDAY 0.0 8.5 1970 0.1 -0.1 0.0  
MONTH TO DATE 2.4 3.5 -1.1 0.6  
SINCE DEC 1 2.4 3.5 -1.1 0.6  
SINCE JUL 1 2.4 4.0 -1.6 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 20 31 -11 18  
MONTH TO DATE 802 882 -80 800  
SINCE DEC 1 802 882 -80 800  
SINCE JUL 1 1469 1798 -329 1663  
 
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 24 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 33 HIGHEST GUST DIRECTION S (190)  
AVERAGE WIND SPEED 9.8  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 82 8:00 AM  
LOWEST 56 1:00 PM  
AVERAGE 69  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 68 2005  
MINIMUM TEMPERATURE (F) 24 -6 1968  
 
SUNRISE AND SUNSET  
JANUARY 1 2021.......SUNRISE 7:29 AM EST SUNSET 4:59 PM EST  
JANUARY 2 2021.......SUNRISE 7:29 AM EST SUNSET 5:00 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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