914  
CDUS41 KLWX 310522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1222 AM EST THU DEC 31 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 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 47 11:59 PM 67 1990 43 4 63  
MINIMUM 26 12:08 AM 4 1963 25 1 45  
AVERAGE 37 34 3 54  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.87 1969 0.08 -0.08 0.18  
MONTH TO DATE 5.81 2.89 2.92 2.97  
SINCE DEC 1 5.81 2.89 2.92 2.97  
SINCE JAN 1 49.46 41.47 7.99 40.81  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.9 1977 0.2 -0.2 0.0  
MONTH TO DATE 2.4 3.4 -1.0 0.6  
SINCE DEC 1 2.4 3.4 -1.0 0.6  
SINCE JUL 1 2.4 3.9 -1.5 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 28 31 -3 11  
MONTH TO DATE 782 851 -69 782  
SINCE DEC 1 782 851 -69 782  
SINCE JUL 1 1449 1767 -318 1645  
 
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 21 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 32 HIGHEST GUST DIRECTION S (180)  
AVERAGE WIND SPEED 10.8  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 81 4:00 AM  
LOWEST 40 3:00 PM  
AVERAGE 61  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 73 1992  
MINIMUM TEMPERATURE (F) 24 1 1993  
 
SUNRISE AND SUNSET  
DECEMBER 31 2020......SUNRISE 7:28 AM EST SUNSET 4:58 PM EST  
JANUARY 1 2021.......SUNRISE 7:29 AM EST SUNSET 4:59 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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