290  
CDUS41 KLWX 162140  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
440 PM EST WED DEC 16 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 16 2020
 
 
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 33 3:59 PM 72 1971 46 -13 37  
MINIMUM 27 12:04 AM 9 2016 27 0 32  
AVERAGE 30 36 -6 35  
 
PRECIPITATION (IN)  
TODAY 0.60 0.99 1974 0.10 0.50 0.46  
MONTH TO DATE 2.83 1.68 1.15 2.27  
SINCE DEC 1 2.83 1.68 1.15 2.27  
SINCE JAN 1 46.48 40.26 6.22 40.11  
 
SNOWFALL (IN)  
TODAY 2.2 5.2 1973 0.1 2.1 0.4  
MONTH TO DATE 2.2 1.6 0.6 0.6  
SINCE DEC 1 2.2 1.6 0.6 0.6  
SINCE JUL 1 2.2 2.1 0.1 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 35 29 6 30  
MONTH TO DATE 388 426 -38 415  
SINCE DEC 1 388 426 -38 415  
SINCE JUL 1 1055 1342 -287 1278  
 
COOLING  
TODAY 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 15 HIGHEST WIND DIRECTION NE (30)  
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION NE (30)  
AVERAGE WIND SPEED 7.9  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
HEAVY RAIN  
LT FREEZING RAIN  
HAIL  
SNOW  
LIGHT SNOW  
SLEET  
FOG  
HAZE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 12:00 PM  
LOWEST 63 9:00 AM  
AVERAGE 78  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 70 1984  
MINIMUM TEMPERATURE (F) 27 3 1989  
 
SUNRISE AND SUNSET  
DECEMBER 16 2020......SUNRISE 7:22 AM EST SUNSET 4:49 PM EST  
DECEMBER 17 2020......SUNRISE 7:23 AM EST SUNSET 4:49 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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