881  
CDUS41 KLWX 140522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1222 AM EST MON DEC 14 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 13 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 65 1:13 PM 73 2015 46 19 38  
MINIMUM 39 11:03 PM 7 1988 28 11 33  
AVERAGE 52 37 15 36  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.47 1996 0.09 -0.09 0.25  
MONTH TO DATE 0.99 1.39 -0.40 1.49  
SINCE DEC 1 0.99 1.39 -0.40 1.49  
SINCE JAN 1 44.64 39.97 4.67 39.33  
 
SNOWFALL (IN)  
YESTERDAY 0.0 8.8 1966 0.1 -0.1 0.0  
MONTH TO DATE T 1.2 -1.2 0.2  
SINCE DEC 1 T 1.2 -1.2 0.2  
SINCE JUL 1 T 1.7 -1.7 0.2  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 13 28 -15 29  
MONTH TO DATE 296 340 -44 343  
SINCE DEC 1 296 340 -44 343  
SINCE JUL 1 963 1256 -293 1206  
 
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 15 HIGHEST WIND DIRECTION N (350)  
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION N (340)  
AVERAGE WIND SPEED 8.1  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 86 6:00 AM  
LOWEST 43 2:00 PM  
AVERAGE 65  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 46 69 2015  
MINIMUM TEMPERATURE (F) 27 3 1989  
 
SUNRISE AND SUNSET  
DECEMBER 14 2020......SUNRISE 7:21 AM EST SUNSET 4:48 PM EST  
DECEMBER 15 2020......SUNRISE 7:22 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.  
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab VA Page
The Nexlab MD Page
The Nexlab WV Page Main Text Page