503  
CDUS41 KLWX 150521  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1221 AM EST TUE DEC 15 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 14 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 44 4:59 AM 69 2015 46 -2 49  
MINIMUM 34 11:49 PM 3 1989 27 7 38  
AVERAGE 39 37 2 44  
 
PRECIPITATION (IN)  
YESTERDAY 1.24R 0.96 1999 0.10 1.14 0.32  
MONTH TO DATE 2.23 1.49 0.74 1.81  
SINCE DEC 1 2.23 1.49 0.74 1.81  
SINCE JAN 1 45.88 40.07 5.81 39.65  
 
SNOWFALL (IN)  
YESTERDAY 0.0 3.6 2003 0.2 -0.2 0.0  
MONTH TO DATE T 1.4 -1.4 0.2  
SINCE DEC 1 T 1.4 -1.4 0.2  
SINCE JUL 1 T 1.9 -1.9 0.2  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 26 28 -2 21  
MONTH TO DATE 322 368 -46 364  
SINCE DEC 1 322 368 -46 364  
SINCE JUL 1 989 1284 -295 1227  
 
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 25 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 34 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 9.0  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 8:00 AM  
LOWEST 56 11:00 PM  
AVERAGE 75  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 46 71 1971  
MINIMUM TEMPERATURE (F) 27 5 1989  
 
SUNRISE AND SUNSET  
DECEMBER 15 2020......SUNRISE 7:22 AM EST SUNSET 4:49 PM EST  
DECEMBER 16 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