659  
CDUS41 KLWX 040526  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1226 AM EST MON JAN 04 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 3 2021
 
 
CLIMATE NORMAL PERIOD: 1981 TO 2010  
CLIMATE RECORD PERIOD: 1960 TO 2021  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 42 3:42 AM 68 2000 42 0 53  
MINIMUM 34 11:59 PM 1 2018 24 10 45  
AVERAGE 38 33 5 49  
 
PRECIPITATION (IN)  
YESTERDAY 0.30 1.37 1999 0.07 0.23 0.33  
MONTH TO DATE 1.13 0.23 0.90 0.33  
SINCE DEC 1 6.94 3.19 3.75 3.30  
SINCE JAN 1 1.13 0.23 0.90 0.33  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.9 1989 0.2 -0.2 0.0  
MONTH TO DATE 0.0 0.5 -0.5 0.0  
SINCE DEC 1 2.4 4.0 -1.6 0.6  
SINCE JUL 1 2.4 4.5 -2.1 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 27 32 -5 16  
MONTH TO DATE 74 96 -22 71  
SINCE DEC 1 876 978 -102 871  
SINCE JUL 1 1543 1894 -351 1734  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 0 0 0 0    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 4.9  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 1:00 PM  
LOWEST 79 12:00 AM  
AVERAGE 88  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 74 1997  
MINIMUM TEMPERATURE (F) 24 5 1979  
 
SUNRISE AND SUNSET  
JANUARY 4 2021.......SUNRISE 7:29 AM EST SUNSET 5:01 PM EST  
JANUARY 5 2021.......SUNRISE 7:29 AM EST SUNSET 5:02 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