829  
CDUS41 KLWX 180522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1222 AM EST MON JAN 18 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 17 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 47 1:19 PM 70 1990 42 5 36  
MINIMUM 28 2:11 AM -7 1982 24 4 24  
AVERAGE 38 33 5 30  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.14 1994 0.09 -0.09 T  
MONTH TO DATE 1.25 1.42 -0.17 1.47  
SINCE DEC 1 7.06 4.38 2.68 4.44  
SINCE JAN 1 1.25 1.42 -0.17 1.47  
 
SNOWFALL (IN)  
YESTERDAY 0.0 4.2 1965 0.3 -0.3 T  
MONTH TO DATE 0.0 3.5 -3.5 2.0  
SINCE DEC 1 2.4 7.0 -4.6 2.6  
SINCE JUL 1 2.4 7.5 -5.1 2.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 27 32 -5 35  
MONTH TO DATE 464 544 -80 384  
SINCE DEC 1 1266 1426 -160 1184  
SINCE JUL 1 1933 2342 -409 2047  
 
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 14 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION SW (220)  
AVERAGE WIND SPEED 7.9  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 72 2:00 AM  
LOWEST 47 3:00 PM  
AVERAGE 60  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 70 1990  
MINIMUM TEMPERATURE (F) 24 -1 1994  
 
SUNRISE AND SUNSET  
JANUARY 18 2021.......SUNRISE 7:26 AM EST SUNSET 5:15 PM EST  
JANUARY 19 2021.......SUNRISE 7:25 AM EST SUNSET 5:17 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