694  
CDUS41 KLWX 120523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1223 AM EST TUE JAN 12 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 11 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 3:24 PM 71 1975 42 0 70  
MINIMUM 22 3:44 AM -5 1988 24 -2 48  
AVERAGE 32 33 -1 59  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.90 1991 0.09 -0.09 0.01  
MONTH TO DATE 1.14 0.90 0.24 1.01  
SINCE DEC 1 6.95 3.86 3.09 3.98  
SINCE JAN 1 1.14 0.90 0.24 1.01  
 
SNOWFALL (IN)  
YESTERDAY 0.0 2.2 1991 0.2 -0.2 0.0  
MONTH TO DATE 0.0 2.0 -2.0 2.0  
SINCE DEC 1 2.4 5.5 -3.1 2.6  
SINCE JUL 1 2.4 6.0 -3.6 2.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 33 32 1 6  
MONTH TO DATE 302 352 -50 262  
SINCE DEC 1 1104 1234 -130 1062  
SINCE JUL 1 1771 2150 -379 1925  
 
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 7 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 9 HIGHEST GUST DIRECTION S (200)  
AVERAGE WIND SPEED 1.1  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 5:00 AM  
LOWEST 53 3:00 PM  
AVERAGE 73  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 70 2017  
2018  
MINIMUM TEMPERATURE (F) 24 -4 1977  
 
SUNRISE AND SUNSET  
JANUARY 12 2021.......SUNRISE 7:28 AM EST SUNSET 5:09 PM EST  
JANUARY 13 2021.......SUNRISE 7:28 AM EST SUNSET 5:10 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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