887  
CDUS41 KLWX 150522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1222 AM EST FRI JAN 15 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 14 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 56 3:22 PM 72 1995 42 14 48  
MINIMUM 24 3:43 AM 5 1970 24 0 38  
AVERAGE 40 33 7 43  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.79 2005 0.09 -0.09 0.08  
MONTH TO DATE 1.14 1.16 -0.02 1.47  
SINCE DEC 1 6.95 4.12 2.83 4.44  
SINCE JAN 1 1.14 1.16 -0.02 1.47  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.3 1978 0.2 -0.2 0.0  
MONTH TO DATE 0.0 2.7 -2.7 2.0  
SINCE DEC 1 2.4 6.2 -3.8 2.6  
SINCE JUL 1 2.4 6.7 -4.3 2.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 25 32 -7 22  
MONTH TO DATE 385 448 -63 313  
SINCE DEC 1 1187 1330 -143 1113  
SINCE JUL 1 1854 2246 -392 1976  
 
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 8 HIGHEST WIND DIRECTION N (350)  
HIGHEST GUST SPEED 13 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 2.5  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 7:00 AM  
LOWEST 32 3:00 PM  
AVERAGE 62  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 68 2007  
MINIMUM TEMPERATURE (F) 24 -7 1964  
 
SUNRISE AND SUNSET  
JANUARY 15 2021.......SUNRISE 7:27 AM EST SUNSET 5:12 PM EST  
JANUARY 16 2021.......SUNRISE 7:26 AM EST SUNSET 5:13 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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