764  
CDUS41 KLWX 140528  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1228 AM EST THU JAN 14 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 13 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 51 3:45 PM 69 2005 42 9 50  
MINIMUM 22 7:35 AM -3 1977 24 -2 38  
1981  
AVERAGE 37 33 4 44  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.03 1964 0.08 -0.08 0.00  
MONTH TO DATE 1.14 1.07 0.07 1.39  
SINCE DEC 1 6.95 4.03 2.92 4.36  
SINCE JAN 1 1.14 1.07 0.07 1.39  
 
SNOWFALL (IN)  
YESTERDAY 0.0 7.7 2019 0.3 -0.3 0.0  
MONTH TO DATE 0.0 2.5 -2.5 2.0  
SINCE DEC 1 2.4 6.0 -3.6 2.6  
SINCE JUL 1 2.4 6.5 -4.1 2.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 28 32 -4 21  
MONTH TO DATE 360 416 -56 291  
SINCE DEC 1 1162 1298 -136 1091  
SINCE JUL 1 1829 2214 -385 1954  
 
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 S (190)  
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION S (190)  
AVERAGE WIND SPEED 2.5  
 
SKY COVER  
AVERAGE SKY COVER 0.1  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 8:00 AM  
LOWEST 38 3:00 PM  
AVERAGE 65  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 72 1995  
MINIMUM TEMPERATURE (F) 24 5 1970  
 
SUNRISE AND SUNSET  
JANUARY 14 2021.......SUNRISE 7:27 AM EST SUNSET 5:11 PM EST  
JANUARY 15 2021.......SUNRISE 7:27 AM EST SUNSET 5:12 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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