670  
CDUS41 KLWX 090522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1222 AM EST SAT JAN 09 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 8 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 39 2:02 PM 70 2008 42 -3 43  
MINIMUM 29 1:08 AM -4 1970 24 5 25  
AVERAGE 34 33 1 34  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.07 1978 0.08 -0.08 0.00  
MONTH TO DATE 1.14 0.65 0.49 1.00  
SINCE DEC 1 6.95 3.61 3.34 3.97  
SINCE JAN 1 1.14 0.65 0.49 1.00  
 
SNOWFALL (IN)  
YESTERDAY 0.0 4.7 1990 0.2 -0.2 0.0  
MONTH TO DATE 0.0 1.4 -1.4 2.0  
SINCE DEC 1 2.4 4.9 -2.5 2.6  
SINCE JUL 1 2.4 5.4 -3.0 2.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 31 32 -1 31  
MONTH TO DATE 214 256 -42 203  
SINCE DEC 1 1016 1138 -122 1003  
SINCE JUL 1 1683 2054 -371 1866  
 
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 13 HIGHEST WIND DIRECTION N (340)  
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED 6.9  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 78 6:00 AM  
LOWEST 54 2:00 PM  
AVERAGE 66  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 64 2008  
MINIMUM TEMPERATURE (F) 24 -8 1970  
 
SUNRISE AND SUNSET  
JANUARY 9 2021.......SUNRISE 7:28 AM EST SUNSET 5:06 PM EST  
JANUARY 10 2021.......SUNRISE 7:28 AM EST SUNSET 5:07 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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