813  
CDUS41 KLWX 111235  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
735 AM EST FRI JAN 11 2019  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 10 2019
 
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1960 TO 2019  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 35 239 PM 59 2016 42 -7 43  
MINIMUM 27 1142 PM 0 1982 24 3 20  
AVERAGE 31 33 -2 32  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.00 2016 0.08 -0.08 0.00  
MONTH TO DATE 0.25 0.81 -0.56 0.07  
SINCE DEC 1 6.01 3.77 2.24 0.84  
SINCE JAN 1 0.25 0.81 -0.56 0.07  
 
SNOWFALL (IN)  
YESTERDAY 0.0 6.2 1965 0.2 -0.2  
MONTH TO DATE T 1.8 -1.8  
SINCE JUL 1 3.0 5.8 -2.8  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 34 32 2 33  
MONTH TO DATE 237 320 -83 446  
SINCE DEC 1 1041 1202 -161 1369  
SINCE JUL 1 1999 2118 -119 2163  
 
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 35 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 48 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 20.9  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.5  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 57 1100 PM  
LOWEST 41 200 PM  
AVERAGE 49  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 71 1975  
MINIMUM TEMPERATURE (F) 24 -5 1988  
 
 
SUNRISE AND SUNSET  
JANUARY 11 2019.......SUNRISE 728 AM EST SUNSET 507 PM EST  
JANUARY 12 2019.......SUNRISE 728 AM EST SUNSET 508 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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