807  
CDUS41 KLWX 160524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1223 AM EST WED JAN 16 2019  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 15 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 37 357 PM 68 2007 42 -5 31  
MINIMUM 9 704 AM -7 1964 24 -15 11  
AVERAGE 23 33 -10 21  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.56 1995 0.09 -0.09 0.00  
MONTH TO DATE 1.13 1.25 -0.12 1.53  
SINCE DEC 1 6.89 4.21 2.68 2.30  
SINCE JAN 1 1.13 1.25 -0.12 1.53  
 
SNOWFALL (IN)  
YESTERDAY 0.0 1.4 1968 0.3 -0.3  
MONTH TO DATE 10.6 3.0 7.6  
SINCE JUL 1 13.6 7.0 6.6  
SNOW DEPTH 6  
 
DEGREE DAYS  
HEATING  
YESTERDAY 42 32 10 44  
MONTH TO DATE 426 480 -54 576  
SINCE DEC 1 1230 1362 -132 1499  
SINCE JUL 1 2188 2278 -90 2293  
 
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 15 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 3.6  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.2  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 900 AM  
LOWEST 59 500 PM  
AVERAGE 80  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 65 1974  
MINIMUM TEMPERATURE (F) 24 -4 1964  
 
 
SUNRISE AND SUNSET  
JANUARY 16 2019.......SUNRISE 727 AM EST SUNSET 513 PM EST  
JANUARY 17 2019.......SUNRISE 726 AM EST SUNSET 514 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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