002  
CDUS41 KLWX 310527  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1227 AM EST MON DEC 31 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 30 2018
 
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1960 TO 2018  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 46 424 PM 67 1990 43 3 32  
MINIMUM 30 1144 PM 4 1963 25 5 19  
AVERAGE 38 34 4 26  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.87 1969 0.08 -0.08 0.03  
MONTH TO DATE 5.23 2.89 2.34 0.77  
SINCE DEC 1 5.23 2.89 2.34 0.77  
SINCE JAN 1 66.21 41.47 24.74 40.66  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.9 1977 0.2 -0.2  
MONTH TO DATE T 3.4 -3.4  
SINCE JUL 1 3.0 3.9 -0.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 27 31 -4 39  
MONTH TO DATE 778 851 -73 874  
SINCE DEC 1 778 851 -73 874  
SINCE JUL 1 1736 1767 -31 1668  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 1522 1178 344 1281    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION S (190)  
HIGHEST GUST SPEED 13 HIGHEST GUST DIRECTION S (190)  
AVERAGE WIND SPEED 2.8  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 700 AM  
LOWEST 60 200 PM  
AVERAGE 80  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 73 1992  
MINIMUM TEMPERATURE (F) 24 1 1993  
 
 
SUNRISE AND SUNSET  
DECEMBER 31 2018......SUNRISE 728 AM EST SUNSET 457 PM EST  
JANUARY 1 2019.......SUNRISE 729 AM EST SUNSET 458 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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