623  
CDUS41 KLWX 300528  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1227 AM EST SUN DEC 30 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 29 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 54 118 PM 78 1984 43 11 31  
MINIMUM 36 1159 PM 7 1977 25 11 10  
AVERAGE 45 34 11 21  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.27 2013 0.08 -0.08 0.00  
MONTH TO DATE 5.23 2.81 2.42 0.74  
SINCE DEC 1 5.23 2.81 2.42 0.74  
SINCE JAN 1 66.21 41.39 24.82 40.63  
 
SNOWFALL (IN)  
YESTERDAY 0.0 3.3 1962 0.1 -0.1  
MONTH TO DATE T 3.2 -3.2  
SINCE JUL 1 3.0 3.7 -0.7  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 20 31 -11 44  
MONTH TO DATE 751 820 -69 835  
SINCE DEC 1 751 820 -69 835  
SINCE JUL 1 1709 1736 -27 1629  
 
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 21 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 8.1  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
FOG W/VISIBILITY <= 1/4 MILE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 1200 AM  
LOWEST 46 100 PM  
AVERAGE 73  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 67 1990  
MINIMUM TEMPERATURE (F) 25 4 1963  
 
 
SUNRISE AND SUNSET  
DECEMBER 30 2018......SUNRISE 728 AM EST SUNSET 457 PM EST  
DECEMBER 31 2018......SUNRISE 728 AM EST SUNSET 457 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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