814  
CDUS41 KLWX 282124  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
423 PM EST FRI DEC 28 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 28 2018
 
 
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 51 359 PM 73 1984 43 8 23  
MINIMUM 42 839 AM 8 1966 25 17 9  
AVERAGE 47 34 13 16  
 
PRECIPITATION (IN)  
TODAY 1.08 1.74 1967 0.08 1.00 0.00  
MONTH TO DATE 5.23 2.73 2.50 0.74  
SINCE DEC 1 5.23 2.73 2.50 0.74  
SINCE JAN 1 66.21 41.31 24.90 40.63  
 
SNOWFALL (IN)  
TODAY MM 2.3 1993 0.2 MM  
MONTH TO DATE T 3.1 -3.1  
SINCE JUL 1 3.0 3.6 -0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 18 31 -13 49  
MONTH TO DATE 731 789 -58 791  
SINCE DEC 1 731 789 -58 791  
SINCE JUL 1 1689 1705 -16 1585  
 
COOLING  
TODAY 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 14 HIGHEST WIND DIRECTION SE (150)  
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION SE (150)  
AVERAGE WIND SPEED 3.3  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 100 AM  
LOWEST 93 200 PM  
AVERAGE 97  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 78 1984  
MINIMUM TEMPERATURE (F) 25 7 1977  
 
 
SUNRISE AND SUNSET  
DECEMBER 28 2018......SUNRISE 728 AM EST SUNSET 455 PM EST  
DECEMBER 29 2018......SUNRISE 728 AM EST SUNSET 456 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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