434  
CDUS41 KLWX 080528  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1226 AM EST SAT DEC 8 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 7 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 40 339 PM 77 1998 49 -9 49  
MINIMUM 23 1159 PM 1 2002 29 -6 30  
AVERAGE 32 39 -7 40  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.14 2011 0.11 -0.11 0.00  
MONTH TO DATE 0.32 0.77 -0.45 0.13  
SINCE DEC 1 0.32 0.77 -0.45 0.13  
SINCE JAN 1 61.30 39.35 21.95 40.02  
 
SNOWFALL (IN)  
YESTERDAY 0.0 1.6 1969 0.1 -0.1  
MONTH TO DATE T 0.6 -0.6  
SINCE JUL 1 3.0 1.1 1.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 33 26 7 25  
MONTH TO DATE 183 176 7 154  
SINCE DEC 1 183 176 7 154  
SINCE JUL 1 1141 1092 49 948  
 
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 (330)  
HIGHEST GUST SPEED 26 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 7.3  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.4  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 85 300 AM  
LOWEST 40 1200 PM  
AVERAGE 63  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 48 76 1980  
MINIMUM TEMPERATURE (F) 29 13 2002  
 
 
SUNRISE AND SUNSET  
DECEMBER 8 2018......SUNRISE 716 AM EST SUNSET 447 PM EST  
DECEMBER 9 2018......SUNRISE 717 AM EST SUNSET 447 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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