550  
CDUS41 KLWX 310529  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1228 AM EST THU JAN 31 2019  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 30 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 33 1236 PM 72 2013 43 -10 35  
MINIMUM 6 631 AM 2 1965 24 -18 20  
AVERAGE 20 34 -14 28  
 
PRECIPITATION (IN)  
YESTERDAY 0.01 2.00 2013 0.09 -0.08 T  
MONTH TO DATE 3.94 2.58 1.36 1.79  
SINCE DEC 1 9.70 5.54 4.16 2.56  
SINCE JAN 1 3.94 2.58 1.36 1.79  
 
SNOWFALL (IN)  
YESTERDAY 0.1 6.3 2000 0.3 -0.2  
MONTH TO DATE 15.5 7.0 8.5  
SINCE JUL 1 18.5 11.0 7.5  
SNOW DEPTH 2  
 
DEGREE DAYS  
HEATING  
YESTERDAY 45 31 14 37  
MONTH TO DATE 946 956 -10 965  
SINCE DEC 1 1750 1838 -88 1888  
SINCE JUL 1 2708 2754 -46 2682  
 
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 33 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 40 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 11.6  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.2  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT SNOW  
BLOWING SNOW  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 400 AM  
LOWEST 41 400 PM  
AVERAGE 67  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 44 66 2012  
MINIMUM TEMPERATURE (F) 24 -7 1965  
 
 
SUNRISE AND SUNSET  
JANUARY 31 2019.......SUNRISE 717 AM EST SUNSET 530 PM EST  
FEBRUARY 1 2019......SUNRISE 716 AM EST SUNSET 531 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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