836  
CDUS41 KLWX 040527  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1226 AM EST FRI JAN 4 2019  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 3 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 49 1101 AM 68 2000 42 7 32  
MINIMUM 30 1153 PM 1 2018 24 6 1  
AVERAGE 40 33 7 17  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.37 1999 0.07 -0.07 0.00  
MONTH TO DATE 0.00 0.23 -0.23 0.00  
SINCE DEC 1 5.76 3.19 2.57 0.77  
SINCE JAN 1 0.00 0.23 -0.23 0.00  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.9 1989 0.2 -0.2  
MONTH TO DATE 0.0 0.5 -0.5  
SINCE JUL 1 3.0 4.5 -1.5  
SNOW DEPTH MM  
 
DEGREE DAYS  
HEATING  
YESTERDAY 25 32 -7 48  
MONTH TO DATE 63 96 -33 147  
SINCE DEC 1 867 978 -111 1070  
SINCE JUL 1 1825 1894 -69 1864  
 
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 21 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 5.0  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.8  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 800 AM  
LOWEST 50 200 PM  
AVERAGE 75  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 74 1997  
MINIMUM TEMPERATURE (F) 24 5 1979  
 
 
SUNRISE AND SUNSET  
JANUARY 4 2019.......SUNRISE 729 AM EST SUNSET 501 PM EST  
JANUARY 5 2019.......SUNRISE 729 AM EST SUNSET 502 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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