170  
CDUS41 KLWX 010526  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1225 AM EST FRI FEB 1 2019  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 31 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 22 507 PM 66 2012 44 -22 39  
MINIMUM -2 503 AM -7 1965 24 -26 15  
AVERAGE 10 34 -24 27  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.68 1985 0.10 -0.10 0.00  
MONTH TO DATE 3.94 2.68 1.26 1.79  
SINCE DEC 1 9.70 5.64 4.06 2.56  
SINCE JAN 1 3.94 2.68 1.26 1.79  
 
SNOWFALL (IN)  
YESTERDAY 0.0 4.7 1985 0.3 -0.3  
MONTH TO DATE 15.5 7.3 8.2  
SINCE JUL 1 18.5 11.3 7.2  
SNOW DEPTH 1  
 
DEGREE DAYS  
HEATING  
YESTERDAY 55 31 24 38  
MONTH TO DATE 1001 987 14 1003  
SINCE DEC 1 1805 1868 -63 1926  
SINCE JUL 1 2763 2784 -21 2720  
 
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 14 HIGHEST WIND DIRECTION SW (220)  
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION S (200)  
AVERAGE WIND SPEED 3.0  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.1  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 79 400 AM  
LOWEST 28 1200 PM  
AVERAGE 54  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 44 75 2002  
MINIMUM TEMPERATURE (F) 24 2 1965  
 
 
SUNRISE AND SUNSET  
FEBRUARY 1 2019......SUNRISE 716 AM EST SUNSET 531 PM EST  
FEBRUARY 2 2019......SUNRISE 715 AM EST SUNSET 532 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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