383  
CDUS41 KLWX 210529  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1229 AM EST MON JAN 21 2019  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 20 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 40 935 AM 63 2006 42 -2 61  
MINIMUM 16 1159 PM -7 1985 24 -8 20  
AVERAGE 28 33 -5 41  
 
PRECIPITATION (IN)  
YESTERDAY 0.24 1.01 1979 0.09 0.15 0.00  
MONTH TO DATE 2.35 1.68 0.67 1.55  
SINCE DEC 1 8.11 4.64 3.47 2.32  
SINCE JAN 1 2.35 1.68 0.67 1.55  
 
SNOWFALL (IN)  
YESTERDAY 0.0 4.6 2000 0.3 -0.3  
MONTH TO DATE 12.4 4.3 8.1  
SINCE JUL 1 15.4 8.3 7.1  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 37 32 5 24  
MONTH TO DATE 593 640 -47 736  
SINCE DEC 1 1397 1522 -125 1659  
SINCE JUL 1 2355 2438 -83 2453  
 
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 37 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 49 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 19.0  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.8  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 1200 AM  
LOWEST 41 900 PM  
AVERAGE 71  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 63 2018  
MINIMUM TEMPERATURE (F) 24 -16 1984  
 
 
SUNRISE AND SUNSET  
JANUARY 21 2019.......SUNRISE 724 AM EST SUNSET 518 PM EST  
JANUARY 22 2019.......SUNRISE 724 AM EST SUNSET 519 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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