190  
CDUS41 KLWX 040531  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
126 AM EDT TUE SEP 4 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 3 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 94 226 PM 96 1993 84 10 78  
MINIMUM 72 513 AM 45 1967 61 11 59  
AVERAGE 83 72 11 69  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.47 1969 0.12 -0.12 T  
MONTH TO DATE 0.44 0.35 0.09 0.66  
SINCE SEP 1 0.44 0.35 0.09 0.66  
SINCE JAN 1 43.70 28.35 15.35 33.66  
 
SNOWFALL (IN)  
YESTERDAY 0.0 MM MM 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0  
SINCE JUL 1 0.0 0.0 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 9  
SINCE SEP 1 0 0 0 9  
SINCE JUL 1 0 2 -2 10  
 
COOLING  
YESTERDAY 18 8 10 4  
MONTH TO DATE 46 24 22 4  
SINCE SEP 1 46 24 22 4  
SINCE JAN 1 1230 1040 190 1065    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 8 HIGHEST WIND DIRECTION SW (240)  
HIGHEST GUST SPEED 10 HIGHEST GUST DIRECTION W (260)  
AVERAGE WIND SPEED 1.5  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.3  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 100 AM  
LOWEST 52 300 PM  
AVERAGE 76  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 84 95 1985  
MINIMUM TEMPERATURE (F) 61 48 1997  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 4 2018.....SUNRISE 641 AM EDT SUNSET 735 PM EDT  
SEPTEMBER 5 2018.....SUNRISE 642 AM EDT SUNSET 734 PM EDT  
 
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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