085  
CDUS41 KLWX 160528  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
127 AM EDT SUN SEP 16 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 15 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 81 350 PM 95 1998 80 1 82  
1993  
MINIMUM 69 555 AM 38 1985 57 12 62  
AVERAGE 75 68 7 72  
 
PRECIPITATION (IN)  
YESTERDAY T 1.06 1981 0.15 -0.15 0.00  
MONTH TO DATE 2.74 1.88 0.86 1.75  
SINCE SEP 1 2.74 1.88 0.86 1.75  
SINCE JAN 1 46.00 29.88 16.12 34.75  
 
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 1 -1 0  
MONTH TO DATE 4 8 -4 30  
SINCE SEP 1 4 8 -4 30  
SINCE JUL 1 4 10 -6 31  
 
COOLING  
YESTERDAY 10 5 5 7  
MONTH TO DATE 159 97 62 41  
SINCE SEP 1 159 97 62 41  
SINCE JAN 1 1343 1113 230 1102    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION E (70)  
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION E (70)  
AVERAGE WIND SPEED 7.5  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 100 AM  
LOWEST 69 400 PM  
AVERAGE 85  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 79 97 1991  
MINIMUM TEMPERATURE (F) 56 37 1984  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 16 2018.....SUNRISE 652 AM EDT SUNSET 716 PM EDT  
SEPTEMBER 17 2018.....SUNRISE 653 AM EDT SUNSET 715 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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