377  
CDUS41 KLWX 150529  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
128 AM EDT SAT SEP 15 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 14 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 77 354 PM 95 1998 80 -3 80  
MINIMUM 72 1159 PM 37 1985 57 15 65  
AVERAGE 75 69 6 73  
 
PRECIPITATION (IN)  
YESTERDAY T 5.52 1966 0.14 -0.14 0.03  
MONTH TO DATE 2.74 1.73 1.01 1.75  
SINCE SEP 1 2.74 1.73 1.01 1.75  
SINCE JAN 1 46.00 29.73 16.27 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 7 -3 30  
SINCE SEP 1 4 7 -3 30  
SINCE JUL 1 4 9 -5 31  
 
COOLING  
YESTERDAY 10 5 5 8  
MONTH TO DATE 149 92 57 34  
SINCE SEP 1 149 92 57 34  
SINCE JAN 1 1333 1108 225 1095    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION NE (60)  
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION E (70)  
AVERAGE WIND SPEED 9.2  
 
 
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 82 400 PM  
AVERAGE 91  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 80 95 1998  
1993  
MINIMUM TEMPERATURE (F) 57 38 1985  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 15 2018.....SUNRISE 651 AM EDT SUNSET 718 PM EDT  
SEPTEMBER 16 2018.....SUNRISE 652 AM EDT SUNSET 716 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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