095  
CDUS41 KLWX 120531  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
129 AM EDT WED SEP 12 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 11 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 72 341 PM 99 1983 81 -9 72  
MINIMUM 66 443 AM 40 1976 58 8 49  
AVERAGE 69 70 -1 61  
 
PRECIPITATION (IN)  
YESTERDAY 0.12 0.72 1987 0.13 -0.01 0.00  
MONTH TO DATE 2.72 1.32 1.40 1.63  
SINCE SEP 1 2.72 1.32 1.40 1.63  
SINCE JAN 1 45.98 29.32 16.66 34.63  
 
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 4  
MONTH TO DATE 4 4 0 30  
SINCE SEP 1 4 4 0 30  
SINCE JUL 1 4 6 -2 31  
 
COOLING  
YESTERDAY 4 6 -2 0  
MONTH TO DATE 119 77 42 19  
SINCE SEP 1 119 77 42 19  
SINCE JAN 1 1303 1093 210 1080    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION N (350)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION N (360)  
AVERAGE WIND SPEED 6.4  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 1.0  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
FOG W/VISIBILITY <= 1/4 MILE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 1200 AM  
LOWEST 90 200 PM  
AVERAGE 95  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 81 95 1998  
MINIMUM TEMPERATURE (F) 58 40 1967  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 12 2018.....SUNRISE 648 AM EDT SUNSET 723 PM EDT  
SEPTEMBER 13 2018.....SUNRISE 649 AM EDT SUNSET 721 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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