310  
CDUS41 KLWX 080528  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
128 AM EDT SAT SEP 8 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 7 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 87 338 PM 95 1985 83 4 72  
1983  
MINIMUM 72 1142 PM 41 1976 60 12 50  
AVERAGE 80 71 9 61  
 
PRECIPITATION (IN)  
YESTERDAY 0.20 1.11 2011 0.12 0.08 0.00  
MONTH TO DATE 0.64 0.82 -0.18 1.63  
SINCE SEP 1 0.64 0.82 -0.18 1.63  
SINCE JAN 1 43.90 28.82 15.08 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 0 0 4  
MONTH TO DATE 0 0 0 14  
SINCE SEP 1 0 0 0 14  
SINCE JUL 1 0 2 -2 15  
 
COOLING  
YESTERDAY 15 7 8 0  
MONTH TO DATE 114 53 61 19  
SINCE SEP 1 114 53 61 19  
SINCE JAN 1 1298 1069 229 1080    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION NE (30)  
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION N (20)  
AVERAGE WIND SPEED 5.8  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 800 PM  
LOWEST 61 1100 AM  
AVERAGE 81  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 82 96 2016  
MINIMUM TEMPERATURE (F) 60 43 1984  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 8 2018.....SUNRISE 645 AM EDT SUNSET 729 PM EDT  
SEPTEMBER 9 2018.....SUNRISE 646 AM EDT SUNSET 728 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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