453  
CDUS41 KLWX 070534  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
126 AM EDT FRI SEP 7 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 6 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 94 327 PM 98 1983 83 11 68  
MINIMUM 72 614 AM 45 1976 60 12 59  
1972  
AVERAGE 83 72 11 64  
 
PRECIPITATION (IN)  
YESTERDAY T 5.11 2008 0.11 -0.11 0.65  
MONTH TO DATE 0.44 0.70 -0.26 1.63  
SINCE SEP 1 0.44 0.70 -0.26 1.63  
SINCE JAN 1 43.70 28.70 15.00 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 1  
MONTH TO DATE 0 0 0 10  
SINCE SEP 1 0 0 0 10  
SINCE JUL 1 0 2 -2 11  
 
COOLING  
YESTERDAY 18 7 11 0  
MONTH TO DATE 99 46 53 19  
SINCE SEP 1 99 46 53 19  
SINCE JAN 1 1283 1062 221 1080    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION N (350)  
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION N (350)  
AVERAGE WIND SPEED 3.8  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.2  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 200 AM  
LOWEST 52 1200 PM  
AVERAGE 76  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 83 95 1985  
1983  
MINIMUM TEMPERATURE (F) 60 41 1976  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 7 2018.....SUNRISE 644 AM EDT SUNSET 731 PM EDT  
SEPTEMBER 8 2018.....SUNRISE 645 AM EDT SUNSET 729 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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