123  
CDUS41 KLWX 072127  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
526 PM EDT FRI SEP 7 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 7 2018
 
 
VALID TODAY AS OF 0500 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 87 338 PM 95 1985 83 4 72  
1983  
MINIMUM 73 615 AM 41 1976 60 13 50  
AVERAGE 80 71 9 61  
 
PRECIPITATION (IN)  
TODAY 0.00 1.11 2011 0.12 -0.12 0.00  
MONTH TO DATE 0.44 0.82 -0.38 1.63  
SINCE SEP 1 0.44 0.82 -0.38 1.63  
SINCE JAN 1 43.70 28.82 14.88 34.63  
 
SNOWFALL (IN)  
TODAY 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  
TODAY 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  
TODAY 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 10 HIGHEST WIND DIRECTION N (360)  
HIGHEST GUST SPEED 13 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 5.8  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 87 400 AM  
LOWEST 61 1100 AM  
AVERAGE 74  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 82 96 2016  
MINIMUM TEMPERATURE (F) 60 43 1984  
 
 
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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