609  
CDUS41 KLWX 110530  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
130 AM EDT TUE SEP 11 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 10 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 68 326 PM 99 1983 82 -14 72  
MINIMUM 61 330 AM 43 1981 59 2 47  
AVERAGE 65 70 -5 60  
 
PRECIPITATION (IN)  
YESTERDAY 0.22 1.50 1968 0.12 0.10 0.00  
MONTH TO DATE 2.60 1.19 1.41 1.63  
SINCE SEP 1 2.60 1.19 1.41 1.63  
SINCE JAN 1 45.86 29.19 16.67 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 5  
MONTH TO DATE 4 3 1 26  
SINCE SEP 1 4 3 1 26  
SINCE JUL 1 4 5 -1 27  
 
COOLING  
YESTERDAY 0 6 -6 0  
MONTH TO DATE 115 71 44 19  
SINCE SEP 1 115 71 44 19  
SINCE JAN 1 1299 1087 212 1080    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION E (100)  
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION E (100)  
AVERAGE WIND SPEED 5.2  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 600 AM  
LOWEST 93 200 AM  
AVERAGE 97  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 81 99 1983  
MINIMUM TEMPERATURE (F) 58 40 1976  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 11 2018.....SUNRISE 648 AM EDT SUNSET 724 PM EDT  
SEPTEMBER 12 2018.....SUNRISE 648 AM EDT SUNSET 723 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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