830  
CDUS41 KLWX 120530  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
129 AM EDT THU JUL 12 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JULY 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 91 242 PM 98 1988 88 3 89  
MINIMUM 70 349 AM 52 1983 66 4 68  
AVERAGE 81 77 4 79  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 3.71 2013 0.12 -0.12 0.01  
MONTH TO DATE 0.85 1.31 -0.46 3.16  
SINCE JUN 1 5.02 5.29 -0.27 4.44  
SINCE JAN 1 25.67 22.11 3.56 23.53  
 
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 0  
MONTH TO DATE 0 0 0 0  
SINCE JUN 1 5 15 -10 6  
SINCE JUL 1 0 0 0 0  
 
COOLING  
YESTERDAY 16 12 4 14  
MONTH TO DATE 148 127 21 140  
SINCE JUN 1 389 364 25 396  
SINCE JAN 1 581 456 125 533    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION N (360)  
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION N (350)  
AVERAGE WIND SPEED 7.6  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.6  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 84 100 AM  
LOWEST 37 1100 AM  
AVERAGE 61  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 88 97 1986  
MINIMUM TEMPERATURE (F) 66 47 2002  
 
 
SUNRISE AND SUNSET  
JULY 12 2018..........SUNRISE 555 AM EDT SUNSET 836 PM EDT  
JULY 13 2018..........SUNRISE 555 AM EDT SUNSET 836 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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