672  
CDUS41 KLWX 200530  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
129 AM EDT FRI JUL 20 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JULY 19 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 86 329 PM 98 1977 88 -2 93  
MINIMUM 61 345 AM 53 1976 66 -5 70  
AVERAGE 74 77 -3 82  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.52 1968 0.11 -0.11 0.00  
MONTH TO DATE 1.99 2.24 -0.25 5.55  
SINCE JUN 1 6.16 6.22 -0.06 6.83  
SINCE JAN 1 26.81 23.04 3.77 25.92  
 
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 9 12 -3 17  
MONTH TO DATE 245 223 22 265  
SINCE JUN 1 486 460 26 521  
SINCE JAN 1 678 552 126 658    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION S (200)  
AVERAGE WIND SPEED 3.7  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.5  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 200 AM  
LOWEST 37 400 PM  
AVERAGE 65  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 88 101 1980  
MINIMUM TEMPERATURE (F) 66 55 1974  
 
 
SUNRISE AND SUNSET  
JULY 20 2018..........SUNRISE 600 AM EDT SUNSET 831 PM EDT  
JULY 21 2018..........SUNRISE 601 AM EDT SUNSET 831 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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