916  
CDUS41 KLWX 160521  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
121 AM EDT MON JUL 16 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JULY 15 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 88 1246 PM 98 1995 88 0 87  
MINIMUM 69 1135 PM 53 1987 66 3 69  
1981  
AVERAGE 79 77 2 78  
 
PRECIPITATION (IN)  
YESTERDAY T 1.01 2005 0.12 -0.12 0.00  
MONTH TO DATE 0.85 1.78 -0.93 3.89  
SINCE JUN 1 5.02 5.76 -0.74 5.17  
SINCE JAN 1 25.67 22.58 3.09 24.26  
 
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 14 12 2 13  
MONTH TO DATE 196 175 21 206  
SINCE JUN 1 437 412 25 462  
SINCE JAN 1 629 504 125 599    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION NE (30)  
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION N (20)  
AVERAGE WIND SPEED 5.0  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
LIGHT RAIN  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 1100 PM  
LOWEST 55 1200 PM  
AVERAGE 78  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 88 104 1988  
MINIMUM TEMPERATURE (F) 66 57 1991  
1967  
1966  
 
 
SUNRISE AND SUNSET  
JULY 16 2018..........SUNRISE 557 AM EDT SUNSET 834 PM EDT  
JULY 17 2018..........SUNRISE 558 AM EDT SUNSET 833 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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