950  
CDUS41 KLWX 210532  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
131 AM EDT TUE AUG 21 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 20 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 79 431 PM 104 1983 87 -8 86  
MINIMUM 68 727 AM 47 1998 64 4 67  
1976  
1964  
AVERAGE 74 75 -1 77  
 
PRECIPITATION (IN)  
YESTERDAY T 2.17 1963 0.12 -0.12 0.00  
MONTH TO DATE 1.81 2.37 -0.56 3.12  
SINCE JUN 1 17.19 10.02 7.17 13.20  
SINCE JAN 1 37.84 26.84 11.00 32.29  
 
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 10 -1 12  
MONTH TO DATE 259 219 40 197  
SINCE JUN 1 867 819 48 856  
SINCE JAN 1 1059 911 148 993    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION SE (130)  
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION SE (130)  
AVERAGE WIND SPEED 7.2  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 300 AM  
LOWEST 74 200 PM  
AVERAGE 86  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 86 96 1962  
MINIMUM TEMPERATURE (F) 64 47 1976  
 
 
SUNRISE AND SUNSET  
AUGUST 21 2018........SUNRISE 629 AM EDT SUNSET 756 PM EDT  
AUGUST 22 2018........SUNRISE 630 AM EDT SUNSET 755 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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