081  
CDUS41 KLWX 310522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
122 AM EDT FRI AUG 31 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 30 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 89 350 PM 99 1991 85 4 78  
MINIMUM 72 1159 PM 41 1986 62 10 59  
AVERAGE 81 74 7 69  
 
PRECIPITATION (IN)  
YESTERDAY 0.78 1.21 1978 0.11 0.67 0.00  
MONTH TO DATE 5.31 3.43 1.88 3.83  
SINCE JUN 1 20.69 11.08 9.61 13.91  
SINCE JAN 1 41.34 27.90 13.44 33.00  
 
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 1  
SINCE JUN 1 5 15 -10 7  
SINCE JUL 1 0 0 0 1  
 
COOLING  
YESTERDAY 16 9 7 4  
MONTH TO DATE 369 314 55 258  
SINCE JUN 1 977 914 63 917  
SINCE JAN 1 1169 1006 163 1054    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION SE (150)  
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION N (350)  
AVERAGE WIND SPEED 4.9  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.6  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
HEAVY RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 500 AM  
LOWEST 51 1100 AM  
AVERAGE 76  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 85 98 1991  
MINIMUM TEMPERATURE (F) 62 43 1976  
 
 
SUNRISE AND SUNSET  
AUGUST 31 2018........SUNRISE 638 AM EDT SUNSET 742 PM EDT  
SEPTEMBER 1 2018.....SUNRISE 639 AM EDT SUNSET 740 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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