806  
CDUS41 KLWX 010525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
122 AM EDT SAT SEP 1 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 31 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 89 215 PM 98 1991 85 4 84  
MINIMUM 71 954 PM 43 1976 62 9 60  
AVERAGE 80 73 7 72  
 
PRECIPITATION (IN)  
YESTERDAY 1.92 3.21 1975 0.10 1.82 0.00  
MONTH TO DATE 7.23 3.53 3.70 3.83  
SINCE JUN 1 22.61 11.18 11.43 13.91  
SINCE JAN 1 43.26 28.00 15.26 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 17 -12 7  
SINCE JUL 1 0 2 -2 1  
 
COOLING  
YESTERDAY 15 8 7 7  
MONTH TO DATE 384 324 60 265  
SINCE JUN 1 992 924 68 924  
SINCE JAN 1 1184 1016 168 1061    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION E (110)  
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION E (100)  
AVERAGE WIND SPEED 4.8  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 400 AM  
LOWEST 61 200 PM  
AVERAGE 81  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 84 98 1980  
1962  
MINIMUM TEMPERATURE (F) 62 49 1976  
1970  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 1 2018.....SUNRISE 639 AM EDT SUNSET 740 PM EDT  
SEPTEMBER 2 2018.....SUNRISE 640 AM EDT SUNSET 739 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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