555  
CDUS41 KLWX 280522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
122 AM EDT FRI SEP 28 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 27 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 70 1214 AM 96 1998 75 -5 89  
MINIMUM 55 251 PM 35 1984 51 4 68  
AVERAGE 63 63 0 79  
 
PRECIPITATION (IN)  
YESTERDAY 1.37 1.55 1985 0.13 1.24 0.00  
MONTH TO DATE 6.71 3.52 3.19 1.75  
SINCE SEP 1 6.71 3.52 3.19 1.75  
SINCE JAN 1 49.97 31.52 18.45 34.75  
 
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 2 4 -2 0  
MONTH TO DATE 13 41 -28 30  
SINCE SEP 1 13 41 -28 30  
SINCE JUL 1 13 43 -30 31  
 
COOLING  
YESTERDAY 0 2 -2 14  
MONTH TO DATE 238 135 103 149  
SINCE SEP 1 238 135 103 149  
SINCE JAN 1 1422 1151 271 1210    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION N (10)  
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION N (10)  
AVERAGE WIND SPEED 7.8  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 200 PM  
LOWEST 67 1100 AM  
AVERAGE 84  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 75 86 1998  
MINIMUM TEMPERATURE (F) 51 34 1989  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 28 2018.....SUNRISE 703 AM EDT SUNSET 657 PM EDT  
SEPTEMBER 29 2018.....SUNRISE 704 AM EDT SUNSET 656 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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