850  
CDUS41 KLWX 290521  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
121 AM EDT SAT SEP 29 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 28 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 75 509 PM 86 1998 75 0 79  
MINIMUM 56 614 AM 34 1989 51 5 62  
AVERAGE 66 63 3 71  
 
PRECIPITATION (IN)  
YESTERDAY 0.65 1.61 2004 0.13 0.52 0.00  
MONTH TO DATE 7.36 3.65 3.71 1.75  
SINCE SEP 1 7.36 3.65 3.71 1.75  
SINCE JAN 1 50.62 31.65 18.97 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 0 4 -4 0  
MONTH TO DATE 13 45 -32 30  
SINCE SEP 1 13 45 -32 30  
SINCE JUL 1 13 47 -34 31  
 
COOLING  
YESTERDAY 1 2 -1 6  
MONTH TO DATE 239 137 102 155  
SINCE SEP 1 239 137 102 155  
SINCE JAN 1 1423 1153 270 1216    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION N (340)  
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 5.1  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 1200 AM  
LOWEST 58 300 PM  
AVERAGE 79  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 74 85 1986  
1973  
MINIMUM TEMPERATURE (F) 50 34 1978  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 29 2018.....SUNRISE 704 AM EDT SUNSET 656 PM EDT  
SEPTEMBER 30 2018.....SUNRISE 705 AM EDT SUNSET 654 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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