378  
CDUS41 KLWX 152129  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
529 PM EDT SAT SEP 15 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 15 2018
 
 
VALID TODAY AS OF 0500 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 81 350 PM 95 1998 80 1 82  
1993  
MINIMUM 69 555 AM 38 1985 57 12 62  
AVERAGE 75 68 7 72  
 
PRECIPITATION (IN)  
TODAY T 1.06 1981 0.15 -0.15 0.00  
MONTH TO DATE 2.74 1.88 0.86 1.75  
SINCE SEP 1 2.74 1.88 0.86 1.75  
SINCE JAN 1 46.00 29.88 16.12 34.75  
 
SNOWFALL (IN)  
TODAY 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  
TODAY 0 1 -1 0  
MONTH TO DATE 4 8 -4 30  
SINCE SEP 1 4 8 -4 30  
SINCE JUL 1 4 10 -6 31  
 
COOLING  
TODAY 10 5 5 7  
MONTH TO DATE 159 97 62 41  
SINCE SEP 1 159 97 62 41  
SINCE JAN 1 1343 1113 230 1102    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION NE (60)  
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION NE (50)  
AVERAGE WIND SPEED 8.4  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 1.0  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 100 AM  
LOWEST 69 400 PM  
AVERAGE 85  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 79 97 1991  
MINIMUM TEMPERATURE (F) 56 37 1984  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 15 2018.....SUNRISE 651 AM EDT SUNSET 718 PM EDT  
SEPTEMBER 16 2018.....SUNRISE 652 AM EDT SUNSET 716 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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