807  
CDUS41 KLWX 140524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
122 AM EDT FRI SEP 14 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 13 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 79 456 PM 94 1974 81 -2 78  
MINIMUM 71 341 AM 43 1985 58 13 62  
AVERAGE 75 69 6 70  
 
PRECIPITATION (IN)  
YESTERDAY 0.02 0.68 1983 0.14 -0.12 0.09  
MONTH TO DATE 2.74 1.59 1.15 1.72  
SINCE SEP 1 2.74 1.59 1.15 1.72  
SINCE JAN 1 46.00 29.59 16.41 34.72  
 
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 1 -1 0  
MONTH TO DATE 4 6 -2 30  
SINCE SEP 1 4 6 -2 30  
SINCE JUL 1 4 8 -4 31  
 
COOLING  
YESTERDAY 10 5 5 5  
MONTH TO DATE 139 87 52 26  
SINCE SEP 1 139 87 52 26  
SINCE JAN 1 1323 1103 220 1087    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION E (70)  
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION NE (60)  
AVERAGE WIND SPEED 8.0  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 1200 AM  
LOWEST 85 100 PM  
AVERAGE 93  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 80 95 1998  
MINIMUM TEMPERATURE (F) 57 37 1985  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 14 2018.....SUNRISE 650 AM EDT SUNSET 720 PM EDT  
SEPTEMBER 15 2018.....SUNRISE 651 AM EDT SUNSET 718 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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