625  
CDUS41 KLWX 010522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
122 AM EDT MON OCT 1 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 30 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 75 354 PM 92 1986 74 1 67  
MINIMUM 54 443 AM 35 1993 50 4 51  
AVERAGE 65 62 3 59  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 4.74 2010 0.14 -0.14 0.00  
MONTH TO DATE 7.36 3.92 3.44 1.75  
SINCE SEP 1 7.36 3.92 3.44 1.75  
SINCE JAN 1 50.62 31.92 18.70 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 5 -5 6  
MONTH TO DATE 13 55 -42 40  
SINCE SEP 1 13 56 -43 40  
SINCE JUL 1 13 58 -45 41  
 
COOLING  
YESTERDAY 0 2 -2 0  
MONTH TO DATE 241 141 100 155  
SINCE SEP 1 241 141 100 155  
SINCE JAN 1 1425 1157 268 1216    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION SW (210)  
AVERAGE WIND SPEED 3.5  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.4  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 300 AM  
LOWEST 53 1100 AM  
AVERAGE 77  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 73 90 1986  
MINIMUM TEMPERATURE (F) 50 31 1993  
 
 
SUNRISE AND SUNSET  
OCTOBER 1 2018.......SUNRISE 706 AM EDT SUNSET 652 PM EDT  
OCTOBER 2 2018.......SUNRISE 707 AM EDT SUNSET 651 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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