270  
CDUS41 KLWX 220529  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
128 AM EDT SAT SEP 22 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 21 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 76 457 PM 92 1998 77 -1 85  
1965  
MINIMUM 68 911 AM 33 1962 54 14 60  
AVERAGE 72 66 6 73  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.59 1979 0.13 -0.13 0.00  
MONTH TO DATE 3.80 2.74 1.06 1.75  
SINCE SEP 1 3.80 2.74 1.06 1.75  
SINCE JAN 1 47.06 30.74 16.32 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 3 -3 0  
MONTH TO DATE 4 21 -17 30  
SINCE SEP 1 4 21 -17 30  
SINCE JUL 1 4 23 -19 31  
 
COOLING  
YESTERDAY 7 3 4 8  
MONTH TO DATE 215 120 95 88  
SINCE SEP 1 215 120 95 88  
SINCE JAN 1 1399 1136 263 1149    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION S (160)  
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION S (180)  
AVERAGE WIND SPEED 9.3  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.8  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 900 AM  
LOWEST 82 400 PM  
AVERAGE 88  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 77 94 2010  
1980  
1970  
MINIMUM TEMPERATURE (F) 54 35 1962  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 22 2018.....SUNRISE 657 AM EDT SUNSET 707 PM EDT  
SEPTEMBER 23 2018.....SUNRISE 658 AM EDT SUNSET 705 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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