625  
CDUS41 KLWX 222123  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
522 PM EDT TUE AUG 22 2017  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 22 2017
 
 
VALID TODAY AS OF 0500 PM LOCAL TIME.  
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1960 TO 2017  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
TODAY  
MAXIMUM 91 348 PM 101 1983 86 5 85  
MINIMUM 71 605 AM 51 1976 64 7 63  
1969  
AVERAGE 81 75 6 74  
 
PRECIPITATION (IN)  
TODAY 0.00 0.94 2009 0.10 -0.10 0.00  
MONTH TO DATE 3.12 2.57 0.55 0.94  
SINCE JUN 1 13.20 10.22 2.98 10.31  
SINCE JAN 1 32.29 27.04 5.25 27.98  
 
SNOWFALL (IN)  
TODAY 0.0 MM MM 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0  
SINCE JUL 1 T 0.0 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE JUN 1 6 15 -9 3  
SINCE JUL 1 0 0 0 0  
 
COOLING  
TODAY 16 10 6 9  
MONTH TO DATE 227 239 -12 331  
SINCE JUN 1 886 839 47 1043  
SINCE JAN 1 1023 931 92 1141    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION S (190)  
HIGHEST GUST SPEED 25 HIGHEST GUST DIRECTION S (190)  
AVERAGE WIND SPEED 6.8  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.3  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
THUNDERSTORM  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 100 AM  
LOWEST 56 100 PM  
AVERAGE 78  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 86 96 1998  
MINIMUM TEMPERATURE (F) 64 47 1981  
 
 
SUNRISE AND SUNSET  
AUGUST 22 2017........SUNRISE 630 AM EDT SUNSET 755 PM EDT  
AUGUST 23 2017........SUNRISE 631 AM EDT SUNSET 753 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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