855  
CDUS41 KLWX 310524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
122 AM EDT TUE JUL 31 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JULY 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 77 1055 AM 98 1988 88 -11 82  
MINIMUM 67 503 AM 48 2014 66 1 57  
AVERAGE 72 77 -5 70  
 
PRECIPITATION (IN)  
YESTERDAY 1.29R 1.15 2015 0.13 1.16 0.00  
MONTH TO DATE 11.04 3.55 7.49 8.80  
SINCE JUN 1 15.21 7.53 7.68 10.08  
SINCE JAN 1 35.86 24.35 11.51 29.17  
 
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 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE JUN 1 5 15 -10 6  
SINCE JUL 1 0 0 0 0  
 
COOLING  
YESTERDAY 7 12 -5 5  
MONTH TO DATE 357 355 2 395  
SINCE JUN 1 598 592 6 651  
SINCE JAN 1 790 684 106 788    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION E (100)  
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION E (100)  
AVERAGE WIND SPEED 5.4  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.8  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 500 PM  
LOWEST 69 1200 PM  
AVERAGE 85  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 88 98 1999  
MINIMUM TEMPERATURE (F) 66 50 1997  
 
 
SUNRISE AND SUNSET  
JULY 31 2018..........SUNRISE 610 AM EDT SUNSET 822 PM EDT  
AUGUST 1 2018........SUNRISE 611 AM EDT SUNSET 821 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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