791  
CDUS41 KLWX 220523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT SUN JUL 22 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JULY 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 74 801 AM 101 1991 88 -14 93  
MINIMUM 62 1059 PM 48 1966 66 -4 73  
AVERAGE 68 77 -9 83  
 
PRECIPITATION (IN)  
YESTERDAY 5.02R 1.15 1973 0.11 4.91 0.00  
MONTH TO DATE 7.01 2.46 4.55 5.55  
SINCE JUN 1 11.18 6.44 4.74 6.83  
SINCE JAN 1 31.83 23.26 8.57 25.92  
 
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 3 12 -9 18  
MONTH TO DATE 258 247 11 301  
SINCE JUN 1 499 484 15 557  
SINCE JAN 1 691 576 115 694    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION N (360)  
HIGHEST GUST SPEED 32 HIGHEST GUST DIRECTION N (350)  
AVERAGE WIND SPEED 10.7  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 1200 PM  
LOWEST 73 1200 AM  
AVERAGE 87  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 88 105 2011  
MINIMUM TEMPERATURE (F) 66 50 1974  
 
 
SUNRISE AND SUNSET  
JULY 22 2018..........SUNRISE 602 AM EDT SUNSET 830 PM EDT  
JULY 23 2018..........SUNRISE 603 AM EDT SUNSET 829 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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