393  
CDUS41 KLWX 290532  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
132 AM EDT SAT JUL 29 2023  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JULY 28 2023
 
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1960 TO 2023  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 98 3:23 PM 99 1993 88 10 92  
MINIMUM 72 5:31 AM 47 1977 67 5 71  
AVERAGE 85 77 8 82  
 
PRECIPITATION (IN)  
YESTERDAY 0.04 1.65 2000 0.13 -0.09 0.24  
MONTH TO DATE 4.75 3.77 0.98 5.03  
SINCE JUN 1 7.05 8.07 -1.02 7.78  
SINCE JAN 1 17.03 25.31 -8.28 25.00  
 
SNOWFALL (IN)  
YESTERDAY 0.0 MM MM 0.0 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0 0.0  
SINCE JUN 1 0.0 0.0 0.0 0.0  
SINCE JUL 1 0.0 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 13 -8 0  
SINCE JUL 1 0 0 0 0  
 
COOLING  
YESTERDAY 20 12 8 17  
MONTH TO DATE 430 334 96 382  
SINCE JUN 1 612 572 40 619  
SINCE JAN 1 686 678 8 748    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION N (360)  
HIGHEST GUST SPEED 31 HIGHEST GUST DIRECTION SW (220)  
AVERAGE WIND SPEED 3.2  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
LIGHT RAIN  
FOG  
HAZE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 94 3:00 AM  
LOWEST 43 2:00 PM  
AVERAGE 69  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 88 103 2011  
MINIMUM TEMPERATURE (F) 67 52 2014  
 
SUNRISE AND SUNSET  
JULY 29 2023..........SUNRISE 6:08 AM EDT SUNSET 8:24 PM EDT  
JULY 30 2023..........SUNRISE 6:09 AM EDT SUNSET 8:23 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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