623  
CDUS41 KLWX 232123  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
523 PM EDT WED SEP 23 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 23 2020
 
 
VALID TODAY AS OF 0500 PM LOCAL TIME.  
 
CLIMATE NORMAL PERIOD: 1981 TO 2010  
CLIMATE RECORD PERIOD: 1960 TO 2020  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
TODAY  
MAXIMUM 81 3:26 PM 94 2019 77 4 94  
MINIMUM 45 6:09 AM 33 1983 53 -8 68  
AVERAGE 63 65 -2 81  
 
PRECIPITATION (IN)  
TODAY 0.00 1.74 2003 0.13 -0.13 T  
MONTH TO DATE 1.48 3.00 -1.52 0.33  
SINCE SEP 1 1.48 3.00 -1.52 0.33  
SINCE JAN 1 35.70 31.00 4.70 30.17  
 
SNOWFALL (IN)  
TODAY 0.0 MM MM 0.0 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0 0.0  
SINCE SEP 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  
TODAY 2 3 -1 0  
MONTH TO DATE 55 27 28 5  
SINCE SEP 1 55 27 28 5  
SINCE JUL 1 55 29 26 5  
 
COOLING  
TODAY 0 3 -3 16  
MONTH TO DATE 117 126 -9 197  
SINCE SEP 1 117 126 -9 197  
SINCE JAN 1 1369 1142 227 1432    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 4.9  
 
SKY COVER  
AVERAGE SKY COVER 0.1  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 3:00 AM  
LOWEST 38 3:00 PM  
AVERAGE 66  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 76 97 2010  
MINIMUM TEMPERATURE (F) 53 30 1974  
 
SUNRISE AND SUNSET  
SEPTEMBER 23 2020.....SUNRISE 6:59 AM EDT SUNSET 7:04 PM EDT  
SEPTEMBER 24 2020.....SUNRISE 7:00 AM EDT SUNSET 7:03 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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