398  
CDUS41 KLWX 092128  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
428 PM EST SAT DEC 09 2023  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 9 2023
 
 
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 57 3:59 PM 72 1978 48 9 50  
MINIMUM 29 7:36 AM 11 1989 30 -1 29  
AVERAGE 43 39 4 40  
 
PRECIPITATION (IN)  
TODAY 0.00 1.12 1973 0.12 -0.12 0.00  
MONTH TO DATE 0.69 1.03 -0.34 0.40  
SINCE DEC 1 0.69 1.03 -0.34 0.40  
SINCE JAN 1 29.72 40.97 -11.25 36.21  
 
SNOWFALL (IN)  
TODAY 0.0 4.0 2017 0.1 -0.1 0.0  
MONTH TO DATE 0.0 0.7 -0.7 0.0  
SINCE DEC 1 0.0 0.7 -0.7 0.0  
SINCE JUL 1 T 1.0 -1.0 T  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 22 26 -4 25  
MONTH TO DATE 183 224 -41 204  
SINCE DEC 1 183 224 -41 204  
SINCE JUL 1 954 1124 -170 1038  
 
COOLING  
TODAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 1380 1231 149 1376    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 8 HIGHEST WIND DIRECTION S (180)  
HIGHEST GUST SPEED 11 HIGHEST GUST DIRECTION S (190)  
AVERAGE WIND SPEED 1.8  
 
SKY COVER  
AVERAGE SKY COVER 0.3  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 8:00 AM  
LOWEST 48 2:00 PM  
AVERAGE 70  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 48 70 1966  
MINIMUM TEMPERATURE (F) 30 4 1989  
 
SUNRISE AND SUNSET  
DECEMBER 9 2023......SUNRISE 7:17 AM EST SUNSET 4:47 PM EST  
DECEMBER 10 2023......SUNRISE 7:17 AM EST SUNSET 4:48 PM EST  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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