736  
CDUS41 KLWX 192128  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
528 PM EDT SUN SEP 19 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 19 2021
 
 
VALID TODAY AS OF 0500 PM LOCAL TIME.  
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1960 TO 2021  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
TODAY  
MAXIMUM 80 3:56 PM 93 1977 78 2 66  
1978  
MINIMUM 68 1:07 AM 36 1984 57 11 43  
AVERAGE 74 68 6 55  
 
PRECIPITATION (IN)  
TODAY 0.00 1.26 2000 0.14 -0.14 0.00  
MONTH TO DATE 3.04 2.47 0.57 1.48  
SINCE SEP 1 3.04 2.47 0.57 1.48  
SINCE JAN 1 27.63 31.69 -4.06 35.70  
 
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 0 2 -2 10  
MONTH TO DATE 0 12 -12 23  
SINCE SEP 1 0 12 -12 23  
SINCE JUL 1 0 13 -13 23  
 
COOLING  
TODAY 9 4 5 0  
MONTH TO DATE 149 120 29 117  
SINCE SEP 1 149 120 29 117  
SINCE JAN 1 1401 1176 225 1369    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION N (20)  
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION NE (40)  
AVERAGE WIND SPEED 5.6  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 12:00 AM  
LOWEST 60 11:00 AM  
AVERAGE 78  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 78 91 1965  
MINIMUM TEMPERATURE (F) 56 40 1979  
 
SUNRISE AND SUNSET  
SEPTEMBER 19 2021.....SUNRISE 6:55 AM EDT SUNSET 7:11 PM EDT  
SEPTEMBER 20 2021.....SUNRISE 6:56 AM EDT SUNSET 7:10 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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