895  
CDUS41 KLWX 120522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
122 AM EDT SUN SEP 12 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 11 2021
 
 
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)  
YESTERDAY  
MAXIMUM 79 4:44 PM 99 1983 81 -2 82  
MINIMUM 51 6:10 AM 40 1976 60 -9 71  
AVERAGE 65 70 -5 77  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.72 1987 0.13 -0.13 T  
MONTH TO DATE 2.43 1.35 1.08 1.16  
SINCE SEP 1 2.43 1.35 1.08 1.16  
SINCE JAN 1 27.02 30.57 -3.55 35.38  
 
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 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  
YESTERDAY 0 1 -1 0  
MONTH TO DATE 0 2 -2 0  
SINCE SEP 1 0 2 -2 0  
SINCE JUL 1 0 3 -3 0  
 
COOLING  
YESTERDAY 0 6 -6 12  
MONTH TO DATE 56 80 -24 103  
SINCE SEP 1 56 80 -24 103  
SINCE JAN 1 1308 1136 172 1355    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION SW (210)  
AVERAGE WIND SPEED 4.9  
 
SKY COVER  
AVERAGE SKY COVER 0.3  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 5:00 AM  
LOWEST 45 12:00 PM  
AVERAGE 71  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 81 95 1998  
2019  
MINIMUM TEMPERATURE (F) 60 40 1967  
 
SUNRISE AND SUNSET  
SEPTEMBER 12 2021.....SUNRISE 6:49 AM EDT SUNSET 7:22 PM EDT  
SEPTEMBER 13 2021.....SUNRISE 6:50 AM EDT SUNSET 7:21 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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