015  
CDUS41 KLWX 060525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
125 AM EDT MON SEP 06 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 5 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 75 4:55 PM 96 1985 83 -8 80  
MINIMUM 67 6:49 AM 42 1997 62 5 56  
AVERAGE 71 72 -1 68  
 
PRECIPITATION (IN)  
YESTERDAY 0.05 3.78 1979 0.12 -0.07 0.00  
MONTH TO DATE 1.98 0.61 1.37 0.28  
SINCE SEP 1 1.98 0.61 1.37 0.28  
SINCE JAN 1 26.57 29.83 -3.26 34.50  
 
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 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE SEP 1 0 0 0 0  
SINCE JUL 1 0 1 -1 0  
 
COOLING  
YESTERDAY 6 8 -2 3  
MONTH TO DATE 21 40 -19 53  
SINCE SEP 1 21 40 -19 53  
SINCE JAN 1 1273 1096 177 1305    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION S (160)  
AVERAGE WIND SPEED 3.8  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 8:00 PM  
LOWEST 76 9:00 AM  
AVERAGE 85  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 83 98 1983  
MINIMUM TEMPERATURE (F) 61 45 1972  
1976  
 
SUNRISE AND SUNSET  
SEPTEMBER 6 2021.....SUNRISE 6:43 AM EDT SUNSET 7:32 PM EDT  
SEPTEMBER 7 2021.....SUNRISE 6:44 AM EDT SUNSET 7:30 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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