354  
CDUS41 KLWX 070527  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
127 AM EDT TUE SEP 07 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 6 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 85 3:57 PM 98 1983 83 2 83  
MINIMUM 62 11:29 PM 45 1972 61 1 55  
1976  
AVERAGE 74 72 2 69  
 
PRECIPITATION (IN)  
YESTERDAY 0.01 5.11 2008 0.12 -0.11 0.00  
MONTH TO DATE 1.99 0.73 1.26 0.28  
SINCE SEP 1 1.99 0.73 1.26 0.28  
SINCE JAN 1 26.58 29.95 -3.37 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 9 7 2 4  
MONTH TO DATE 30 47 -17 57  
SINCE SEP 1 30 47 -17 57  
SINCE JAN 1 1282 1103 179 1309    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION W (280)  
HIGHEST GUST SPEED 26 HIGHEST GUST DIRECTION W (290)  
AVERAGE WIND SPEED 6.7  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 12:00 AM  
LOWEST 37 2:00 PM  
AVERAGE 65  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 82 95 1983  
1985  
MINIMUM TEMPERATURE (F) 61 41 1976  
 
SUNRISE AND SUNSET  
SEPTEMBER 7 2021.....SUNRISE 6:44 AM EDT SUNSET 7:30 PM EDT  
SEPTEMBER 8 2021.....SUNRISE 6:45 AM EDT SUNSET 7:29 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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