792  
CDUS41 KLWX 300523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT THU SEP 30 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 29 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 73 3:11 PM 89 2019 74 -1 77  
MINIMUM 50 11:56 PM 34 1978 52 -2 55  
AVERAGE 62 63 -1 66  
 
PRECIPITATION (IN)  
YESTERDAY T 2.23 1963 0.14 -0.14 0.37  
MONTH TO DATE 4.72 3.79 0.93 2.17  
SINCE SEP 1 4.72 3.79 0.93 2.17  
SINCE JAN 1 29.31 33.01 -3.70 36.39  
 
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 3 4 -1 0  
MONTH TO DATE 12 39 -27 58  
SINCE SEP 1 12 39 -27 58  
SINCE JUL 1 12 40 -28 58  
 
COOLING  
YESTERDAY 0 2 -2 1  
MONTH TO DATE 171 149 22 135  
SINCE SEP 1 171 149 22 135  
SINCE JAN 1 1423 1205 218 1387    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION N (10)  
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION N (10)  
AVERAGE WIND SPEED 6.9  
 
SKY COVER  
AVERAGE SKY COVER 0.2  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 89 11:00 PM  
LOWEST 37 4:00 PM  
AVERAGE 63  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 74 92 1986  
MINIMUM TEMPERATURE (F) 52 35 1993  
 
SUNRISE AND SUNSET  
SEPTEMBER 30 2021.....SUNRISE 7:05 AM EDT SUNSET 6:54 PM EDT  
OCTOBER 1 2021.......SUNRISE 7:06 AM EDT SUNSET 6:52 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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