527  
CDUS41 KLWX 292128  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
528 PM EDT WED SEP 29 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 29 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 73 3:11 PM 89 2019 74 -1 77  
MINIMUM 58 8:36 AM 34 1978 52 6 55  
AVERAGE 66 63 3 66  
 
PRECIPITATION (IN)  
TODAY 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)  
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 4 -4 0  
MONTH TO DATE 9 39 -30 58  
SINCE SEP 1 9 39 -30 58  
SINCE JUL 1 9 40 -31 58  
 
COOLING  
TODAY 1 2 -1 1  
MONTH TO DATE 172 149 23 135  
SINCE SEP 1 172 149 23 135  
SINCE JAN 1 1424 1205 219 1387    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION N (10)  
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION N (10)  
AVERAGE WIND SPEED 8.5  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 81 2:00 AM  
LOWEST 37 4:00 PM  
AVERAGE 59  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 74 92 1986  
MINIMUM TEMPERATURE (F) 52 35 1993  
 
SUNRISE AND SUNSET  
SEPTEMBER 29 2021.....SUNRISE 7:04 AM EDT SUNSET 6:55 PM EDT  
SEPTEMBER 30 2021.....SUNRISE 7:05 AM EDT SUNSET 6:54 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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