632  
CDUS41 KLWX 042127  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
527 PM EDT SAT SEP 04 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 4 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 79 3:59 PM 95 1985 83 -4 88  
MINIMUM 56 5:31 AM 48 1997 62 -6 65  
AVERAGE 68 73 -5 77  
 
PRECIPITATION (IN)  
TODAY 0.00 1.29 1996 0.12 -0.12 0.01  
MONTH TO DATE 1.93 0.49 1.44 0.28  
SINCE SEP 1 1.93 0.49 1.44 0.28  
SINCE JAN 1 26.52 29.71 -3.19 34.50  
 
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 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  
TODAY 3 8 -5 12  
MONTH TO DATE 15 32 -17 50  
SINCE SEP 1 15 32 -17 50  
SINCE JAN 1 1267 1088 179 1302    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION SW (210)  
AVERAGE WIND SPEED 2.4  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 5:00 AM  
LOWEST 50 2:00 PM  
AVERAGE 74  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 83 96 1985  
MINIMUM TEMPERATURE (F) 62 42 1997  
 
SUNRISE AND SUNSET  
SEPTEMBER 4 2021.....SUNRISE 6:42 AM EDT SUNSET 7:35 PM EDT  
SEPTEMBER 5 2021.....SUNRISE 6:42 AM EDT SUNSET 7:34 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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