140  
CDUS41 KLWX 040534  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
134 AM EDT SAT SEP 04 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 3 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 79 3:58 PM 96 1993 84 -5 91  
MINIMUM 52 5:19 AM 45 1967 62 -10 69  
AVERAGE 66 73 -7 80  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.47 1969 0.13 -0.13 0.09  
MONTH TO DATE 1.93 0.37 1.56 0.27  
SINCE SEP 1 1.93 0.37 1.56 0.27  
SINCE JAN 1 26.52 29.59 -3.07 34.49  
 
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 1 8 -7 15  
MONTH TO DATE 12 24 -12 38  
SINCE SEP 1 12 24 -12 38  
SINCE JAN 1 1264 1080 184 1290    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 5.5  
 
SKY COVER  
AVERAGE SKY COVER 0.2  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 84 12:00 AM  
LOWEST 40 4:00 PM  
AVERAGE 62  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 83 95 1985  
MINIMUM TEMPERATURE (F) 62 48 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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