208  
CDUS41 KLWX 170522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
122 AM EDT FRI SEP 17 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 16 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 2:08 PM 97 1991 79 6 73  
MINIMUM 69 6:28 AM 37 1984 58 11 46  
AVERAGE 77 69 8 60  
 
PRECIPITATION (IN)  
YESTERDAY 0.61 2.05 1999 0.15 0.46 0.00  
MONTH TO DATE 3.04 2.04 1.00 1.16  
SINCE SEP 1 3.04 2.04 1.00 1.16  
SINCE JAN 1 27.63 31.26 -3.63 35.38  
 
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 1 -1 5  
MONTH TO DATE 0 7 -7 11  
SINCE SEP 1 0 7 -7 11  
SINCE JUL 1 0 8 -8 11  
 
COOLING  
YESTERDAY 12 5 7 0  
MONTH TO DATE 117 107 10 116  
SINCE SEP 1 117 107 10 116  
SINCE JAN 1 1369 1163 206 1368    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION E (110)  
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION E (110)  
AVERAGE WIND SPEED 4.7  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 8:00 PM  
LOWEST 63 2:00 PM  
AVERAGE 78  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 79 97 1991  
MINIMUM TEMPERATURE (F) 58 35 1986  
 
SUNRISE AND SUNSET  
SEPTEMBER 17 2021.....SUNRISE 6:53 AM EDT SUNSET 7:14 PM EDT  
SEPTEMBER 18 2021.....SUNRISE 6:54 AM EDT SUNSET 7:13 PM EDT  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab VA Page
The Nexlab MD Page
The Nexlab WV Page Main Text Page