287  
CDUS41 KLWX 230525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
125 AM EDT THU SEP 23 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 22 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 80 2:15 PM 94 1970 77 3 72  
1980  
2010  
MINIMUM 71 3:25 AM 35 1962 56 15 38  
AVERAGE 76 66 10 55  
 
PRECIPITATION (IN)  
YESTERDAY 0.25 1.57 1982 0.12 0.13 0.00  
MONTH TO DATE 3.29 2.86 0.43 1.48  
SINCE SEP 1 3.29 2.86 0.43 1.48  
SINCE JAN 1 27.88 32.08 -4.20 35.70  
 
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 2 -2 10  
MONTH TO DATE 0 18 -18 53  
SINCE SEP 1 0 18 -18 53  
SINCE JUL 1 0 19 -19 53  
 
COOLING  
YESTERDAY 11 3 8 0  
MONTH TO DATE 167 131 36 117  
SINCE SEP 1 167 131 36 117  
SINCE JAN 1 1419 1187 232 1369    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 24 HIGHEST WIND DIRECTION SE (150)  
HIGHEST GUST SPEED 35 HIGHEST GUST DIRECTION SE (150)  
AVERAGE WIND SPEED 11.8  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 94 7:00 AM  
LOWEST 74 1:00 PM  
AVERAGE 84  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 77 94 2019  
MINIMUM TEMPERATURE (F) 55 33 1983  
 
SUNRISE AND SUNSET  
SEPTEMBER 23 2021.....SUNRISE 6:59 AM EDT SUNSET 7:05 PM EDT  
SEPTEMBER 24 2021.....SUNRISE 7:00 AM EDT SUNSET 7:03 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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