530  
CDUS41 KLWX 270524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
124 AM EDT MON SEP 27 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 26 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 75 4:13 PM 93 2007 75 0 74  
MINIMUM 53 11:53 PM 38 1964 54 -1 61  
1983  
AVERAGE 64 65 -1 68  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.15 1975 0.13 -0.13 0.01  
MONTH TO DATE 4.72 3.37 1.35 1.80  
SINCE SEP 1 4.72 3.37 1.35 1.80  
SINCE JAN 1 29.31 32.59 -3.28 36.02  
 
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 1 3 -2 0  
MONTH TO DATE 9 28 -19 58  
SINCE SEP 1 9 28 -19 58  
SINCE JUL 1 9 29 -20 58  
 
COOLING  
YESTERDAY 0 3 -3 3  
MONTH TO DATE 167 143 24 120  
SINCE SEP 1 167 143 24 120  
SINCE JAN 1 1419 1199 220 1372    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 22 HIGHEST WIND DIRECTION W (290)  
HIGHEST GUST SPEED 30 HIGHEST GUST DIRECTION W (290)  
AVERAGE WIND SPEED 7.3  
 
SKY COVER  
AVERAGE SKY COVER 0.2  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 80 5:00 AM  
LOWEST 34 5:00 PM  
AVERAGE 57  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 75 96 1998  
MINIMUM TEMPERATURE (F) 53 35 1984  
 
SUNRISE AND SUNSET  
SEPTEMBER 27 2021.....SUNRISE 7:02 AM EDT SUNSET 6:58 PM EDT  
SEPTEMBER 28 2021.....SUNRISE 7:03 AM EDT SUNSET 6:57 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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