204  
CDUS41 KLWX 010525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
125 AM EDT FRI OCT 01 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 30 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 74 3:55 PM 92 1986 74 0 71  
MINIMUM 45 5:56 AM 35 1993 52 -7 52  
AVERAGE 60 63 -3 62  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 4.74 2010 0.15 -0.15 0.11  
MONTH TO DATE 4.72 3.94 0.78 2.28  
SINCE SEP 1 4.72 3.94 0.78 2.28  
SINCE JAN 1 29.31 33.16 -3.85 36.50  
 
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 5 4 1 3  
MONTH TO DATE 17 43 -26 61  
SINCE SEP 1 17 43 -26 61  
SINCE JUL 1 17 44 -27 61  
 
COOLING  
YESTERDAY 0 2 -2 0  
MONTH TO DATE 171 152 19 135  
SINCE SEP 1 171 152 19 135  
SINCE JAN 1 1423 1208 215 1387    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 4.6  
 
SKY COVER  
AVERAGE SKY COVER 0.1  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 5:00 AM  
LOWEST 41 4:00 PM  
AVERAGE 69  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 73 90 1986  
MINIMUM TEMPERATURE (F) 52 31 1993  
 
SUNRISE AND SUNSET  
OCTOBER 1 2021.......SUNRISE 7:06 AM EDT SUNSET 6:52 PM EDT  
OCTOBER 2 2021.......SUNRISE 7:07 AM EDT SUNSET 6:50 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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