167  
CDUS41 KLWX 200522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
122 AM EDT WED OCT 20 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 19 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 3:02 PM 87 2016 67 7 72  
MINIMUM 39 6:39 AM 25 1976 44 -5 49  
AVERAGE 57 55 2 61  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.36 1966 0.12 -0.12 T  
MONTH TO DATE 0.49 2.28 -1.79 1.33  
SINCE SEP 1 5.21 6.22 -1.01 3.61  
SINCE JAN 1 29.80 35.44 -5.64 37.83  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.1 1972 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 8 10 -2 4  
MONTH TO DATE 32 137 -105 126  
SINCE SEP 1 49 182 -133 187  
SINCE JUL 1 49 183 -134 187  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 52 19 33 4  
SINCE SEP 1 223 171 52 139  
SINCE JAN 1 1475 1227 248 1391    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION W (290)  
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION W (270)  
AVERAGE WIND SPEED 4.7  
 
SKY COVER  
AVERAGE SKY COVER 0.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 89 3:00 AM  
LOWEST 33 4:00 PM  
AVERAGE 61  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 66 83 1969  
2016  
MINIMUM TEMPERATURE (F) 44 20 1972  
 
SUNRISE AND SUNSET  
OCTOBER 20 2021.......SUNRISE 7:25 AM EDT SUNSET 6:24 PM EDT  
OCTOBER 21 2021.......SUNRISE 7:26 AM EDT SUNSET 6:22 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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