275  
CDUS41 KLWX 220531  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
131 AM EDT WED SEP 22 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 21 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 81 11:58 AM 92 1965 77 4 68  
1998  
MINIMUM 61 1:45 AM 33 1962 56 5 41  
AVERAGE 71 67 4 55  
 
PRECIPITATION (IN)  
YESTERDAY T 2.59 1979 0.13 -0.13 0.00  
MONTH TO DATE 3.04 2.74 0.30 1.48  
SINCE SEP 1 3.04 2.74 0.30 1.48  
SINCE JAN 1 27.63 31.96 -4.33 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 16 -16 43  
SINCE SEP 1 0 16 -16 43  
SINCE JUL 1 0 17 -17 43  
 
COOLING  
YESTERDAY 6 4 2 0  
MONTH TO DATE 156 128 28 117  
SINCE SEP 1 156 128 28 117  
SINCE JAN 1 1408 1184 224 1369    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION SE (130)  
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION S (170)  
AVERAGE WIND SPEED 4.9  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 90 5:00 AM  
LOWEST 62 3:00 PM  
AVERAGE 76  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 77 94 1970  
1980  
2010  
MINIMUM TEMPERATURE (F) 56 35 1962  
 
SUNRISE AND SUNSET  
SEPTEMBER 22 2021.....SUNRISE 6:58 AM EDT SUNSET 7:06 PM EDT  
SEPTEMBER 23 2021.....SUNRISE 6:59 AM EDT SUNSET 7:05 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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