244  
CDUS41 KLWX 010524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
124 AM EDT WED SEP 01 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 31 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 84 11:42 AM 98 1991 84 0 75  
MINIMUM 70 4:45 AM 43 1976 63 7 64  
AVERAGE 77 74 3 70  
 
PRECIPITATION (IN)  
YESTERDAY 0.02 3.21 1975 0.11 -0.09 0.55  
MONTH TO DATE 4.93 3.53 1.40 7.64  
SINCE JUN 1 11.01 11.98 -0.97 17.70  
SINCE JAN 1 24.59 29.22 -4.63 34.22  
 
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 JUN 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 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE JUN 1 6 13 -7 5  
SINCE JUL 1 0 0 0 0  
 
COOLING  
YESTERDAY 12 9 3 5  
MONTH TO DATE 429 334 95 401  
SINCE JUN 1 1143 950 193 1175  
SINCE JAN 1 1252 1056 196 1252    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 8 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 12 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 2.0  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 2:00 AM  
LOWEST 65 10:00 AM  
AVERAGE 81  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 84 98 1962  
1980  
MINIMUM TEMPERATURE (F) 63 49 1970  
1976  
 
SUNRISE AND SUNSET  
SEPTEMBER 1 2021.....SUNRISE 6:39 AM EDT SUNSET 7:40 PM EDT  
SEPTEMBER 2 2021.....SUNRISE 6:40 AM EDT SUNSET 7:38 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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