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Weather April in Knoxville, United States of America Visitors to Knoxville during the month of April should plan on bringing a raincoat since it will be raining some days. The amount of rain is high with an average of 83mm (3.3in). The average maximum temperature lies around 16.0Â°C (60.8Â°F). This month is known as a chilly month.
The highest monthly average temperature in Chattanooga for August is 80 degrees. The lowest monthly average temperature in Chattanooga for January is 43 degrees. The most monthly precipitation in Chattanooga occurs in December with 5.6 inches. The air quality index in Chattanooga is 11% better than the national average. The pollution index in Chattanooga is 94% better than the national average.