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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.
Tennessee Weather. Blountville, TN climate is warm during summer when temperatures tend to be in the 70's and very cold during winter when temperatures tend to be in the 30's.emperature variations between night and day tend to be moderate during summer with a difference that can reach 22 degrees Fahrenheit, and moderate during winter with an average difference of 21 degrees Fahrenheit. The annual average precipitation at Blountville is 41.33 Inches.