Knoxville averages 31.6 days a year above 90°F, with December the wettest month at 5.91 in of normal rain. The hottest day on record was 105°F on Jul 1, 2012; the coldest, −20°F on Jan 21, 1985. The single biggest 24-hour rain event recorded was 6.66 in on Sep 18, 2012.
Climate and Average Weather Year Round in Knoxville
Year-round temperature
In Knoxville, the warmest months are June through September, with average daily highs between 83°F and 88°F. The coldest stretch runs December through February, with highs between 48°F and 53°F and overnight lows reaching 26°F.
Rainfall through the year
Rainfall in Knoxville averages 4.7 in per month over the long run. December is the wettest at 5.9 in, while October is the driest at 3.0 in.
Days at 90 °F or hotter
Knoxville averages 31.6 days per year at 90 °F or hotter. The hottest year on record saw 93 such days (2016); the coolest just 5 (2004).