Climate & Weather in Knoxville
Knoxville has a humid subtropical climate (Köppen Cfa) typical of the Tennessee Valley -- genuine four seasons with a hot, humid July (average high 88°F) and a mild-but-real January (average high 47°F, average low 28°F), roughly 52 inches of precipitation spread fairly evenly year-round, and only about 5 inches of snow in a typical year, per NOAA's 1991-2020 climate normals.
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Learn moreA Real Four-Season Valley Climate
Per NOAA's official 1991-2020 climate normals (measured at Knoxville AP, station USW00013891), July -- Knoxville's hottest month -- averages a high of 88°F and a low of 67°F, while January -- the coldest -- averages a high of 47°F and a low of 28°F. Annual precipitation totals roughly 52 inches, fairly evenly distributed across the year, with snowfall averaging a modest 5 inches annually. This is a genuine humid subtropical (Köppen Cfa) climate: hot, humid summers and a real, if generally mild, winter.
Spring Severe-Thunderstorm Season, With a Real Comparative Tornado Advantage
As detailed on the flood-hurricane-risk topic page, spring is Knoxville's primary severe-thunderstorm and tornado season, but Knoxville's historical tornado frequency (176 recorded tornadoes 1950-2013) runs meaningfully lower than Nashville's (426) or Memphis's (390) over the same period -- a real, sourced comparative advantage within Tennessee, not a claim of zero risk. This lower baseline is worth knowing, especially for anyone comparing Knoxville against Middle or West Tennessee markets.
Occasional Winter Ice: A Real, If Modest, Hazard
While Knoxville's average annual snowfall is a modest 5 inches, the region -- like much of the Southern Appalachian foothills -- can see occasional winter ice events, particularly at higher elevations in the surrounding hills and mountains. This pass did not find a documented, headline Knoxville-specific ice-storm event on the scale of Atlanta's 2014 'Snowmageddon' (covered elsewhere in this project) -- that absence is disclosed as a research gap rather than treated as proof no such event has occurred.
Flash-Flood Risk Ties Directly to Rainfall Patterns
Knoxville's roughly 52 inches of fairly evenly distributed annual precipitation, combined with the region's hilly, karst terrain, is the underlying driver of the flash-flood and localized-drainage risk detailed on the flood-hurricane-risk topic page -- intense, concentrated rainfall events (rather than the total annual volume alone) are what overwhelm urban drainage systems and cause the flooding documented there.
Key takeaways
- Knoxville averages a 47°F high / 28°F low in January and an 88°F high / 67°F low in July, per NOAA's 1991-2020 climate normals -- a genuine four-season humid subtropical (Cfa) climate.
- Annual precipitation runs about 52 inches, fairly evenly distributed, with a modest 5 inches of snow in a typical year.
- Spring is Knoxville's primary severe-thunderstorm and tornado season, but Knoxville's historical tornado count (176, 1950-2013) runs meaningfully below Nashville's (426) or Memphis's (390) -- a real comparative advantage, not zero risk.
- Occasional winter ice is a real, if modest, regional hazard, especially at higher elevations nearby; no headline Knoxville-specific ice-storm event comparable to Atlanta's 2014 'Snowmageddon' was found this pass -- that gap is disclosed rather than assumed away.
- Knoxville's flash-flood risk (detailed on the flood-hurricane-risk page) is driven by intense, concentrated rainfall events interacting with hilly, karst terrain -- not by total annual precipitation volume alone.
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