Climate & Weather in Chattanooga
Chattanooga has a humid subtropical climate typical of the Tennessee River Valley -- a real four-season climate with warm, humid summers (July averaging 87-88°F) and mild winters (January averaging a 49°F high / 33°F low), plus roughly 50 inches of precipitation spread fairly evenly across the year, a real, sourced factor behind the flood risk detailed on the flood-hurricane-risk topic page.
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Learn moreA Real Four-Season, Humid Subtropical Climate
July, the warmest month, averages a high around 87-88°F, per aggregated 2026 climate-data sources (Current Results, WeatherSpark, climate-data.org); January, the coldest month, averages a high near 49°F with lows around 33°F. Precipitation runs fairly consistent throughout the year, totaling roughly 50 inches annually -- a genuinely wetter annual total than many Sun Belt metros covered elsewhere in this project, and a direct, sourced contributor to the river and flash-flood risk detailed on the flood-hurricane-risk topic page.
Severe Thunderstorm and Tornado Season
Spring is Chattanooga's primary severe-thunderstorm and tornado season, consistent with the flood-hurricane-risk topic page's disclosure of the April 27, 2011 EF4 Ringgold-Apison tornado (part of that year's Super Outbreak) and the March 2025 tornado line that tracked through the area. Peak tornado hours in Hamilton County specifically run late afternoon into early evening (roughly 3-7 PM), per tornado-tracking aggregator data, with nighttime tornadoes rare but especially dangerous when they occur.
Not a Hurricane Climate -- and No Documented Tropical-Remnant Impact Confirmed This Pass
Unlike coastal or even some inland Southeastern metros covered elsewhere in this project (e.g., Atlanta, which does receive documented secondary wind/rain impact from weakened tropical-system remnants), no comparable, specifically documented tropical-storm-remnant rainfall or wind event for Chattanooga was confirmed during this research pass. This gap is disclosed rather than assumed to mean zero risk -- Chattanooga's deep inland position makes such secondary impact plausible in principle, but this page does not claim a documented instance it could not verify.
Winter Weather: Generally Mild, With No Specific Major Ice-Storm Event Confirmed This Pass
Chattanooga's winters run genuinely mild on average (a 49°F average January high), and unlike Atlanta's well-documented 2014 "Snowmageddon" ice event covered elsewhere in this project, no comparably well-documented, named major Chattanooga-specific winter ice-storm event was confirmed during this research pass. This absence is disclosed as a research gap rather than either invented or assumed to mean Chattanooga carries zero winter-weather risk -- occasional winter precipitation and ice are plausible in a Tennessee Valley climate, but this page does not repeat an unconfirmed specific-event claim.
Key takeaways
- Chattanooga averages a 87-88°F July high and a 49°F/33°F January high/low, per aggregated 2026 climate-data sources -- a real four-season humid subtropical climate with roughly 50 inches of precipitation annually, spread fairly evenly across the year.
- Spring is Chattanooga's primary severe-thunderstorm and tornado season, consistent with the documented April 27, 2011 EF4 tornado and the March 2025 tornado line covered on the flood-hurricane-risk topic page; peak tornado hours run roughly 3-7 PM.
- No documented tropical-storm-remnant wind/rain event specific to Chattanooga was confirmed this research pass (unlike Atlanta, covered elsewhere in this project) -- disclosed as a gap, not evidence of zero risk.
- No specific, well-documented major winter ice-storm event comparable to Atlanta's 2014 'Snowmageddon' was confirmed for Chattanooga this pass -- also disclosed as a research gap rather than invented or dismissed.
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