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Chattanooga, Tennessee climate
Cfa Humid subtropical
Chattanooga has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 91°F, while the coldest is January averaging around 32°F at night. Precipitation is fairly even year-round, totalling about 55 inches. Snow is occasional (4 inches of snow per year on average).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsChattanooga climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 51 | 56 | 64 | 74 | 81 | 88 | 91 | 90 | 84 | 74 | 62 | 53 |
| Avg temp (°F) | 42 | 46 | 53 | 62 | 70 | 77 | 81 | 80 | 74 | 63 | 51 | 44 |
| Avg low (°F) | 32 | 36 | 42 | 50 | 59 | 67 | 71 | 70 | 64 | 51 | 40 | 35 |
| Precipitation (in) | 5.0 | 5.0 | 5.3 | 4.9 | 3.9 | 4.2 | 5.1 | 3.7 | 4.2 | 3.6 | 4.8 | 5.3 |
| Snowfall (in) | 1.0 | 1.2 | 1.1 | — | — | — | — | — | — | — | — | 0.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 51 | 56 | 64 | 74 | 81 | 88 |
| Avg temp (°F) | 42 | 46 | 53 | 62 | 70 | 77 |
| Avg low (°F) | 32 | 36 | 42 | 50 | 59 | 67 |
| Precipitation (in) | 5.0 | 5.0 | 5.3 | 4.9 | 3.9 | 4.2 |
| Snowfall (in) | 1.0 | 1.2 | 1.1 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 91 | 90 | 84 | 74 | 62 | 53 |
| Avg temp (°F) | 81 | 80 | 74 | 63 | 51 | 44 |
| Avg low (°F) | 71 | 70 | 64 | 51 | 40 | 35 |
| Precipitation (in) | 5.1 | 3.7 | 4.2 | 3.6 | 4.8 | 5.3 |
| Snowfall (in) | — | — | — | — | — | 0.3 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 11 | 11 | 10 | 11 | 11 | 12 | 9 | 8 | 8 | 9 | 11 |
| Days with high ≥ 90°F (days) | — | — | — | 0.1 | 3 | 12 | 19 | 17 | 7 | 0.4 | — | — |
| Days with low ≤ 32°F (days) | 17 | 12 | 5 | 0.4 | — | — | — | — | — | 0.3 | 7 | 15 |
| Days with snowfall ≥ 1 in (days) | 0.2 | 0.3 | 0.1 | — | — | — | — | — | — | — | — | 0.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 11 | 11 | 10 | 11 | 11 |
| Days with high ≥ 90°F (days) | — | — | — | 0.1 | 3 | 12 |
| Days with low ≤ 32°F (days) | 17 | 12 | 5 | 0.4 | — | — |
| Days with snowfall ≥ 1 in (days) | 0.2 | 0.3 | 0.1 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 12 | 9 | 8 | 8 | 9 | 11 |
| Days with high ≥ 90°F (days) | 19 | 17 | 7 | 0.4 | — | — |
| Days with low ≤ 32°F (days) | — | — | — | 0.3 | 7 | 15 |
| Days with snowfall ≥ 1 in (days) | — | — | — | — | — | 0.1 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 67 | 70 | 65 | 60 | 60 | 57 | 57 | 53 | 50 | 49 | 56 | 66 |
| Clear days (≤ 30% cloud) | 5 | 4 | 6 | 7 | 7 | 7 | 6 | 8 | 10 | 11 | 9 | 5 |
| Partly cloudy days (30–70%) | 10 | 8 | 9 | 9 | 10 | 11 | 13 | 12 | 9 | 10 | 9 | 9 |
| Cloudy days (≥ 70%) | 17 | 16 | 16 | 14 | 14 | 12 | 12 | 10 | 10 | 10 | 13 | 17 |
| Relative humidity (%) | 84 | 83 | 81 | 79 | 78 | 74 | 71 | 69 | 69 | 72 | 77 | 84 |
| Wind speed (mph) | 1.2 | 1.4 | 1.3 | 1.2 | 1.0 | 0.9 | 0.9 | 0.9 | 1.0 | 1.1 | 1.1 | 1.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 67 | 70 | 65 | 60 | 60 | 57 |
| Clear days (≤ 30% cloud) | 5 | 4 | 6 | 7 | 7 | 7 |
| Partly cloudy days (30–70%) | 10 | 8 | 9 | 9 | 10 | 11 |
| Cloudy days (≥ 70%) | 17 | 16 | 16 | 14 | 14 | 12 |
| Relative humidity (%) | 84 | 83 | 81 | 79 | 78 | 74 |
| Wind speed (mph) | 1.2 | 1.4 | 1.3 | 1.2 | 1.0 | 0.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 53 | 50 | 49 | 56 | 66 |
| Clear days (≤ 30% cloud) | 6 | 8 | 10 | 11 | 9 | 5 |
| Partly cloudy days (30–70%) | 13 | 12 | 9 | 10 | 9 | 9 |
| Cloudy days (≥ 70%) | 12 | 10 | 10 | 10 | 13 | 17 |
| Relative humidity (%) | 71 | 69 | 69 | 72 | 77 | 84 |
| Wind speed (mph) | 0.9 | 0.9 | 1.0 | 1.1 | 1.1 | 1.1 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Chattanooga AP (NOAA GHCN station USW00013882), about 10 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.