| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 7.4° | -1.5° | 140.3mm | 11.6 | 31 |
| February | 9.6° | 0.4° | 141.7mm | 11 | 42 |
| March | 14.6° | 4° | 141.3mm | 11.4 | 60 |
| April | 19.6° | 9° | 131mm | 10.5 | 78 |
| May | 23.2° | 14.3° | 110.5mm | 10.9 | 78 |
| June | 26.8° | 18.3° | 104.4mm | 10.7 | 79 |
| July | 28.4° | 20° | 115.5mm | 11.4 | 72 |
| August | 28.3° | 19.8° | 100.6mm | 10.2 | 74 |
| September | 25.1° | 16.7° | 129.9mm | 8.2 | 84 |
| October | 19.8° | 11° | 95.8mm | 7.6 | 84 |
| November | 13.8° | 4.8° | 115.7mm | 8.8 | 63 |
| December | 9.1° | 0.9° | 133.1mm | 10.9 | 42 |
January in Chattanooga averages a daily high of 7.4°C with nights around -1.5°C. Expect roughly 11.6 wet days totalling 140.3mm. A hard month to visit for comfort alone.
February in Chattanooga averages a daily high of 9.6°C with nights around 0.4°C. Expect roughly 11 wet days totalling 141.7mm. Demanding conditions — pack for it and plan indoor options.
March in Chattanooga averages a daily high of 14.6°C with nights around 4°C. Expect roughly 11.4 wet days totalling 141.3mm. Generally workable, with some weather to plan around.
April in Chattanooga averages a daily high of 19.6°C with nights around 9°C. Expect roughly 10.5 wet days totalling 131mm. Comfortable conditions for being outdoors all day.
May in Chattanooga averages a daily high of 23.2°C with nights around 14.3°C. Expect roughly 10.9 wet days totalling 110.5mm. Comfortable conditions for being outdoors all day.
June in Chattanooga averages a daily high of 26.8°C with nights around 18.3°C. Expect roughly 10.7 wet days totalling 104.4mm. Comfortable conditions for being outdoors all day.
July in Chattanooga averages a daily high of 28.4°C with nights around 20°C. Expect roughly 11.4 wet days totalling 115.5mm. Generally workable, with some weather to plan around.
August in Chattanooga averages a daily high of 28.3°C with nights around 19.8°C. Expect roughly 10.2 wet days totalling 100.6mm. Generally workable, with some weather to plan around.
September in Chattanooga averages a daily high of 25.1°C with nights around 16.7°C. Expect roughly 8.2 wet days totalling 129.9mm. Comfortable conditions for being outdoors all day.
October in Chattanooga averages a daily high of 19.8°C with nights around 11°C. Expect roughly 7.6 wet days totalling 95.8mm. Comfortable conditions for being outdoors all day.
November in Chattanooga averages a daily high of 13.8°C with nights around 4.8°C. Expect roughly 8.8 wet days totalling 115.7mm. Generally workable, with some weather to plan around.
December in Chattanooga averages a daily high of 9.1°C with nights around 0.9°C. Expect roughly 10.9 wet days totalling 133.1mm. Demanding conditions — pack for it and plan indoor options.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Chattanooga peaks at 84.
Based on 30 years of records, April–June scores highest for comfort in Chattanooga, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 28.4°C.
February is the wettest, averaging 141.7mm of rain across roughly 11 wet days.
January is the coolest month, with average daily highs around 7.4°C.