Ooltewah, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.6 °C (low) to 21.7 °C (high). Annual precipitation averages 1528.3 Millimeters. Ooltewah is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.8 °C | 9.9 °C | 152.65 mm |
| February | 0.6 °C | 12.3 °C | 140.46 mm |
| March | 4.2 °C | 17.1 °C | 141.22 mm |
| April | 8.7 °C | 22.2 °C | 119.89 mm |
| May | 13.9 °C | 26.3 °C | 108.71 mm |
| June | 18.4 °C | 30 °C | 122.17 mm |
| July | 20.4 °C | 31.7 °C | 153.16 mm |
| August | 19.9 °C | 31.4 °C | 101.85 mm |
| September | 16.3 °C | 28.6 °C | 124.97 mm |
| October | 9.5 °C | 22.8 °C | 82.8 mm |
| November | 3.3 °C | 16.5 °C | 125.73 mm |
| December | 0.7 °C | 11.5 °C | 154.69 mm |
| Annual | 9.6 °C | 21.7 °C | 1528.3 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |