Ooltewah, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.3 °F (low) to 71.1 °F (high). Annual precipitation averages 60.2 Inches. 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 | 30.5 °F | 49.9 °F | 6.01 in. |
| February | 33.0 °F | 54.2 °F | 5.53 in. |
| March | 39.6 °F | 62.7 °F | 5.56 in. |
| April | 47.7 °F | 72.0 °F | 4.72 in. |
| May | 57.1 °F | 79.4 °F | 4.28 in. |
| June | 65.2 °F | 86.0 °F | 4.81 in. |
| July | 68.8 °F | 89.1 °F | 6.03 in. |
| August | 67.8 °F | 88.6 °F | 4.01 in. |
| September | 61.4 °F | 83.5 °F | 4.92 in. |
| October | 49.1 °F | 73.1 °F | 3.26 in. |
| November | 38.0 °F | 61.7 °F | 4.95 in. |
| December | 33.3 °F | 52.7 °F | 6.09 in. |
| Annual | 49.3 °F | 71.1 °F | 60.17 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |