Rainbow City, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.3 °F (low) to 73.2 °F (high). Annual precipitation averages 57.9 Inches. Rainbow City 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 | 31.4 °F | 52.7 °F | 5.63 in. |
| February | 34.5 °F | 57.2 °F | 5.5 in. |
| March | 40.9 °F | 65.5 °F | 5.59 in. |
| April | 48.5 °F | 73.9 °F | 5.17 in. |
| May | 57.8 °F | 81.1 °F | 4.55 in. |
| June | 66.2 °F | 87.3 °F | 4.98 in. |
| July | 69.6 °F | 90.3 °F | 4.65 in. |
| August | 68.7 °F | 89.9 °F | 4.1 in. |
| September | 62.7 °F | 85.1 °F | 4.03 in. |
| October | 50.5 °F | 75.3 °F | 3.52 in. |
| November | 38.8 °F | 63.9 °F | 4.62 in. |
| December | 33.9 °F | 55.6 °F | 5.56 in. |
| Annual | 50.3 °F | 73.2 °F | 57.9 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |