Rainbow City, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.2 °C (low) to 22.9 °C (high). Annual precipitation averages 1470.7 Millimeters. 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 | -0.3 °C | 11.5 °C | 143 mm |
| February | 1.4 °C | 14 °C | 139.7 mm |
| March | 4.9 °C | 18.6 °C | 141.99 mm |
| April | 9.2 °C | 23.3 °C | 131.32 mm |
| May | 14.3 °C | 27.3 °C | 115.57 mm |
| June | 19 °C | 30.7 °C | 126.49 mm |
| July | 20.9 °C | 32.4 °C | 118.11 mm |
| August | 20.4 °C | 32.2 °C | 104.14 mm |
| September | 17.1 °C | 29.5 °C | 102.36 mm |
| October | 10.3 °C | 24.1 °C | 89.41 mm |
| November | 3.8 °C | 17.7 °C | 117.35 mm |
| December | 1.1 °C | 13.1 °C | 141.22 mm |
| Annual | 10.2 °C | 22.9 °C | 1470.66 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |