Montevallo, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.7 °C (low) to 24.1 °C (high). Annual precipitation averages 1465.1 Millimeters. Montevallo is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.6 °C | 13.3 °C | 136.65 mm |
| February | 2.2 °C | 15.8 °C | 148.34 mm |
| March | 5.7 °C | 20.3 °C | 141.22 mm |
| April | 9.6 °C | 24.5 °C | 132.84 mm |
| May | 14.7 °C | 28.4 °C | 108.46 mm |
| June | 19 °C | 31.7 °C | 123.95 mm |
| July | 20.9 °C | 33.3 °C | 128.27 mm |
| August | 20.6 °C | 33 °C | 106.68 mm |
| September | 17.4 °C | 30.6 °C | 97.79 mm |
| October | 10.7 °C | 25.1 °C | 82.04 mm |
| November | 4.7 °C | 18.9 °C | 117.09 mm |
| December | 1.9 °C | 14.4 °C | 141.73 mm |
| Annual | 10.7 °C | 24.1 °C | 1465.06 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |