Calera, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.8 °C (low) to 23.9 °C (high). Annual precipitation averages 1456.2 Millimeters. Calera is located in USDA Plant Hardiness Zone 8b. 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 | 0.8 °C | 13.2 °C | 135.38 mm |
| February | 2.4 °C | 15.7 °C | 147.07 mm |
| March | 5.9 °C | 20.1 °C | 143.26 mm |
| April | 9.7 °C | 24.3 °C | 133.86 mm |
| May | 14.8 °C | 28.2 °C | 106.68 mm |
| June | 19.1 °C | 31.4 °C | 119.38 mm |
| July | 20.9 °C | 33.1 °C | 124.21 mm |
| August | 20.6 °C | 32.7 °C | 108.2 mm |
| September | 17.4 °C | 30.3 °C | 98.81 mm |
| October | 10.8 °C | 24.9 °C | 85.6 mm |
| November | 4.9 °C | 18.8 °C | 116.08 mm |
| December | 2.1 °C | 14.2 °C | 137.67 mm |
| Annual | 10.8 °C | 23.9 °C | 1456.2 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 8b : -9.4°C to -6.7°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 |