Collinsville, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10 °C (low) to 22.2 °C (high). Annual precipitation averages 1460.3 Millimeters. Collinsville 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 | -0.4 °C | 10.6 °C | 135.38 mm |
| February | 1.2 °C | 13 °C | 132.84 mm |
| March | 4.7 °C | 17.7 °C | 147.07 mm |
| April | 8.9 °C | 22.5 °C | 139.7 mm |
| May | 14.1 °C | 26.6 °C | 120.4 mm |
| June | 18.7 °C | 30.4 °C | 119.63 mm |
| July | 20.5 °C | 32 °C | 106.17 mm |
| August | 20.1 °C | 31.7 °C | 106.43 mm |
| September | 16.7 °C | 29 °C | 104.14 mm |
| October | 10.2 °C | 23.5 °C | 86.36 mm |
| November | 3.8 °C | 16.9 °C | 113.54 mm |
| December | 1 °C | 12.2 °C | 148.59 mm |
| Annual | 10 °C | 22.2 °C | 1460.25 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |