Grant, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.5 °C (low) to 20.8 °C (high). Annual precipitation averages 1492.7 Millimeters. Grant 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 | -1.1 °C | 9.2 °C | 142.49 mm |
| February | 0.7 °C | 11.7 °C | 142.49 mm |
| March | 4.4 °C | 16.3 °C | 140.21 mm |
| April | 8.9 °C | 21 °C | 132.33 mm |
| May | 13.7 °C | 25.1 °C | 121.41 mm |
| June | 18.2 °C | 29 °C | 122.17 mm |
| July | 19.7 °C | 30.6 °C | 116.33 mm |
| August | 19.2 °C | 30.3 °C | 102.11 mm |
| September | 15.8 °C | 27.6 °C | 108.71 mm |
| October | 9.4 °C | 22.1 °C | 92.96 mm |
| November | 3.7 °C | 15.6 °C | 121.16 mm |
| December | 0.9 °C | 10.9 °C | 150.37 mm |
| Annual | 9.5 °C | 20.8 °C | 1492.74 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 |