Grimes, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13 °C (low) to 25.2 °C (high). Annual precipitation averages 1451.1 Millimeters. Grimes is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.5 °C | 15.7 °C | 125.73 mm |
| February | 5.2 °C | 17.7 °C | 136.65 mm |
| March | 8.3 °C | 21.7 °C | 134.62 mm |
| April | 12.1 °C | 25.4 °C | 120.9 mm |
| May | 17 °C | 29.7 °C | 91.44 mm |
| June | 20.9 °C | 32.2 °C | 132.33 mm |
| July | 22.2 °C | 33.1 °C | 154.94 mm |
| August | 21.8 °C | 32.6 °C | 136.14 mm |
| September | 19.3 °C | 30.7 °C | 106.93 mm |
| October | 13.4 °C | 26.3 °C | 75.69 mm |
| November | 7.6 °C | 20.7 °C | 105.66 mm |
| December | 4.9 °C | 16.8 °C | 130.05 mm |
| Annual | 13 °C | 25.2 °C | 1451.08 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°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 |