Pelahatchie, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.6 °C (low) to 24.7 °C (high). Annual precipitation averages 1536.2 Millimeters. Pelahatchie 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 | 1.8 °C | 14.2 °C | 146.3 mm |
| February | 3.4 °C | 16.7 °C | 147.07 mm |
| March | 7.2 °C | 20.8 °C | 148.59 mm |
| April | 11.1 °C | 24.9 °C | 148.84 mm |
| May | 15.9 °C | 28.7 °C | 105.92 mm |
| June | 19.9 °C | 32 °C | 119.89 mm |
| July | 21.3 °C | 33.3 °C | 148.59 mm |
| August | 20.9 °C | 33.3 °C | 111.76 mm |
| September | 17.8 °C | 31.1 °C | 101.35 mm |
| October | 11.2 °C | 26.2 °C | 89.41 mm |
| November | 5.7 °C | 19.7 °C | 122.43 mm |
| December | 2.9 °C | 15.4 °C | 146.05 mm |
| Annual | 11.6 °C | 24.7 °C | 1536.2 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 |