Summit, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.5 °C (low) to 24.9 °C (high). Annual precipitation averages 1677.2 Millimeters. Summit 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 | 3 °C | 15.1 °C | 166.62 mm |
| February | 4.7 °C | 17.5 °C | 147.83 mm |
| March | 8.2 °C | 21.4 °C | 150.62 mm |
| April | 11.8 °C | 24.8 °C | 149.1 mm |
| May | 16.5 °C | 28.7 °C | 120.14 mm |
| June | 20.5 °C | 31.9 °C | 145.29 mm |
| July | 21.7 °C | 32.8 °C | 162.81 mm |
| August | 21.4 °C | 32.9 °C | 154.69 mm |
| September | 18.7 °C | 30.7 °C | 112.01 mm |
| October | 12.4 °C | 26.2 °C | 107.19 mm |
| November | 7.1 °C | 20.3 °C | 116.84 mm |
| December | 4.2 °C | 16.2 °C | 144.02 mm |
| Annual | 12.5 °C | 24.9 °C | 1677.16 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |