McComb, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.6 °C (low) to 25 °C (high). Annual precipitation averages 1704.3 Millimeters. McComb 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 | 3.1 °C | 15.2 °C | 168.91 mm |
| February | 4.8 °C | 17.6 °C | 147.57 mm |
| March | 8.4 °C | 21.6 °C | 151.89 mm |
| April | 11.9 °C | 24.9 °C | 152.4 mm |
| May | 16.6 °C | 28.8 °C | 119.63 mm |
| June | 20.6 °C | 32 °C | 148.34 mm |
| July | 21.7 °C | 32.9 °C | 169.42 mm |
| August | 21.6 °C | 33 °C | 160.27 mm |
| September | 18.9 °C | 30.7 °C | 114.05 mm |
| October | 12.6 °C | 26.3 °C | 108.46 mm |
| November | 7.1 °C | 20.4 °C | 118.11 mm |
| December | 4.3 °C | 16.4 °C | 145.29 mm |
| Annual | 12.6 °C | 25 °C | 1704.34 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 |