Kosciusko, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.8 °C (low) to 23.5 °C (high). Annual precipitation averages 1512.6 Millimeters. Kosciusko is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.7 °C | 12.6 °C | 135.13 mm |
| February | 2.2 °C | 15.2 °C | 135.38 mm |
| March | 5.9 °C | 19.7 °C | 150.62 mm |
| April | 10.2 °C | 23.8 °C | 148.59 mm |
| May | 15.1 °C | 27.6 °C | 121.92 mm |
| June | 19.4 °C | 31.2 °C | 108.2 mm |
| July | 21.2 °C | 32.6 °C | 142.24 mm |
| August | 20.6 °C | 32.4 °C | 108.71 mm |
| September | 17.2 °C | 29.8 °C | 102.87 mm |
| October | 10.7 °C | 24.4 °C | 101.35 mm |
| November | 4.9 °C | 18.4 °C | 116.08 mm |
| December | 2 °C | 13.8 °C | 141.48 mm |
| Annual | 10.8 °C | 23.5 °C | 1512.57 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°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 |