Hamilton, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.7 °C (low) to 23.6 °C (high). Annual precipitation averages 1434.6 Millimeters. Hamilton is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.3 °C | 12.1 °C | 131.83 mm |
| February | 1.9 °C | 14.7 °C | 135.89 mm |
| March | 5.8 °C | 19.3 °C | 130.3 mm |
| April | 10.1 °C | 23.8 °C | 140.72 mm |
| May | 15.3 °C | 28 °C | 123.44 mm |
| June | 19.7 °C | 31.6 °C | 111.76 mm |
| July | 21.5 °C | 33.2 °C | 129.29 mm |
| August | 20.9 °C | 33.1 °C | 101.85 mm |
| September | 17.1 °C | 30.3 °C | 87.88 mm |
| October | 10.4 °C | 24.9 °C | 89.15 mm |
| November | 4.3 °C | 18.2 °C | 108.71 mm |
| December | 1.6 °C | 13.4 °C | 143.76 mm |
| Annual | 10.7 °C | 23.6 °C | 1434.58 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 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 |