Lyon, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.4 °C (low) to 22.6 °C (high). Annual precipitation averages 1427.5 Millimeters. Lyon is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.4 °C | 10.2 °C | 132.84 mm |
| February | 2.1 °C | 12.6 °C | 142.49 mm |
| March | 6.2 °C | 17.6 °C | 130.56 mm |
| April | 11.1 °C | 22.8 °C | 155.45 mm |
| May | 16.6 °C | 27.5 °C | 135.89 mm |
| June | 20.7 °C | 31.4 °C | 112.52 mm |
| July | 22.2 °C | 32.6 °C | 108.2 mm |
| August | 21.2 °C | 32.7 °C | 78.23 mm |
| September | 17.4 °C | 30.1 °C | 78.49 mm |
| October | 11 °C | 24.4 °C | 95.76 mm |
| November | 5.3 °C | 17 °C | 110.74 mm |
| December | 2.1 °C | 11.7 °C | 146.3 mm |
| Annual | 11.4 °C | 22.6 °C | 1427.47 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |