Farrell, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.5 °C (low) to 22.5 °C (high). Annual precipitation averages 1405.9 Millimeters. Farrell 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.5 °C | 10 °C | 125.22 mm |
| February | 2.1 °C | 12.4 °C | 134.37 mm |
| March | 6.3 °C | 17.4 °C | 133.35 mm |
| April | 11.3 °C | 22.8 °C | 152.91 mm |
| May | 16.8 °C | 27.4 °C | 134.11 mm |
| June | 20.8 °C | 31.4 °C | 109.73 mm |
| July | 22.3 °C | 32.7 °C | 103.89 mm |
| August | 21.3 °C | 32.7 °C | 77.72 mm |
| September | 17.5 °C | 30 °C | 78.23 mm |
| October | 11.1 °C | 24.3 °C | 97.79 mm |
| November | 5.4 °C | 16.9 °C | 112.52 mm |
| December | 2.1 °C | 11.6 °C | 146.05 mm |
| Annual | 11.5 °C | 22.5 °C | 1405.89 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |