Olive Branch, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.7 °C (low) to 22.1 °C (high). Annual precipitation averages 1448.3 Millimeters. Olive Branch 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 | -0.6 °C | 9.4 °C | 112.78 mm |
| February | 1.2 °C | 12.2 °C | 125.73 mm |
| March | 5.4 °C | 17.1 °C | 147.57 mm |
| April | 10.3 °C | 22.6 °C | 149.35 mm |
| May | 15.6 °C | 26.8 °C | 133.6 mm |
| June | 20.1 °C | 30.8 °C | 117.86 mm |
| July | 22 °C | 32.5 °C | 116.84 mm |
| August | 21.2 °C | 32.5 °C | 86.61 mm |
| September | 17.2 °C | 29.6 °C | 91.69 mm |
| October | 10.6 °C | 23.4 °C | 106.68 mm |
| November | 4.7 °C | 16.7 °C | 116.33 mm |
| December | 1.2 °C | 11.1 °C | 143.26 mm |
| Annual | 10.7 °C | 22.1 °C | 1448.3 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 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |