Osyka, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.9 °C (low) to 25.5 °C (high). Annual precipitation averages 1653.8 Millimeters. Osyka is located in USDA Plant Hardiness Zone 8b. 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 | 3.5 °C | 15.9 °C | 163.32 mm |
| February | 5.2 °C | 18.2 °C | 143 mm |
| March | 8.8 °C | 22.1 °C | 148.34 mm |
| April | 12.3 °C | 25.4 °C | 142.75 mm |
| May | 16.8 °C | 29.3 °C | 122.68 mm |
| June | 20.6 °C | 32.2 °C | 162.56 mm |
| July | 21.8 °C | 33.2 °C | 152.4 mm |
| August | 21.7 °C | 33.3 °C | 156.46 mm |
| September | 19.1 °C | 31.2 °C | 107.7 mm |
| October | 12.9 °C | 26.8 °C | 108.46 mm |
| November | 7.4 °C | 20.9 °C | 105.41 mm |
| December | 4.6 °C | 17.1 °C | 140.72 mm |
| Annual | 12.9 °C | 25.5 °C | 1653.8 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |