Byram, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.8 °F (low) to 76.2 °F (high). Annual precipitation averages 58.1 Inches. Byram is located in USDA Plant Hardiness Zone 8b. 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 | 36.0 °F | 57.0 °F | 5.49 in. |
| February | 38.8 °F | 61.7 °F | 5.59 in. |
| March | 45.5 °F | 69.3 °F | 5.53 in. |
| April | 52.8 °F | 76.3 °F | 6.1 in. |
| May | 61.9 °F | 83.5 °F | 4.29 in. |
| June | 68.9 °F | 89.4 °F | 4.62 in. |
| July | 71.3 °F | 91.7 °F | 5.05 in. |
| August | 70.6 °F | 91.9 °F | 4.54 in. |
| September | 65.0 °F | 87.7 °F | 3.72 in. |
| October | 53.1 °F | 78.6 °F | 3.34 in. |
| November | 43.2 °F | 67.3 °F | 4.64 in. |
| December | 38.1 °F | 59.4 °F | 5.23 in. |
| Annual | 53.8 °F | 76.2 °F | 58.14 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |