Heidelberg, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.5 °F (low) to 76 °F (high). Annual precipitation averages 58.9 Inches. Heidelberg 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.8 °F | 57.7 °F | 5.69 in. |
| February | 38.0 °F | 62.1 °F | 5.37 in. |
| March | 44.2 °F | 69.5 °F | 5.99 in. |
| April | 51.2 °F | 76.4 °F | 5.25 in. |
| May | 60.0 °F | 83.4 °F | 4.14 in. |
| June | 67.7 °F | 89.3 °F | 5.23 in. |
| July | 70.2 °F | 91.2 °F | 5.64 in. |
| August | 69.2 °F | 91.0 °F | 4.77 in. |
| September | 64.1 °F | 87.0 °F | 3.67 in. |
| October | 52.0 °F | 78.0 °F | 3.3 in. |
| November | 41.6 °F | 67.3 °F | 4.39 in. |
| December | 36.9 °F | 59.6 °F | 5.49 in. |
| Annual | 52.5 °F | 76 °F | 58.93 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 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 |