Donaldsonville, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 58.3 °F (low) to 78.4 °F (high). Annual precipitation averages 64.3 Inches. Donaldsonville is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 42.0 °F | 62.3 °F | 5.81 in. |
| February | 45.4 °F | 66.1 °F | 4.34 in. |
| March | 51.2 °F | 72.5 °F | 4.23 in. |
| April | 57.1 °F | 78.3 °F | 5.06 in. |
| May | 65.2 °F | 84.8 °F | 5.93 in. |
| June | 71.5 °F | 89.4 °F | 7.1 in. |
| July | 73.6 °F | 90.9 °F | 6.31 in. |
| August | 73.1 °F | 91.4 °F | 6.87 in. |
| September | 69.3 °F | 88.1 °F | 5.21 in. |
| October | 58.7 °F | 80.7 °F | 4.47 in. |
| November | 48.6 °F | 71.2 °F | 4.13 in. |
| December | 43.8 °F | 64.6 °F | 4.88 in. |
| Annual | 58.3 °F | 78.4 °F | 64.34 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |