Prospect, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.3 °F (low) to 77.3 °F (high). Annual precipitation averages 60.3 Inches. Prospect is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.6 °F | 59.0 °F | 5.91 in. |
| February | 40.9 °F | 63.0 °F | 5.16 in. |
| March | 47.6 °F | 70.6 °F | 5.74 in. |
| April | 54.5 °F | 77.4 °F | 6.03 in. |
| May | 63.1 °F | 84.3 °F | 4.77 in. |
| June | 69.8 °F | 90.0 °F | 4.89 in. |
| July | 72.2 °F | 92.4 °F | 4.46 in. |
| August | 71.6 °F | 93.1 °F | 4.45 in. |
| September | 66.2 °F | 88.6 °F | 3.9 in. |
| October | 55.1 °F | 79.9 °F | 4.26 in. |
| November | 44.9 °F | 68.6 °F | 5.05 in. |
| December | 39.5 °F | 60.7 °F | 5.72 in. |
| Annual | 55.3 °F | 77.3 °F | 60.34 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |