Montpelier, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.7 °F (low) to 78.5 °F (high). Annual precipitation averages 66.9 Inches. Montpelier 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 | 39.1 °F | 61.7 °F | 6.52 in. |
| February | 42.4 °F | 65.7 °F | 5.38 in. |
| March | 48.6 °F | 72.2 °F | 5.48 in. |
| April | 54.5 °F | 78.3 °F | 5.45 in. |
| May | 62.5 °F | 85.5 °F | 5.6 in. |
| June | 69.2 °F | 90.2 °F | 6.87 in. |
| July | 71.4 °F | 91.8 °F | 6.12 in. |
| August | 71.3 °F | 92.3 °F | 6.73 in. |
| September | 66.8 °F | 89.0 °F | 4.6 in. |
| October | 55.7 °F | 80.6 °F | 4.38 in. |
| November | 45.9 °F | 70.5 °F | 4.16 in. |
| December | 40.9 °F | 63.6 °F | 5.59 in. |
| Annual | 55.7 °F | 78.5 °F | 66.88 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 |