Monterey, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.7 °F (low) to 77.2 °F (high). Annual precipitation averages 60 Inches. Monterey is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.0 °F | 58.5 °F | 5.99 in. |
| February | 41.1 °F | 63.0 °F | 5.25 in. |
| March | 48.2 °F | 70.6 °F | 5.32 in. |
| April | 55.1 °F | 77.3 °F | 5.23 in. |
| May | 63.7 °F | 84.5 °F | 4.77 in. |
| June | 70.3 °F | 89.9 °F | 5.06 in. |
| July | 72.7 °F | 92.1 °F | 4.61 in. |
| August | 71.8 °F | 92.6 °F | 4.24 in. |
| September | 66.7 °F | 88.4 °F | 4.31 in. |
| October | 55.4 °F | 79.9 °F | 4.35 in. |
| November | 45.4 °F | 69.0 °F | 5.26 in. |
| December | 40.0 °F | 60.8 °F | 5.6 in. |
| Annual | 55.7 °F | 77.2 °F | 59.99 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 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 |