Calvin, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.2 °F (low) to 77.3 °F (high). Annual precipitation averages 59 Inches. Calvin 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.5 °F | 58.2 °F | 5.76 in. |
| February | 39.3 °F | 62.3 °F | 4.98 in. |
| March | 46.1 °F | 70.4 °F | 5.41 in. |
| April | 53.4 °F | 77.6 °F | 5.84 in. |
| May | 62.1 °F | 84.5 °F | 4.84 in. |
| June | 69.3 °F | 90.6 °F | 4.81 in. |
| July | 71.9 °F | 93.1 °F | 4.45 in. |
| August | 71.1 °F | 93.5 °F | 3.75 in. |
| September | 65.0 °F | 88.9 °F | 3.56 in. |
| October | 53.9 °F | 79.6 °F | 4.55 in. |
| November | 44.1 °F | 68.2 °F | 5.03 in. |
| December | 38.2 °F | 60.1 °F | 6.05 in. |
| Annual | 54.2 °F | 77.3 °F | 59.03 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |