Spearsville, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.2 °C (low) to 24.3 °C (high). Annual precipitation averages 1460 Millimeters. Spearsville 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.8 °C | 13.2 °C | 141.73 mm |
| February | 2.6 °C | 15.7 °C | 117.35 mm |
| March | 6.4 °C | 20.1 °C | 146.05 mm |
| April | 10.6 °C | 24.4 °C | 149.86 mm |
| May | 15.8 °C | 28.3 °C | 123.19 mm |
| June | 20.1 °C | 32.1 °C | 112.52 mm |
| July | 21.8 °C | 33.7 °C | 110.49 mm |
| August | 21.3 °C | 33.9 °C | 93.73 mm |
| September | 17.2 °C | 31 °C | 93.47 mm |
| October | 10.7 °C | 25.4 °C | 114.55 mm |
| November | 5.2 °C | 18.9 °C | 110.74 mm |
| December | 1.9 °C | 14.4 °C | 146.3 mm |
| Annual | 11.2 °C | 24.3 °C | 1459.98 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |