Simsboro, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.5 °C (low) to 24.5 °C (high). Annual precipitation averages 1457.2 Millimeters. Simsboro 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 | 1.3 °C | 13.8 °C | 139.19 mm |
| February | 2.9 °C | 16.1 °C | 132.08 mm |
| March | 6.6 °C | 20.4 °C | 137.16 mm |
| April | 10.6 °C | 24.4 °C | 144.27 mm |
| May | 15.9 °C | 28.5 °C | 122.68 mm |
| June | 20.1 °C | 32.2 °C | 117.6 mm |
| July | 21.8 °C | 33.8 °C | 95.5 mm |
| August | 21.3 °C | 33.9 °C | 90.17 mm |
| September | 17.6 °C | 31.3 °C | 93.98 mm |
| October | 11.2 °C | 25.8 °C | 122.17 mm |
| November | 5.8 °C | 19.4 °C | 118.36 mm |
| December | 2.3 °C | 14.8 °C | 144.02 mm |
| Annual | 11.5 °C | 24.5 °C | 1457.18 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 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 |