Montgomery, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.1 °C (low) to 25.3 °C (high). Annual precipitation averages 1488.2 Millimeters. Montgomery 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 | 3.3 °C | 14.9 °C | 147.07 mm |
| February | 5.1 °C | 17.2 °C | 128.27 mm |
| March | 8.7 °C | 21.4 °C | 137.41 mm |
| April | 12.7 °C | 25.3 °C | 141.22 mm |
| May | 17.5 °C | 29.3 °C | 117.86 mm |
| June | 21.3 °C | 32.6 °C | 120.9 mm |
| July | 22.8 °C | 33.9 °C | 110.49 mm |
| August | 22.3 °C | 34.3 °C | 98.81 mm |
| September | 19.2 °C | 31.6 °C | 98.04 mm |
| October | 13 °C | 26.5 °C | 112.52 mm |
| November | 7.4 °C | 20.3 °C | 129.54 mm |
| December | 4.3 °C | 15.9 °C | 146.05 mm |
| Annual | 13.1 °C | 25.3 °C | 1488.18 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |