Montgomery, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.1 °C (low) to 26.2 °C (high). Annual precipitation averages 1246.4 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 | 4.6 °C | 16.4 °C | 104.65 mm |
| February | 6.6 °C | 18.6 °C | 83.06 mm |
| March | 10.1 °C | 22.3 °C | 88.39 mm |
| April | 13.7 °C | 25.9 °C | 93.73 mm |
| May | 18.3 °C | 29.7 °C | 130.81 mm |
| June | 21.8 °C | 32.9 °C | 111.51 mm |
| July | 22.9 °C | 34.4 °C | 75.18 mm |
| August | 22.7 °C | 35.1 °C | 102.62 mm |
| September | 19.9 °C | 32.1 °C | 104.9 mm |
| October | 14.4 °C | 27.6 °C | 124.46 mm |
| November | 9.2 °C | 21.7 °C | 121.16 mm |
| December | 5.5 °C | 17.3 °C | 105.92 mm |
| Annual | 14.1 °C | 26.2 °C | 1246.39 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |