Conroe, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.2 °C (low) to 26.3 °C (high). Annual precipitation averages 1274.6 Millimeters. Conroe is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.7 °C | 16.7 °C | 107.7 mm |
| February | 6.7 °C | 18.8 °C | 82.04 mm |
| March | 10.3 °C | 22.4 °C | 95.25 mm |
| April | 13.8 °C | 26.1 °C | 89.15 mm |
| May | 18.4 °C | 29.9 °C | 127.76 mm |
| June | 21.8 °C | 33.1 °C | 120.14 mm |
| July | 23 °C | 34.3 °C | 85.6 mm |
| August | 22.7 °C | 34.9 °C | 107.19 mm |
| September | 20 °C | 32.2 °C | 102.87 mm |
| October | 14.6 °C | 27.7 °C | 132.84 mm |
| November | 9.2 °C | 21.8 °C | 118.62 mm |
| December | 5.6 °C | 17.4 °C | 105.41 mm |
| Annual | 14.2 °C | 26.3 °C | 1274.57 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| 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 |