Simonton, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15 °C (low) to 26.6 °C (high). Annual precipitation averages 1251.2 Millimeters. Simonton is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Jan. 1 - Jan. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.8 °C | 17.2 °C | 95.76 mm |
| February | 7.8 °C | 19.2 °C | 72.9 mm |
| March | 11.3 °C | 22.9 °C | 90.17 mm |
| April | 14.7 °C | 26.4 °C | 98.81 mm |
| May | 19.2 °C | 30.1 °C | 122.68 mm |
| June | 22.4 °C | 32.8 °C | 124.71 mm |
| July | 23.2 °C | 34.1 °C | 85.85 mm |
| August | 23.1 °C | 35.1 °C | 118.87 mm |
| September | 20.7 °C | 32.4 °C | 118.11 mm |
| October | 15.3 °C | 28.1 °C | 116.08 mm |
| November | 10.2 °C | 22.5 °C | 109.22 mm |
| December | 6.6 °C | 18.3 °C | 98.04 mm |
| Annual | 15 °C | 26.6 °C | 1251.2 mm |
| Average First Frost Date | Jan. 1 - Jan. 10 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |