Windom, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.1 °C (low) to 23.3 °C (high). Annual precipitation averages 1136.1 Millimeters. Windom is located in USDA Plant Hardiness Zone 8a. 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 | -0.1 °C | 11.8 °C | 73.91 mm |
| February | 1.8 °C | 14.1 °C | 82.8 mm |
| March | 5.9 °C | 18.4 °C | 101.09 mm |
| April | 10.2 °C | 22.7 °C | 97.03 mm |
| May | 15.7 °C | 26.8 °C | 135.38 mm |
| June | 20.3 °C | 31.4 °C | 101.09 mm |
| July | 22.3 °C | 34.2 °C | 70.61 mm |
| August | 21.7 °C | 34.3 °C | 65.79 mm |
| September | 17.8 °C | 30.6 °C | 92.46 mm |
| October | 11.3 °C | 24.7 °C | 118.62 mm |
| November | 5.6 °C | 18.1 °C | 96.77 mm |
| December | 1.2 °C | 12.9 °C | 100.58 mm |
| Annual | 11.1 °C | 23.3 °C | 1136.13 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 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |