Tool, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.4 °C (low) to 25 °C (high). Annual precipitation averages 1098.5 Millimeters. Tool is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.6 °C | 14.2 °C | 83.06 mm |
| February | 3.7 °C | 16.4 °C | 87.63 mm |
| March | 7.6 °C | 19.9 °C | 101.85 mm |
| April | 11.7 °C | 24.3 °C | 95.25 mm |
| May | 16.9 °C | 28.3 °C | 116.84 mm |
| June | 21.5 °C | 32.6 °C | 102.36 mm |
| July | 22.9 °C | 35 °C | 53.34 mm |
| August | 22.4 °C | 35.6 °C | 62.48 mm |
| September | 18.8 °C | 32.1 °C | 81.03 mm |
| October | 12.5 °C | 26.4 °C | 130.81 mm |
| November | 6.9 °C | 20 °C | 85.34 mm |
| December | 2.4 °C | 15.2 °C | 98.55 mm |
| Annual | 12.4 °C | 25 °C | 1098.54 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |