Cool, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.6 °C (low) to 24.9 °C (high). Annual precipitation averages 857.2 Millimeters. Cool is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.2 °C | 14 °C | 47.24 mm |
| February | 2.2 °C | 15.9 °C | 59.94 mm |
| March | 6.6 °C | 20.4 °C | 77.22 mm |
| April | 10.8 °C | 24.8 °C | 71.37 mm |
| May | 16.3 °C | 28.6 °C | 108.46 mm |
| June | 20.8 °C | 32.8 °C | 92.71 mm |
| July | 22.7 °C | 35.3 °C | 50.8 mm |
| August | 22.3 °C | 35.6 °C | 64.77 mm |
| September | 18.2 °C | 31.5 °C | 74.17 mm |
| October | 11.8 °C | 25.9 °C | 96.01 mm |
| November | 5.9 °C | 19.3 °C | 61.72 mm |
| December | 1.2 °C | 14.6 °C | 52.83 mm |
| Annual | 11.6 °C | 24.9 °C | 857.24 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 |