Lyons, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.9 °C (low) to 26.4 °C (high). Annual precipitation averages 1066.3 Millimeters. Lyons is located in USDA Plant Hardiness Zone 9a. 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 | 3.9 °C | 16.2 °C | 83.57 mm |
| February | 6 °C | 18.2 °C | 71.88 mm |
| March | 9.6 °C | 22.1 °C | 83.31 mm |
| April | 13.5 °C | 26.1 °C | 82.8 mm |
| May | 18.1 °C | 29.9 °C | 123.95 mm |
| June | 21.8 °C | 33.6 °C | 99.06 mm |
| July | 22.9 °C | 35.2 °C | 48.51 mm |
| August | 22.8 °C | 35.9 °C | 82.3 mm |
| September | 19.8 °C | 32.9 °C | 86.36 mm |
| October | 14.2 °C | 27.9 °C | 119.13 mm |
| November | 8.8 °C | 21.7 °C | 93.98 mm |
| December | 4.8 °C | 17.3 °C | 91.44 mm |
| Annual | 13.9 °C | 26.4 °C | 1066.29 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 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 |