Onalaska, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 56 °F (low) to 78.8 °F (high). Annual precipitation averages 52.5 Inches. Onalaska is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.6 °F | 61.1 °F | 4.54 in. |
| February | 42.2 °F | 65.1 °F | 3.72 in. |
| March | 48.6 °F | 71.9 °F | 4.03 in. |
| April | 55.1 °F | 78.6 °F | 3.9 in. |
| May | 63.8 °F | 85.2 °F | 4.96 in. |
| June | 70.1 °F | 91.2 °F | 5.09 in. |
| July | 72.4 °F | 93.9 °F | 3.51 in. |
| August | 71.9 °F | 95.0 °F | 4.39 in. |
| September | 66.4 °F | 89.5 °F | 4.0 in. |
| October | 56.5 °F | 81.2 °F | 4.93 in. |
| November | 46.7 °F | 70.4 °F | 4.7 in. |
| December | 40.2 °F | 62.5 °F | 4.77 in. |
| Annual | 56 °F | 78.8 °F | 52.54 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |