Plains, Texas has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 45 °F (low) to 74.8 °F (high). Annual precipitation averages 15.9 Inches. Plains is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.4 °F | 55.0 °F | 0.54 in. |
| February | 28.4 °F | 59.6 °F | 0.46 in. |
| March | 35.2 °F | 67.6 °F | 0.95 in. |
| April | 42.6 °F | 75.5 °F | 0.82 in. |
| May | 53.0 °F | 83.9 °F | 1.58 in. |
| June | 62.4 °F | 91.8 °F | 1.92 in. |
| July | 65.6 °F | 92.7 °F | 2.52 in. |
| August | 64.3 °F | 91.4 °F | 2.08 in. |
| September | 57.4 °F | 84.6 °F | 2.34 in. |
| October | 45.8 °F | 75.8 °F | 1.25 in. |
| November | 33.5 °F | 63.8 °F | 0.78 in. |
| December | 26.6 °F | 55.8 °F | 0.63 in. |
| Annual | 45 °F | 74.8 °F | 15.87 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |