Seminole, Texas has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 8.6 °C (low) to 24.6 °C (high). Annual precipitation averages 402.3 Millimeters. Seminole 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.1 °C | 13.5 °C | 17.78 mm |
| February | -0.4 °C | 16.2 °C | 17.27 mm |
| March | 3.3 °C | 20.7 °C | 26.16 mm |
| April | 7.4 °C | 25.2 °C | 23.37 mm |
| May | 13.2 °C | 29.7 °C | 50.04 mm |
| June | 18 °C | 34 °C | 48.51 mm |
| July | 19.6 °C | 34.5 °C | 45.21 mm |
| August | 19 °C | 33.8 °C | 37.08 mm |
| September | 15.2 °C | 29.8 °C | 65.53 mm |
| October | 9 °C | 25.1 °C | 30.48 mm |
| November | 2.3 °C | 18.4 °C | 24.38 mm |
| December | -1.6 °C | 14 °C | 16.51 mm |
| Annual | 8.6 °C | 24.6 °C | 402.32 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |