Spearman, Texas has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 6.3 °C (low) to 22.3 °C (high). Annual precipitation averages 524.8 Millimeters. Spearman is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.3 °C | 10.2 °C | 16.51 mm |
| February | -4.1 °C | 12.1 °C | 10.67 mm |
| March | 0.3 °C | 17.3 °C | 33.27 mm |
| April | 4.7 °C | 22 °C | 46.48 mm |
| May | 10.7 °C | 27.1 °C | 58.67 mm |
| June | 16.6 °C | 32.3 °C | 81.53 mm |
| July | 19.1 °C | 34.4 °C | 73.66 mm |
| August | 18.1 °C | 33.2 °C | 73.91 mm |
| September | 13.7 °C | 29.6 °C | 43.18 mm |
| October | 6.7 °C | 23.3 °C | 46.74 mm |
| November | -0.1 °C | 16.1 °C | 19.81 mm |
| December | -4.6 °C | 10.2 °C | 20.32 mm |
| Annual | 6.3 °C | 22.3 °C | 524.75 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |