Valentine, Texas has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 7.8 °C (low) to 25.7 °C (high). Annual precipitation averages 319.3 Millimeters. Valentine is located in USDA Plant Hardiness Zone 8a. 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 | -2.3 °C | 15.7 °C | 10.41 mm |
| February | -0.2 °C | 18.5 °C | 10.92 mm |
| March | 3 °C | 22.5 °C | 8.38 mm |
| April | 6.8 °C | 26.9 °C | 6.86 mm |
| May | 11.8 °C | 31.1 °C | 17.02 mm |
| June | 16.7 °C | 34.5 °C | 42.42 mm |
| July | 17.7 °C | 33.5 °C | 67.06 mm |
| August | 17.1 °C | 32.9 °C | 54.86 mm |
| September | 14.1 °C | 30 °C | 46.74 mm |
| October | 8.3 °C | 26.6 °C | 28.19 mm |
| November | 2.1 °C | 20.4 °C | 14.22 mm |
| December | -1.7 °C | 16.1 °C | 12.19 mm |
| Annual | 7.8 °C | 25.7 °C | 319.27 mm |
| 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 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 |