Hardesty, Oklahoma has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 5.5 °C (low) to 21.8 °C (high). Annual precipitation averages 484.6 Millimeters. Hardesty is located in USDA Plant Hardiness Zone 6b. 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 | -6.6 °C | 9.3 °C | 12.19 mm |
| February | -5.1 °C | 11.3 °C | 10.41 mm |
| March | -0.7 °C | 16.4 °C | 30.73 mm |
| April | 4.1 °C | 21.1 °C | 41.66 mm |
| May | 10.2 °C | 26.6 °C | 59.69 mm |
| June | 16 °C | 32.1 °C | 70.87 mm |
| July | 18.6 °C | 34.5 °C | 65.53 mm |
| August | 17.6 °C | 33.3 °C | 78.74 mm |
| September | 13.1 °C | 29.7 °C | 35.05 mm |
| October | 5.5 °C | 22.6 °C | 44.96 mm |
| November | -1.3 °C | 15.5 °C | 16.51 mm |
| December | -5.9 °C | 9.1 °C | 18.29 mm |
| Annual | 5.5 °C | 21.8 °C | 484.63 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 6b : -20.6°C to -17.8°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 |