Arnett, Oklahoma has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 6.9 °C (low) to 21.6 °C (high). Annual precipitation averages 639.1 Millimeters. Arnett is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.4 °C | 9.4 °C | 18.8 mm |
| February | -3.9 °C | 11.1 °C | 26.92 mm |
| March | 0.9 °C | 16.6 °C | 42.93 mm |
| April | 5.7 °C | 21.4 °C | 63.25 mm |
| May | 11.7 °C | 26.2 °C | 95.5 mm |
| June | 17.3 °C | 30.9 °C | 90.93 mm |
| July | 19.7 °C | 33.6 °C | 62.99 mm |
| August | 18.7 °C | 33.2 °C | 69.34 mm |
| September | 14.4 °C | 28.8 °C | 48.77 mm |
| October | 7.2 °C | 22.4 °C | 64.52 mm |
| November | 0.3 °C | 15.8 °C | 26.92 mm |
| December | -4.4 °C | 9.6 °C | 28.19 mm |
| Annual | 6.9 °C | 21.6 °C | 639.06 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |