Avant, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 21.8 °C (high). Annual precipitation averages 1040.6 Millimeters. Avant is located in USDA Plant Hardiness Zone 7a. 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 | -3.8 °C | 8.8 °C | 41.15 mm |
| February | -1.8 °C | 11.6 °C | 46.74 mm |
| March | 3.2 °C | 16.6 °C | 77.98 mm |
| April | 8.4 °C | 21.9 °C | 115.06 mm |
| May | 14.2 °C | 25.9 °C | 148.59 mm |
| June | 19.2 °C | 30.6 °C | 130.56 mm |
| July | 21.5 °C | 33.6 °C | 100.58 mm |
| August | 20.4 °C | 33.7 °C | 87.88 mm |
| September | 15.8 °C | 29.1 °C | 91.19 mm |
| October | 8.9 °C | 23.1 °C | 85.85 mm |
| November | 2.9 °C | 16.1 °C | 63.5 mm |
| December | -2 °C | 10.1 °C | 51.56 mm |
| Annual | 8.9 °C | 21.8 °C | 1040.64 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |