Cotter, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.5 °C (low) to 21.1 °C (high). Annual precipitation averages 1197.9 Millimeters. Cotter 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 | -4.1 °C | 8.4 °C | 82.3 mm |
| February | -2.3 °C | 11.3 °C | 79.76 mm |
| March | 2 °C | 16.1 °C | 116.84 mm |
| April | 6.8 °C | 21.4 °C | 134.37 mm |
| May | 12.2 °C | 25.4 °C | 122.68 mm |
| June | 17 °C | 30 °C | 103.12 mm |
| July | 19.1 °C | 32.4 °C | 83.31 mm |
| August | 18.1 °C | 32.1 °C | 86.11 mm |
| September | 13.8 °C | 28.3 °C | 81.28 mm |
| October | 7.3 °C | 22.4 °C | 97.28 mm |
| November | 1.9 °C | 15.7 °C | 115.82 mm |
| December | -2.4 °C | 9.9 °C | 95 mm |
| Annual | 7.5 °C | 21.1 °C | 1197.87 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |