Old Eucha, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 21.4 °C (high). Annual precipitation averages 1213.4 Millimeters. Old Eucha 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 | -3.3 °C | 8.7 °C | 66.55 mm |
| February | -1.3 °C | 11.3 °C | 60.45 mm |
| March | 3.3 °C | 16.4 °C | 100.33 mm |
| April | 8.2 °C | 21.5 °C | 122.68 mm |
| May | 13.6 °C | 25.5 °C | 159.77 mm |
| June | 18.6 °C | 30 °C | 123.95 mm |
| July | 20.9 °C | 32.9 °C | 103.63 mm |
| August | 20 °C | 32.8 °C | 92.46 mm |
| September | 15.6 °C | 28.7 °C | 113.54 mm |
| October | 9.1 °C | 22.6 °C | 107.44 mm |
| November | 3.3 °C | 15.9 °C | 89.15 mm |
| December | -1.4 °C | 10.2 °C | 73.41 mm |
| Annual | 8.9 °C | 21.4 °C | 1213.36 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |