Arapaho, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.6 °C (low) to 22.4 °C (high). Annual precipitation averages 768.9 Millimeters. Arapaho is located in USDA Plant Hardiness Zone 7b. 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 | -3.6 °C | 9.8 °C | 25.91 mm |
| February | -1.9 °C | 11.9 °C | 30.73 mm |
| March | 2.7 °C | 17.1 °C | 54.86 mm |
| April | 7.3 °C | 22 °C | 72.14 mm |
| May | 13.3 °C | 26.8 °C | 106.93 mm |
| June | 18.8 °C | 32 °C | 97.28 mm |
| July | 21.1 °C | 34.9 °C | 60.71 mm |
| August | 20.3 °C | 34.4 °C | 92.96 mm |
| September | 16.1 °C | 29.8 °C | 74.17 mm |
| October | 8.9 °C | 23.3 °C | 76.2 mm |
| November | 2.3 °C | 16.1 °C | 39.88 mm |
| December | -2.6 °C | 10.3 °C | 37.08 mm |
| Annual | 8.6 °C | 22.4 °C | 768.85 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 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |