Fletcher, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.7 °C (low) to 22.8 °C (high). Annual precipitation averages 835.9 Millimeters. Fletcher 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.2 °C | 10.8 °C | 30.73 mm |
| February | -0.5 °C | 12.8 °C | 38.35 mm |
| March | 4.2 °C | 17.9 °C | 60.2 mm |
| April | 8.7 °C | 22.3 °C | 85.85 mm |
| May | 14.4 °C | 26.8 °C | 117.6 mm |
| June | 19.4 °C | 31.7 °C | 108.97 mm |
| July | 21.6 °C | 34.6 °C | 68.07 mm |
| August | 21.1 °C | 34.6 °C | 72.39 mm |
| September | 16.9 °C | 30.1 °C | 84.84 mm |
| October | 10.2 °C | 23.7 °C | 81.79 mm |
| November | 3.9 °C | 17.1 °C | 44.7 mm |
| December | -1.1 °C | 11.2 °C | 42.42 mm |
| Annual | 9.7 °C | 22.8 °C | 835.91 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |