Mannford, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.1 °C (low) to 22.2 °C (high). Annual precipitation averages 1041.4 Millimeters. Mannford 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 | -3.4 °C | 9.6 °C | 41.4 mm |
| February | -1.4 °C | 12.1 °C | 44.96 mm |
| March | 3.6 °C | 17.2 °C | 77.72 mm |
| April | 8.6 °C | 22.4 °C | 118.11 mm |
| May | 14.2 °C | 26.2 °C | 144.53 mm |
| June | 19.2 °C | 30.8 °C | 120.9 mm |
| July | 21.5 °C | 33.8 °C | 96.77 mm |
| August | 20.4 °C | 33.8 °C | 93.22 mm |
| September | 15.8 °C | 29.2 °C | 97.03 mm |
| October | 9.1 °C | 23.4 °C | 90.17 mm |
| November | 3.4 °C | 16.7 °C | 64.26 mm |
| December | -1.7 °C | 10.7 °C | 52.32 mm |
| Annual | 9.1 °C | 22.2 °C | 1041.39 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |