Luther, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.3 °C (low) to 22.1 °C (high). Annual precipitation averages 919.2 Millimeters. Luther is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3 °C | 9.8 °C | 33.53 mm |
| February | -1.3 °C | 11.9 °C | 39.62 mm |
| March | 3.5 °C | 17 °C | 69.09 mm |
| April | 8.6 °C | 22.2 °C | 93.22 mm |
| May | 14.2 °C | 26.2 °C | 127.25 mm |
| June | 19.3 °C | 30.8 °C | 120.65 mm |
| July | 21.7 °C | 34 °C | 84.33 mm |
| August | 20.9 °C | 33.8 °C | 82.04 mm |
| September | 16.2 °C | 29.4 °C | 87.88 mm |
| October | 9.6 °C | 23.3 °C | 86.87 mm |
| November | 3.6 °C | 16.6 °C | 50.29 mm |
| December | -1.6 °C | 10.6 °C | 44.45 mm |
| Annual | 9.3 °C | 22.1 °C | 919.22 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |