Tecumseh, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.6 °C (low) to 22.5 °C (high). Annual precipitation averages 982.7 Millimeters. Tecumseh 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.6 °C | 10.4 °C | 38.35 mm |
| February | -0.5 °C | 12.8 °C | 46.99 mm |
| March | 4.2 °C | 17.7 °C | 72.9 mm |
| April | 8.9 °C | 22.6 °C | 99.06 mm |
| May | 14.4 °C | 26.3 °C | 135.64 mm |
| June | 19.4 °C | 30.9 °C | 120.14 mm |
| July | 21.7 °C | 34 °C | 89.66 mm |
| August | 20.9 °C | 33.9 °C | 87.12 mm |
| September | 16.4 °C | 29.7 °C | 97.54 mm |
| October | 9.9 °C | 23.7 °C | 85.85 mm |
| November | 3.9 °C | 17.1 °C | 55.88 mm |
| December | -0.9 °C | 11.3 °C | 53.59 mm |
| Annual | 9.6 °C | 22.5 °C | 982.72 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |