Tecumseh, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.2 °F (low) to 59.1 °F (high). Annual precipitation averages 35.6 Inches. Tecumseh is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.9 °F | 31.7 °F | 2.35 in. |
| February | 16.8 °F | 34.9 °F | 2.0 in. |
| March | 25.1 °F | 45.0 °F | 2.42 in. |
| April | 35.9 °F | 58.6 °F | 3.34 in. |
| May | 47.0 °F | 70.4 °F | 3.95 in. |
| June | 56.7 °F | 79.9 °F | 3.67 in. |
| July | 60.0 °F | 83.8 °F | 3.33 in. |
| August | 58.4 °F | 81.8 °F | 3.38 in. |
| September | 50.7 °F | 75.5 °F | 3.06 in. |
| October | 39.8 °F | 62.6 °F | 2.93 in. |
| November | 30.1 °F | 48.3 °F | 2.83 in. |
| December | 22.0 °F | 36.8 °F | 2.29 in. |
| Annual | 38.2 °F | 59.1 °F | 35.55 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |