Fostoria, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.2 °F (low) to 56.7 °F (high). Annual precipitation averages 33.3 Inches. Fostoria 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.0 °F | 29.7 °F | 2.2 in. |
| February | 15.2 °F | 32.5 °F | 1.72 in. |
| March | 23.4 °F | 42.3 °F | 1.9 in. |
| April | 34.0 °F | 55.6 °F | 3.31 in. |
| May | 45.2 °F | 67.9 °F | 3.65 in. |
| June | 54.8 °F | 77.6 °F | 3.35 in. |
| July | 58.9 °F | 81.3 °F | 3.58 in. |
| August | 57.8 °F | 79.2 °F | 3.15 in. |
| September | 50.0 °F | 73.2 °F | 2.89 in. |
| October | 39.8 °F | 60.1 °F | 3.0 in. |
| November | 30.0 °F | 46.4 °F | 2.5 in. |
| December | 21.8 °F | 34.9 °F | 2.06 in. |
| Annual | 37.2 °F | 56.7 °F | 33.31 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |