Saginaw, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.3 °C (low) to 14 °C (high). Annual precipitation averages 861.3 Millimeters. Saginaw is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.3 °C | -1.3 °C | 53.34 mm |
| February | -9 °C | 0.2 °C | 46.48 mm |
| March | -4.6 °C | 5.8 °C | 48.01 mm |
| April | 1.6 °C | 13.3 °C | 88.65 mm |
| May | 8.1 °C | 20.3 °C | 93.22 mm |
| June | 13.6 °C | 25.8 °C | 94.49 mm |
| July | 15.6 °C | 28 °C | 79.25 mm |
| August | 14.7 °C | 26.8 °C | 87.88 mm |
| September | 10.3 °C | 23.3 °C | 71.63 mm |
| October | 4.6 °C | 16 °C | 81.79 mm |
| November | -0.7 °C | 8.2 °C | 64.77 mm |
| December | -5.4 °C | 1.7 °C | 51.82 mm |
| Annual | 3.3 °C | 14 °C | 861.33 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |