Palmer, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.9 °C (low) to 10.3 °C (high). Annual precipitation averages 828.3 Millimeters. Palmer is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14 °C | -5.1 °C | 43.94 mm |
| February | -14.4 °C | -3.3 °C | 38.1 mm |
| March | -10 °C | 2.4 °C | 45.97 mm |
| April | -3.1 °C | 8.7 °C | 68.58 mm |
| May | 3.8 °C | 16.8 °C | 80.26 mm |
| June | 9.3 °C | 22.3 °C | 86.61 mm |
| July | 12 °C | 25.1 °C | 95.76 mm |
| August | 11.1 °C | 24.1 °C | 73.15 mm |
| September | 7.3 °C | 19.7 °C | 92.71 mm |
| October | 1.3 °C | 11.6 °C | 95.76 mm |
| November | -4.2 °C | 3.9 °C | 55.63 mm |
| December | -10.3 °C | -2.3 °C | 51.82 mm |
| Annual | -0.9 °C | 10.3 °C | 828.29 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |