Mayer, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.6 °F (low) to 54.3 °F (high). Annual precipitation averages 31.9 Inches. Mayer is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.3 °F | 22.4 °F | 0.87 in. |
| February | 8.7 °F | 27.1 °F | 0.88 in. |
| March | 21.5 °F | 39.7 °F | 1.53 in. |
| April | 34.8 °F | 55.0 °F | 2.85 in. |
| May | 47.7 °F | 68.1 °F | 4.3 in. |
| June | 58.3 °F | 77.6 °F | 4.86 in. |
| July | 62.5 °F | 82.1 °F | 3.86 in. |
| August | 60.0 °F | 79.8 °F | 4.42 in. |
| September | 51.6 °F | 72.6 °F | 3.19 in. |
| October | 38.4 °F | 58.0 °F | 2.38 in. |
| November | 25.6 °F | 41.6 °F | 1.53 in. |
| December | 12.4 °F | 27.6 °F | 1.22 in. |
| Annual | 35.6 °F | 54.3 °F | 31.89 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |