Maynard, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1 °C (low) to 12.5 °C (high). Annual precipitation averages 708.2 Millimeters. Maynard is located in USDA Plant Hardiness Zone 4b. 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 | -15.8 °C | -5.6 °C | 18.29 mm |
| February | -13.7 °C | -3 °C | 20.32 mm |
| March | -6.5 °C | 3.9 °C | 37.34 mm |
| April | 0.7 °C | 13 °C | 62.99 mm |
| May | 7.8 °C | 20.4 °C | 86.61 mm |
| June | 13.9 °C | 25.9 °C | 115.57 mm |
| July | 15.9 °C | 28.1 °C | 91.95 mm |
| August | 14.3 °C | 26.8 °C | 92.71 mm |
| September | 9.5 °C | 23.2 °C | 72.14 mm |
| October | 2.3 °C | 15.1 °C | 56.39 mm |
| November | -4.9 °C | 5.3 °C | 31.5 mm |
| December | -11.8 °C | -2.6 °C | 22.35 mm |
| Annual | 1 °C | 12.5 °C | 708.16 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |