Maynard, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 33.8 °F (low) to 54.6 °F (high). Annual precipitation averages 27.9 Inches. 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 | 3.5 °F | 22.0 °F | 0.72 in. |
| February | 7.3 °F | 26.6 °F | 0.8 in. |
| March | 20.3 °F | 39.0 °F | 1.47 in. |
| April | 33.2 °F | 55.4 °F | 2.48 in. |
| May | 46.0 °F | 68.8 °F | 3.41 in. |
| June | 57.1 °F | 78.6 °F | 4.55 in. |
| July | 60.7 °F | 82.6 °F | 3.62 in. |
| August | 57.8 °F | 80.2 °F | 3.65 in. |
| September | 49.1 °F | 73.7 °F | 2.84 in. |
| October | 36.2 °F | 59.2 °F | 2.22 in. |
| November | 23.2 °F | 41.6 °F | 1.24 in. |
| December | 10.8 °F | 27.4 °F | 0.88 in. |
| Annual | 33.8 °F | 54.6 °F | 27.88 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |