Lafayette, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 34.9 °F (low) to 54.3 °F (high). Annual precipitation averages 30.4 Inches. Lafayette 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 | 4.9 °F | 22.1 °F | 0.75 in. |
| February | 8.5 °F | 26.9 °F | 0.79 in. |
| March | 21.3 °F | 39.2 °F | 1.57 in. |
| April | 34.3 °F | 55.3 °F | 2.73 in. |
| May | 46.8 °F | 68.1 °F | 4.05 in. |
| June | 57.9 °F | 78.1 °F | 5.0 in. |
| July | 61.6 °F | 81.8 °F | 3.72 in. |
| August | 58.9 °F | 79.4 °F | 3.78 in. |
| September | 50.3 °F | 72.8 °F | 3.08 in. |
| October | 37.3 °F | 58.5 °F | 2.45 in. |
| November | 24.4 °F | 41.8 °F | 1.39 in. |
| December | 12.1 °F | 27.7 °F | 1.04 in. |
| Annual | 34.9 °F | 54.3 °F | 30.35 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |