Waterville, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.8 °C (low) to 12.6 °C (high). Annual precipitation averages 853.5 Millimeters. Waterville 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 | -14.7 °C | -5 °C | 22.61 mm |
| February | -12.6 °C | -2.5 °C | 23.88 mm |
| March | -5.4 °C | 4.4 °C | 45.47 mm |
| April | 1.4 °C | 13.2 °C | 75.69 mm |
| May | 8.4 °C | 20.1 °C | 106.93 mm |
| June | 14.4 °C | 25.7 °C | 130.05 mm |
| July | 16.3 °C | 27.5 °C | 112.52 mm |
| August | 14.8 °C | 26.3 °C | 114.81 mm |
| September | 10.2 °C | 22.8 °C | 88.65 mm |
| October | 3 °C | 15 °C | 62.99 mm |
| November | -3.9 °C | 5.7 °C | 39.88 mm |
| December | -10.6 °C | -1.9 °C | 29.97 mm |
| Annual | 1.8 °C | 12.6 °C | 853.45 mm |
| 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 : -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 |