Waseca, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 12.5 °C (high). Annual precipitation averages 891.5 Millimeters. Waseca 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 | -14.5 °C | -5.1 °C | 23.88 mm |
| February | -12.5 °C | -2.7 °C | 24.38 mm |
| March | -5.3 °C | 4.3 °C | 47.75 mm |
| April | 1.5 °C | 13.1 °C | 80.01 mm |
| May | 8.4 °C | 19.9 °C | 111.76 mm |
| June | 14.6 °C | 25.6 °C | 133.86 mm |
| July | 16.3 °C | 27.3 °C | 119.63 mm |
| August | 14.8 °C | 26 °C | 116.84 mm |
| September | 10.2 °C | 22.7 °C | 97.03 mm |
| October | 3 °C | 15 °C | 64.77 mm |
| November | -3.8 °C | 5.8 °C | 41.4 mm |
| December | -10.5 °C | -2 °C | 30.23 mm |
| Annual | 1.9 °C | 12.5 °C | 891.54 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 |