Laona, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.2 °C (low) to 10.6 °C (high). Annual precipitation averages 825 Millimeters. Laona is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.8 °C | -5.7 °C | 32.51 mm |
| February | -15 °C | -3.1 °C | 28.7 mm |
| March | -9.7 °C | 3.3 °C | 43.69 mm |
| April | -2.4 °C | 10.6 °C | 72.9 mm |
| May | 4.4 °C | 18.1 °C | 90.93 mm |
| June | 9.9 °C | 22.7 °C | 108.71 mm |
| July | 12.2 °C | 24.9 °C | 98.81 mm |
| August | 11.3 °C | 23.8 °C | 82.55 mm |
| September | 7.1 °C | 19.5 °C | 93.22 mm |
| October | 1 °C | 12.1 °C | 82.04 mm |
| November | -5.1 °C | 3.7 °C | 50.04 mm |
| December | -11.7 °C | -2.9 °C | 40.89 mm |
| Annual | -1.2 °C | 10.6 °C | 824.99 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |