Lyons, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.2 °C (low) to 14 °C (high). Annual precipitation averages 940.6 Millimeters. Lyons is located in USDA Plant Hardiness Zone 5b. 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 | -10.6 °C | -1.8 °C | 47.24 mm |
| February | -9 °C | 0.3 °C | 45.97 mm |
| March | -3.9 °C | 6.5 °C | 54.86 mm |
| April | 1.9 °C | 13.8 °C | 94.49 mm |
| May | 8 °C | 20.2 °C | 106.68 mm |
| June | 13.6 °C | 25.8 °C | 123.19 mm |
| July | 16.1 °C | 27.9 °C | 93.47 mm |
| August | 15.1 °C | 27.1 °C | 95.76 mm |
| September | 10.7 °C | 23.5 °C | 89.66 mm |
| October | 4.4 °C | 16 °C | 74.93 mm |
| November | -1.4 °C | 8 °C | 61.98 mm |
| December | -7.1 °C | 1.1 °C | 52.32 mm |
| Annual | 3.2 °C | 14 °C | 940.55 mm |
| 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |