Lyons, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.8 °C (low) to 18.2 °C (high). Annual precipitation averages 1206.3 Millimeters. Lyons is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.6 °C | 3.4 °C | 85.09 mm |
| February | -4.2 °C | 6.1 °C | 67.82 mm |
| March | 0.6 °C | 12.1 °C | 93.73 mm |
| April | 6.3 °C | 18.9 °C | 125.98 mm |
| May | 12.3 °C | 24.1 °C | 137.92 mm |
| June | 17.1 °C | 28.6 °C | 127.76 mm |
| July | 18.6 °C | 30.3 °C | 112.27 mm |
| August | 17.5 °C | 29.9 °C | 80.77 mm |
| September | 13.3 °C | 26.8 °C | 93.22 mm |
| October | 6.9 °C | 20.3 °C | 93.73 mm |
| November | 1.3 °C | 12.3 °C | 100.33 mm |
| December | -3.1 °C | 5.9 °C | 87.63 mm |
| Annual | 6.8 °C | 18.2 °C | 1206.25 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |