Glenwood, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.1 °C (low) to 16.3 °C (high). Annual precipitation averages 1136.6 Millimeters. Glenwood is located in USDA Plant Hardiness Zone 6a. 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 | -7.4 °C | 1.7 °C | 81.53 mm |
| February | -5.9 °C | 3.9 °C | 65.79 mm |
| March | -1.4 °C | 9.7 °C | 92.71 mm |
| April | 4.5 °C | 16.7 °C | 117.09 mm |
| May | 10.4 °C | 22.1 °C | 126.75 mm |
| June | 15.6 °C | 26.9 °C | 127 mm |
| July | 17 °C | 28.4 °C | 107.95 mm |
| August | 15.8 °C | 27.7 °C | 84.07 mm |
| September | 11.6 °C | 24.9 °C | 80.01 mm |
| October | 5.6 °C | 18.2 °C | 80.26 mm |
| November | 0.1 °C | 10.7 °C | 87.63 mm |
| December | -4.2 °C | 4.1 °C | 85.85 mm |
| Annual | 5.1 °C | 16.3 °C | 1136.64 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 6a : -23.3°C to -20.6°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 |