Glenwood, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.7 °F (low) to 61 °F (high). Annual precipitation averages 39.7 Inches. Glenwood is located in USDA Plant Hardiness Zone 5b. 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 | 14.5 °F | 32.3 °F | 1.21 in. |
| February | 18.2 °F | 37.1 °F | 1.46 in. |
| March | 28.7 °F | 49.8 °F | 2.24 in. |
| April | 39.7 °F | 62.0 °F | 3.83 in. |
| May | 51.3 °F | 71.7 °F | 5.67 in. |
| June | 61.1 °F | 81.2 °F | 5.28 in. |
| July | 65.0 °F | 85.3 °F | 4.72 in. |
| August | 62.9 °F | 83.8 °F | 4.51 in. |
| September | 54.1 °F | 76.9 °F | 3.98 in. |
| October | 42.1 °F | 64.3 °F | 2.94 in. |
| November | 30.0 °F | 49.8 °F | 2.29 in. |
| December | 20.2 °F | 37.3 °F | 1.59 in. |
| Annual | 40.7 °F | 61 °F | 39.72 in. |
| 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |