| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 47m - Western Loess Hills | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 51534 - Glenwood, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 16 | 27 | 38 | 50 | 60 | 65 | 62 | 52 | 40 | 27 | 16 | 39 |
| Avg Max Temp (°F) | 31 | 38 | 50 | 63 | 74 | 84 | 87 | 85 | 78 | 67 | 48 | 35 | 62 |
| Avg Precip (In.) | .75 | .81 | 2.18 | 3.23 | 4.69 | 4.59 | 4.41 | 3.64 | 3.26 | 2.31 | 1.85 | 1 | 32.72 |