| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 47c - Iowan Surface | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 50461 - Osage, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 4 | 10 | 23 | 35 | 48 | 57 | 61 | 59 | 49 | 38 | 24 | 10 | 35 |
| Avg Max Temp (°F) | 22 | 28 | 41 | 56 | 69 | 79 | 82 | 80 | 72 | 60 | 41 | 27 | 55 |
| Avg Precip (In.) | 1.03 | .78 | 1.99 | 3.46 | 4.11 | 4.76 | 4.32 | 4.71 | 3.57 | 2.4 | 2.08 | 1.18 | 34.39 |