| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°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: | 47f - Rolling Loess Prairies | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 52320 - Olin, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 14 | 26 | 37 | 48 | 58 | 62 | 60 | 51 | 39 | 27 | 15 | 37 |
| Avg Max Temp (°F) | 27 | 33 | 46 | 60 | 72 | 81 | 84 | 82 | 75 | 63 | 45 | 32 | 58 |
| Avg Precip (In.) | 1.18 | 1.24 | 2.32 | 3.44 | 4.19 | 4.52 | 3.99 | 4.56 | 3.5 | 2.53 | 2.51 | 1.65 | 35.66 |