| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 40a - Loess Flats and Till Plains |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 52641 - Mount Pleasant, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 19 | 29 | 40 | 51 | 60 | 64 | 62 | 54 | 43 | 31 | 19 | 40 |
| Avg Max Temp (°F) | 31 | 37 | 49 | 62 | 73 | 82 | 86 | 84 | 77 | 65 | 49 | 35 | 61 |
| Avg Precip (In.) | 1.32 | 1.36 | 2.55 | 3.31 | 4.39 | 4.11 | 4.64 | 4.24 | 4.21 | 2.68 | 2.67 | 1.84 | 37.3 |