| 2023 Hardiness Zone: | 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: | 47f - Rolling Loess Prairies |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 52726 - Blue Grass, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 18 | 28 | 39 | 51 | 61 | 65 | 63 | 54 | 42 | 30 | 18 | 40 |
| Avg Max Temp (°F) | 29 | 35 | 47 | 61 | 72 | 82 | 85 | 83 | 76 | 64 | 47 | 34 | 60 |
| Avg Precip (In.) | 1.36 | 1.35 | 2.58 | 3.51 | 4.15 | 4.4 | 4 | 4.29 | 3.31 | 2.71 | 2.58 | 1.98 | 36.22 |