| 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 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 47b - Des Moines Lobe | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 51351 - Milford, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 4 | 12 | 23 | 35 | 48 | 57 | 61 | 59 | 50 | 38 | 24 | 10 | 35 |
| Avg Max Temp (°F) | 23 | 29 | 41 | 57 | 71 | 80 | 83 | 81 | 73 | 60 | 41 | 27 | 55 |
| Avg Precip (In.) | .6 | .61 | 1.9 | 3.01 | 3.73 | 4.51 | 3.75 | 3.93 | 2.79 | 2.05 | 1.72 | .75 | 29.36 |