Milford, Iowa has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.1 °C (low) to 13.1 °C (high). Annual precipitation averages 767.6 Millimeters. Milford is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.9 °C | -4.4 °C | 17.53 mm |
| February | -11.7 °C | -2.1 °C | 20.32 mm |
| March | -5.2 °C | 5.1 °C | 39.37 mm |
| April | 1.6 °C | 13.7 °C | 82.3 mm |
| May | 8.6 °C | 20.5 °C | 110.74 mm |
| June | 14.7 °C | 26.1 °C | 118.87 mm |
| July | 16.8 °C | 28.3 °C | 90.42 mm |
| August | 15.3 °C | 26.8 °C | 91.95 mm |
| September | 10.6 °C | 23.4 °C | 80.26 mm |
| October | 3.3 °C | 15.6 °C | 58.67 mm |
| November | -4.1 °C | 6.3 °C | 33.78 mm |
| December | -10.6 °C | -1.6 °C | 23.37 mm |
| Annual | 2.1 °C | 13.1 °C | 767.58 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |