Medford, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.3 °C (low) to 11 °C (high). Annual precipitation averages 851.9 Millimeters. Medford is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16 °C | -5.9 °C | 27.94 mm |
| February | -14.8 °C | -3.3 °C | 26.67 mm |
| March | -8.3 °C | 3.3 °C | 42.42 mm |
| April | -0.9 °C | 11.1 °C | 75.18 mm |
| May | 6.1 °C | 18.4 °C | 93.47 mm |
| June | 11.6 °C | 23.4 °C | 120.9 mm |
| July | 13.7 °C | 25.9 °C | 96.77 mm |
| August | 12.4 °C | 24.7 °C | 105.16 mm |
| September | 8.1 °C | 20.7 °C | 99.31 mm |
| October | 1.5 °C | 12.8 °C | 79.5 mm |
| November | -4.7 °C | 4.2 °C | 47.5 mm |
| December | -11.7 °C | -3 °C | 37.08 mm |
| Annual | -0.3 °C | 11 °C | 851.9 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |