Colfax, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.2 °C (low) to 12.4 °C (high). Annual precipitation averages 860.3 Millimeters. Colfax is located in USDA Plant Hardiness Zone 4b. 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 | -14.9 °C | -4.9 °C | 26.42 mm |
| February | -13.2 °C | -2.2 °C | 27.18 mm |
| March | -6.4 °C | 4.7 °C | 47.24 mm |
| April | 0.7 °C | 12.9 °C | 78.23 mm |
| May | 7.6 °C | 19.9 °C | 104.14 mm |
| June | 13.3 °C | 25.1 °C | 123.19 mm |
| July | 15.6 °C | 27.4 °C | 101.85 mm |
| August | 14.2 °C | 26.3 °C | 107.95 mm |
| September | 9.7 °C | 22.1 °C | 91.44 mm |
| October | 2.8 °C | 14.2 °C | 71.88 mm |
| November | -3.8 °C | 5.3 °C | 45.21 mm |
| December | -10.7 °C | -2.1 °C | 35.56 mm |
| Annual | 1.2 °C | 12.4 °C | 860.29 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |