Reserve, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1 °C (low) to 11.2 °C (high). Annual precipitation averages 910.6 Millimeters. Reserve is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.1 °C | -6 °C | 27.94 mm |
| February | -15.8 °C | -2.9 °C | 29.72 mm |
| March | -9.1 °C | 3.8 °C | 44.2 mm |
| April | -1.8 °C | 11.4 °C | 80.26 mm |
| May | 5 °C | 18.9 °C | 105.16 mm |
| June | 10.6 °C | 23.9 °C | 119.89 mm |
| July | 13.1 °C | 26.1 °C | 114.55 mm |
| August | 11.8 °C | 24.8 °C | 104.9 mm |
| September | 7.7 °C | 20.7 °C | 103.12 mm |
| October | 1.3 °C | 12.8 °C | 90.93 mm |
| November | -5.2 °C | 4.1 °C | 51.31 mm |
| December | -12.4 °C | -3.2 °C | 38.61 mm |
| Annual | -1 °C | 11.2 °C | 910.59 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |