Reserve, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.2 °F (low) to 52.2 °F (high). Annual precipitation averages 35.9 Inches. 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 | 1.2 °F | 21.2 °F | 1.1 in. |
| February | 3.5 °F | 26.7 °F | 1.17 in. |
| March | 15.7 °F | 38.9 °F | 1.74 in. |
| April | 28.8 °F | 52.5 °F | 3.16 in. |
| May | 41.0 °F | 66.1 °F | 4.14 in. |
| June | 51.0 °F | 75.1 °F | 4.72 in. |
| July | 55.5 °F | 79.0 °F | 4.51 in. |
| August | 53.2 °F | 76.7 °F | 4.13 in. |
| September | 45.9 °F | 69.2 °F | 4.06 in. |
| October | 34.3 °F | 55.0 °F | 3.58 in. |
| November | 22.6 °F | 39.3 °F | 2.02 in. |
| December | 9.7 °F | 26.3 °F | 1.52 in. |
| Annual | 30.2 °F | 52.2 °F | 35.85 in. |
| 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 : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |