Gresham, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33 °F (low) to 53.8 °F (high). Annual precipitation averages 33.1 Inches. Gresham is located in USDA Plant Hardiness Zone 5a. 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 | 6.3 °F | 24.1 °F | 1.2 in. |
| February | 7.9 °F | 28.3 °F | 1.09 in. |
| March | 18.9 °F | 39.9 °F | 1.75 in. |
| April | 31.4 °F | 53.9 °F | 3.08 in. |
| May | 43.4 °F | 66.7 °F | 3.77 in. |
| June | 53.4 °F | 76.0 °F | 4.47 in. |
| July | 57.5 °F | 80.0 °F | 3.89 in. |
| August | 55.6 °F | 78.1 °F | 3.64 in. |
| September | 47.4 °F | 70.4 °F | 3.65 in. |
| October | 35.8 °F | 56.8 °F | 3.02 in. |
| November | 25.1 °F | 42.1 °F | 1.9 in. |
| December | 13.5 °F | 29.2 °F | 1.59 in. |
| Annual | 33 °F | 53.8 °F | 33.05 in. |
| 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |