Gilman, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.7 °F (low) to 52.9 °F (high). Annual precipitation averages 32.7 Inches. Gilman is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.7 °F | 22.0 °F | 1.06 in. |
| February | 5.0 °F | 27.0 °F | 0.98 in. |
| March | 17.5 °F | 39.3 °F | 1.59 in. |
| April | 31.0 °F | 53.6 °F | 2.9 in. |
| May | 43.2 °F | 66.5 °F | 3.78 in. |
| June | 53.0 °F | 75.5 °F | 4.68 in. |
| July | 57.0 °F | 79.7 °F | 3.76 in. |
| August | 54.5 °F | 77.6 °F | 4.12 in. |
| September | 46.6 °F | 69.8 °F | 3.63 in. |
| October | 35.0 °F | 56.1 °F | 2.98 in. |
| November | 23.5 °F | 40.2 °F | 1.84 in. |
| December | 10.9 °F | 27.4 °F | 1.34 in. |
| Annual | 31.7 °F | 52.9 °F | 32.66 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |