Montreal, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.2 °C (low) to 10 °C (high). Annual precipitation averages 926.3 Millimeters. Montreal is located in USDA Plant Hardiness Zone 4b. 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 | -16.7 °C | -6.7 °C | 50.8 mm |
| February | -16.2 °C | -4.1 °C | 36.07 mm |
| March | -10.4 °C | 2.2 °C | 46.23 mm |
| April | -2.7 °C | 9.3 °C | 74.93 mm |
| May | 5 °C | 17.4 °C | 93.22 mm |
| June | 10.7 °C | 22.7 °C | 101.09 mm |
| July | 13.2 °C | 24.8 °C | 109.47 mm |
| August | 11.8 °C | 23.8 °C | 95.5 mm |
| September | 7.7 °C | 19.4 °C | 97.28 mm |
| October | 0.9 °C | 11.4 °C | 97.54 mm |
| November | -5.5 °C | 2.9 °C | 67.06 mm |
| December | -12.1 °C | -3.6 °C | 57.15 mm |
| Annual | -1.2 °C | 10 °C | 926.34 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |