Emerald, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.5 °C (low) to 11.5 °C (high). Annual precipitation averages 856.7 Millimeters. Emerald is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.9 °C | -5.8 °C | 23.62 mm |
| February | -14.2 °C | -3 °C | 23.11 mm |
| March | -7.2 °C | 3.8 °C | 42.67 mm |
| April | -0.1 °C | 11.9 °C | 75.18 mm |
| May | 7 °C | 19 °C | 103.12 mm |
| June | 12.8 °C | 24.2 °C | 128.78 mm |
| July | 14.9 °C | 26.6 °C | 108.2 mm |
| August | 13.6 °C | 25.4 °C | 114.81 mm |
| September | 9.1 °C | 21.3 °C | 89.66 mm |
| October | 2.1 °C | 13.3 °C | 72.39 mm |
| November | -4.4 °C | 4.6 °C | 43.18 mm |
| December | -11.7 °C | -2.9 °C | 32 mm |
| Annual | 0.5 °C | 11.5 °C | 856.72 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |