Merrimac, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.5 °C (low) to 13.8 °C (high). Annual precipitation averages 947.7 Millimeters. Merrimac 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 | -12.4 °C | -2.7 °C | 34.54 mm |
| February | -10.9 °C | -0.2 °C | 34.8 mm |
| March | -5.1 °C | 6.4 °C | 52.83 mm |
| April | 1.5 °C | 13.9 °C | 99.82 mm |
| May | 8.3 °C | 20.8 °C | 110.49 mm |
| June | 14.1 °C | 26.1 °C | 137.92 mm |
| July | 16.2 °C | 28.2 °C | 111.76 mm |
| August | 14.9 °C | 27.1 °C | 108.97 mm |
| September | 10.3 °C | 22.9 °C | 90.93 mm |
| October | 3.8 °C | 15.7 °C | 71.63 mm |
| November | -2.4 °C | 7.2 °C | 52.32 mm |
| December | -8.4 °C | 0.3 °C | 41.66 mm |
| Annual | 2.5 °C | 13.8 °C | 947.67 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |