Arena, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.2 °C (low) to 14 °C (high). Annual precipitation averages 936.5 Millimeters. Arena is located in USDA Plant Hardiness Zone 5a. 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 | -12.8 °C | -2.6 °C | 37.08 mm |
| February | -11.4 °C | -0.2 °C | 34.54 mm |
| March | -5.1 °C | 6.4 °C | 51.05 mm |
| April | 1.5 °C | 14.1 °C | 97.54 mm |
| May | 7.9 °C | 20.9 °C | 112.01 mm |
| June | 13.9 °C | 26.2 °C | 134.11 mm |
| July | 15.9 °C | 28.2 °C | 116.08 mm |
| August | 14.6 °C | 27.2 °C | 104.14 mm |
| September | 9.8 °C | 23.2 °C | 83.82 mm |
| October | 3.2 °C | 16.2 °C | 69.34 mm |
| November | -2.9 °C | 7.6 °C | 56.39 mm |
| December | -8.8 °C | 0.5 °C | 40.39 mm |
| Annual | 2.2 °C | 14 °C | 936.49 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |