Arena, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.9 °F (low) to 57.2 °F (high). Annual precipitation averages 36.9 Inches. 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 | 8.9 °F | 27.4 °F | 1.46 in. |
| February | 11.5 °F | 31.7 °F | 1.36 in. |
| March | 22.9 °F | 43.6 °F | 2.01 in. |
| April | 34.7 °F | 57.3 °F | 3.84 in. |
| May | 46.3 °F | 69.6 °F | 4.41 in. |
| June | 57.1 °F | 79.1 °F | 5.28 in. |
| July | 60.6 °F | 82.8 °F | 4.57 in. |
| August | 58.3 °F | 80.9 °F | 4.1 in. |
| September | 49.7 °F | 73.8 °F | 3.3 in. |
| October | 37.8 °F | 61.1 °F | 2.73 in. |
| November | 26.7 °F | 45.6 °F | 2.22 in. |
| December | 16.1 °F | 32.9 °F | 1.59 in. |
| Annual | 35.9 °F | 57.2 °F | 36.87 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |