Addison, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.1 °F (low) to 55.2 °F (high). Annual precipitation averages 35.1 Inches. Addison 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 | 10.3 °F | 26.3 °F | 1.67 in. |
| February | 13.0 °F | 30.0 °F | 1.45 in. |
| March | 23.1 °F | 41.6 °F | 1.97 in. |
| April | 34.3 °F | 54.5 °F | 3.62 in. |
| May | 45.4 °F | 66.6 °F | 3.86 in. |
| June | 55.4 °F | 76.5 °F | 4.45 in. |
| July | 60.0 °F | 80.8 °F | 4.03 in. |
| August | 58.0 °F | 78.9 °F | 3.96 in. |
| September | 50.1 °F | 72.0 °F | 3.33 in. |
| October | 38.9 °F | 58.9 °F | 2.93 in. |
| November | 27.8 °F | 44.5 °F | 2.05 in. |
| December | 17.3 °F | 32.0 °F | 1.81 in. |
| Annual | 36.1 °F | 55.2 °F | 35.13 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 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |