Readstown, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 13.6 °C (high). Annual precipitation averages 989.8 Millimeters. Readstown 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 | -13.3 °C | -3.2 °C | 29.97 mm |
| February | -11.4 °C | -0.6 °C | 33.02 mm |
| March | -5.2 °C | 6.3 °C | 52.07 mm |
| April | 1.4 °C | 14 °C | 103.12 mm |
| May | 7.7 °C | 20.7 °C | 121.92 mm |
| June | 13.5 °C | 25.9 °C | 147.32 mm |
| July | 15.8 °C | 27.9 °C | 119.89 mm |
| August | 14.6 °C | 26.9 °C | 111.51 mm |
| September | 9.7 °C | 22.8 °C | 106.17 mm |
| October | 3 °C | 15.7 °C | 69.09 mm |
| November | -3.3 °C | 7 °C | 54.61 mm |
| December | -9.4 °C | -0.1 °C | 41.15 mm |
| Annual | 1.9 °C | 13.6 °C | 989.84 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 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |