Stanley, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.5 °C (low) to 11.8 °C (high). Annual precipitation averages 817.1 Millimeters. Stanley is located in USDA Plant Hardiness Zone 4b. 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 | -15.6 °C | -5.4 °C | 24.13 mm |
| February | -14 °C | -2.7 °C | 24.13 mm |
| March | -7.1 °C | 4.2 °C | 41.66 mm |
| April | 0.2 °C | 12.2 °C | 76.2 mm |
| May | 6.9 °C | 19.3 °C | 97.54 mm |
| June | 12.5 °C | 24.4 °C | 114.3 mm |
| July | 14.7 °C | 26.7 °C | 99.06 mm |
| August | 13.4 °C | 25.6 °C | 106.17 mm |
| September | 8.8 °C | 21.2 °C | 86.61 mm |
| October | 2.2 °C | 13.7 °C | 66.29 mm |
| November | -4.3 °C | 4.9 °C | 48.26 mm |
| December | -11.3 °C | -2.4 °C | 32.77 mm |
| Annual | 0.5 °C | 11.8 °C | 817.12 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |