Green Valley, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.1 °F (low) to 54.5 °F (high). Annual precipitation averages 32.9 Inches. Green Valley 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 | 7.8 °F | 25.2 °F | 1.45 in. |
| February | 9.3 °F | 28.9 °F | 1.18 in. |
| March | 20.0 °F | 40.3 °F | 1.8 in. |
| April | 32.2 °F | 54.1 °F | 3.29 in. |
| May | 44.1 °F | 67.0 °F | 3.62 in. |
| June | 54.2 °F | 76.3 °F | 4.36 in. |
| July | 58.5 °F | 80.8 °F | 3.61 in. |
| August | 56.5 °F | 78.9 °F | 3.6 in. |
| September | 48.3 °F | 71.5 °F | 3.5 in. |
| October | 36.8 °F | 57.8 °F | 3.03 in. |
| November | 26.3 °F | 43.2 °F | 1.79 in. |
| December | 14.9 °F | 30.1 °F | 1.7 in. |
| Annual | 34.1 °F | 54.5 °F | 32.93 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 |