River Hills, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.1 °F (low) to 57 °F (high). Annual precipitation averages 35.1 Inches. River Hills is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.8 °F | 30.2 °F | 1.72 in. |
| February | 18.4 °F | 33.3 °F | 1.6 in. |
| March | 26.9 °F | 43.1 °F | 2.02 in. |
| April | 36.6 °F | 54.6 °F | 3.98 in. |
| May | 47.0 °F | 66.9 °F | 3.96 in. |
| June | 57.3 °F | 76.7 °F | 4.43 in. |
| July | 63.2 °F | 81.8 °F | 3.6 in. |
| August | 62.8 °F | 80.4 °F | 3.61 in. |
| September | 55.0 °F | 73.4 °F | 3.22 in. |
| October | 43.6 °F | 60.9 °F | 2.87 in. |
| November | 32.1 °F | 47.1 °F | 2.12 in. |
| December | 22.0 °F | 35.4 °F | 1.99 in. |
| Annual | 40.1 °F | 57 °F | 35.12 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |