River Hills, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.5 °C (low) to 13.9 °C (high). Annual precipitation averages 892.1 Millimeters. 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 | -9 °C | -1 °C | 43.69 mm |
| February | -7.6 °C | 0.7 °C | 40.64 mm |
| March | -2.8 °C | 6.2 °C | 51.31 mm |
| April | 2.6 °C | 12.6 °C | 101.09 mm |
| May | 8.3 °C | 19.4 °C | 100.58 mm |
| June | 14.1 °C | 24.8 °C | 112.52 mm |
| July | 17.3 °C | 27.7 °C | 91.44 mm |
| August | 17.1 °C | 26.9 °C | 91.69 mm |
| September | 12.8 °C | 23 °C | 81.79 mm |
| October | 6.4 °C | 16.1 °C | 72.9 mm |
| November | 0.1 °C | 8.4 °C | 53.85 mm |
| December | -5.6 °C | 1.9 °C | 50.55 mm |
| Annual | 4.5 °C | 13.9 °C | 892.05 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |