Rio, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.6 °F (low) to 56.4 °F (high). Annual precipitation averages 36.5 Inches. Rio 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 | 10.1 °F | 26.7 °F | 1.39 in. |
| February | 12.9 °F | 30.9 °F | 1.39 in. |
| March | 23.3 °F | 42.8 °F | 2.03 in. |
| April | 34.9 °F | 56.5 °F | 3.8 in. |
| May | 46.7 °F | 68.9 °F | 4.27 in. |
| June | 56.7 °F | 78.5 °F | 5.31 in. |
| July | 60.9 °F | 82.1 °F | 4.24 in. |
| August | 58.9 °F | 80.3 °F | 3.95 in. |
| September | 50.7 °F | 73.2 °F | 3.47 in. |
| October | 39.0 °F | 60.0 °F | 2.88 in. |
| November | 27.7 °F | 44.8 °F | 2.11 in. |
| December | 16.8 °F | 32.1 °F | 1.68 in. |
| Annual | 36.6 °F | 56.4 °F | 36.52 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 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |