Oliver, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.8 °F (low) to 50.6 °F (high). Annual precipitation averages 31.1 Inches. Oliver is located in USDA Plant Hardiness Zone 4b. 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 | 4.0 °F | 21.9 °F | 0.96 in. |
| February | 6.9 °F | 27.0 °F | 0.92 in. |
| March | 18.1 °F | 36.8 °F | 1.43 in. |
| April | 30.1 °F | 47.7 °F | 2.58 in. |
| May | 39.1 °F | 61.0 °F | 3.42 in. |
| June | 48.3 °F | 70.4 °F | 4.32 in. |
| July | 56.6 °F | 77.0 °F | 4.11 in. |
| August | 56.2 °F | 76.3 °F | 3.75 in. |
| September | 48.0 °F | 67.8 °F | 3.37 in. |
| October | 37.0 °F | 54.8 °F | 3.01 in. |
| November | 25.3 °F | 39.9 °F | 1.82 in. |
| December | 11.9 °F | 27.0 °F | 1.36 in. |
| Annual | 31.8 °F | 50.6 °F | 31.05 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 4b : -25°F to -20°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 |