Oliver, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.1 °C (low) to 10.4 °C (high). Annual precipitation averages 788.7 Millimeters. 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 | -15.6 °C | -5.6 °C | 24.38 mm |
| February | -13.9 °C | -2.8 °C | 23.37 mm |
| March | -7.7 °C | 2.7 °C | 36.32 mm |
| April | -1.1 °C | 8.7 °C | 65.53 mm |
| May | 3.9 °C | 16.1 °C | 86.87 mm |
| June | 9.1 °C | 21.3 °C | 109.73 mm |
| July | 13.7 °C | 25 °C | 104.39 mm |
| August | 13.4 °C | 24.6 °C | 95.25 mm |
| September | 8.9 °C | 19.9 °C | 85.6 mm |
| October | 2.8 °C | 12.7 °C | 76.45 mm |
| November | -3.7 °C | 4.4 °C | 46.23 mm |
| December | -11.2 °C | -2.8 °C | 34.54 mm |
| Annual | -0.1 °C | 10.4 °C | 788.66 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |