Campbellsport, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.3 °C (low) to 12.8 °C (high). Annual precipitation averages 870 Millimeters. Campbellsport 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 | -12.1 °C | -3.3 °C | 38.86 mm |
| February | -10.6 °C | -1.2 °C | 34.8 mm |
| March | -5.1 °C | 5.2 °C | 49.02 mm |
| April | 1.2 °C | 12.3 °C | 90.68 mm |
| May | 7.6 °C | 19.2 °C | 96.52 mm |
| June | 13.1 °C | 24.7 °C | 110.74 mm |
| July | 15.6 °C | 27.1 °C | 101.6 mm |
| August | 14.7 °C | 26.1 °C | 97.79 mm |
| September | 10.3 °C | 22.2 °C | 82.55 mm |
| October | 3.8 °C | 14.9 °C | 73.41 mm |
| November | -2.4 °C | 6.8 °C | 50.29 mm |
| December | -8.3 °C | -0.1 °C | 43.69 mm |
| Annual | 2.3 °C | 12.8 °C | 869.95 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |