Princeton, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.2 °C (low) to 13.3 °C (high). Annual precipitation averages 884.2 Millimeters. Princeton 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 | -12.7 °C | -3.2 °C | 34.54 mm |
| February | -11.3 °C | -0.9 °C | 31.75 mm |
| March | -5.4 °C | 5.6 °C | 48.51 mm |
| April | 1.1 °C | 13.2 °C | 90.17 mm |
| May | 8.1 °C | 20.1 °C | 105.41 mm |
| June | 13.7 °C | 25.4 °C | 127 mm |
| July | 15.9 °C | 27.7 °C | 103.12 mm |
| August | 14.7 °C | 26.7 °C | 95 mm |
| September | 10.1 °C | 22.6 °C | 84.84 mm |
| October | 3.6 °C | 15.1 °C | 71.37 mm |
| November | -2.9 °C | 6.9 °C | 50.8 mm |
| December | -8.8 °C | -0.2 °C | 41.66 mm |
| Annual | 2.2 °C | 13.3 °C | 884.17 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 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 | Dfb - Humid Continental Mild Summer, Wet All Year |