Princeton, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.9 °F (low) to 55.8 °F (high). Annual precipitation averages 34.8 Inches. 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 | 9.2 °F | 26.3 °F | 1.36 in. |
| February | 11.6 °F | 30.3 °F | 1.25 in. |
| March | 22.2 °F | 42.0 °F | 1.91 in. |
| April | 33.9 °F | 55.7 °F | 3.55 in. |
| May | 46.5 °F | 68.1 °F | 4.15 in. |
| June | 56.6 °F | 77.8 °F | 5.0 in. |
| July | 60.6 °F | 81.9 °F | 4.06 in. |
| August | 58.5 °F | 80.0 °F | 3.74 in. |
| September | 50.1 °F | 72.6 °F | 3.34 in. |
| October | 38.4 °F | 59.2 °F | 2.81 in. |
| November | 26.7 °F | 44.5 °F | 2.0 in. |
| December | 16.1 °F | 31.6 °F | 1.64 in. |
| Annual | 35.9 °F | 55.8 °F | 34.81 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 | Dfb - Humid Continental Mild Summer, Wet All Year |