Princeton, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.6 °C (low) to 12.1 °C (high). Annual precipitation averages 783.1 Millimeters. Princeton 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.1 °C | -5.8 °C | 18.03 mm |
| February | -14.3 °C | -2.9 °C | 21.08 mm |
| March | -7.2 °C | 4.1 °C | 38.86 mm |
| April | 0.1 °C | 12.7 °C | 68.58 mm |
| May | 7.2 °C | 19.9 °C | 104.65 mm |
| June | 12.9 °C | 25.1 °C | 108.97 mm |
| July | 15.4 °C | 27.6 °C | 106.43 mm |
| August | 13.8 °C | 26.3 °C | 101.09 mm |
| September | 9.2 °C | 22.2 °C | 78.49 mm |
| October | 2.2 °C | 13.9 °C | 71.37 mm |
| November | -4.7 °C | 4.8 °C | 38.61 mm |
| December | -11.8 °C | -2.9 °C | 26.92 mm |
| Annual | 0.6 °C | 12.1 °C | 783.08 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |