Princeton, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33 °F (low) to 53.8 °F (high). Annual precipitation averages 30.8 Inches. 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 | 3.0 °F | 21.6 °F | 0.71 in. |
| February | 6.3 °F | 26.7 °F | 0.83 in. |
| March | 19.0 °F | 39.4 °F | 1.53 in. |
| April | 32.2 °F | 54.8 °F | 2.7 in. |
| May | 44.9 °F | 67.8 °F | 4.12 in. |
| June | 55.2 °F | 77.2 °F | 4.29 in. |
| July | 59.7 °F | 81.7 °F | 4.19 in. |
| August | 56.8 °F | 79.4 °F | 3.98 in. |
| September | 48.5 °F | 71.9 °F | 3.09 in. |
| October | 36.0 °F | 57.0 °F | 2.81 in. |
| November | 23.6 °F | 40.7 °F | 1.52 in. |
| December | 10.7 °F | 26.8 °F | 1.06 in. |
| Annual | 33 °F | 53.8 °F | 30.83 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |