Princeton, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.5 °C (low) to 18.9 °C (high). Annual precipitation averages 1237.5 Millimeters. Princeton is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.9 °C | 4.2 °C | 90.93 mm |
| February | -3.3 °C | 7.2 °C | 75.95 mm |
| March | 1.2 °C | 12.7 °C | 110.49 mm |
| April | 7.1 °C | 19.4 °C | 130.81 mm |
| May | 12.9 °C | 24.7 °C | 138.18 mm |
| June | 17.8 °C | 29.4 °C | 117.09 mm |
| July | 19.4 °C | 31 °C | 109.73 mm |
| August | 18.4 °C | 30.4 °C | 81.53 mm |
| September | 14.1 °C | 27.3 °C | 96.77 mm |
| October | 7.6 °C | 20.8 °C | 86.87 mm |
| November | 1.8 °C | 12.9 °C | 105.16 mm |
| December | -2.7 °C | 6.6 °C | 93.98 mm |
| Annual | 7.5 °C | 18.9 °C | 1237.49 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |