Princeton, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.9 °F (low) to 68.8 °F (high). Annual precipitation averages 50.7 Inches. Princeton is located in USDA Plant Hardiness Zone 7a. 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 | 26.9 °F | 44.8 °F | 3.77 in. |
| February | 29.8 °F | 49.5 °F | 3.97 in. |
| March | 37.7 °F | 59.0 °F | 4.65 in. |
| April | 47.2 °F | 70.1 °F | 5.08 in. |
| May | 57.0 °F | 78.2 °F | 5.21 in. |
| June | 65.4 °F | 85.7 °F | 4.74 in. |
| July | 68.7 °F | 88.7 °F | 4.28 in. |
| August | 66.9 °F | 88.5 °F | 3.06 in. |
| September | 59.4 °F | 83.2 °F | 3.28 in. |
| October | 48.0 °F | 71.5 °F | 3.86 in. |
| November | 37.6 °F | 58.8 °F | 4.06 in. |
| December | 30.4 °F | 48.1 °F | 4.72 in. |
| Annual | 47.9 °F | 68.8 °F | 50.68 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |