Fredonia, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.8 °F (low) to 59.4 °F (high). Annual precipitation averages 44.3 Inches. Fredonia is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.5 °F | 34.0 °F | 3.2 in. |
| February | 18.1 °F | 36.8 °F | 2.43 in. |
| March | 25.7 °F | 46.0 °F | 3.19 in. |
| April | 36.3 °F | 59.7 °F | 4.03 in. |
| May | 46.8 °F | 70.2 °F | 3.88 in. |
| June | 55.7 °F | 78.2 °F | 4.8 in. |
| July | 59.6 °F | 82.1 °F | 4.68 in. |
| August | 58.1 °F | 80.7 °F | 3.86 in. |
| September | 51.4 °F | 74.6 °F | 4.21 in. |
| October | 40.9 °F | 62.3 °F | 3.45 in. |
| November | 31.9 °F | 49.4 °F | 3.25 in. |
| December | 23.8 °F | 38.7 °F | 3.34 in. |
| Annual | 38.8 °F | 59.4 °F | 44.32 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |