Athens, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.8 °C (low) to 15.3 °C (high). Annual precipitation averages 922.6 Millimeters. Athens is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.1 °C | 1 °C | 57.15 mm |
| February | -8.8 °C | 2.3 °C | 46.74 mm |
| March | -4.7 °C | 7.1 °C | 71.12 mm |
| April | 0.9 °C | 14.8 °C | 86.11 mm |
| May | 7.2 °C | 21.6 °C | 75.95 mm |
| June | 12.3 °C | 26.2 °C | 102.62 mm |
| July | 14.7 °C | 28.6 °C | 89.15 mm |
| August | 14.1 °C | 27.8 °C | 84.58 mm |
| September | 10.2 °C | 23.9 °C | 98.81 mm |
| October | 3.8 °C | 16.6 °C | 89.92 mm |
| November | -1.3 °C | 9.7 °C | 61.47 mm |
| December | -5.3 °C | 3.7 °C | 58.93 mm |
| Annual | 2.8 °C | 15.3 °C | 922.55 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |