Harveys Lake, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.9 °F (low) to 58.1 °F (high). Annual precipitation averages 48.2 Inches. Harveys Lake 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.9 °F | 33.2 °F | 3.65 in. |
| February | 17.4 °F | 35.8 °F | 2.6 in. |
| March | 24.7 °F | 44.1 °F | 3.31 in. |
| April | 35.6 °F | 57.5 °F | 4.27 in. |
| May | 46.0 °F | 68.8 °F | 3.94 in. |
| June | 55.0 °F | 76.7 °F | 5.2 in. |
| July | 59.2 °F | 81.6 °F | 4.4 in. |
| August | 57.4 °F | 79.6 °F | 4.39 in. |
| September | 50.4 °F | 72.9 °F | 4.85 in. |
| October | 39.6 °F | 60.4 °F | 4.74 in. |
| November | 30.8 °F | 48.8 °F | 3.16 in. |
| December | 22.7 °F | 38.1 °F | 3.68 in. |
| Annual | 37.9 °F | 58.1 °F | 48.19 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |