Confluence, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.4 °F (low) to 61 °F (high). Annual precipitation averages 47.8 Inches. Confluence 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 | 18.4 °F | 36.7 °F | 3.65 in. |
| February | 19.8 °F | 40.1 °F | 3.42 in. |
| March | 26.5 °F | 48.8 °F | 3.95 in. |
| April | 36.1 °F | 61.9 °F | 4.07 in. |
| May | 46.3 °F | 71.2 °F | 4.96 in. |
| June | 54.8 °F | 78.8 °F | 4.99 in. |
| July | 58.8 °F | 82.4 °F | 4.59 in. |
| August | 57.4 °F | 81.2 °F | 4.13 in. |
| September | 50.2 °F | 75.1 °F | 3.86 in. |
| October | 39.1 °F | 63.6 °F | 3.3 in. |
| November | 29.6 °F | 51.1 °F | 3.09 in. |
| December | 23.4 °F | 40.9 °F | 3.81 in. |
| Annual | 38.4 °F | 61 °F | 47.82 in. |
| 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 : -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 |