Confluence, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.5 °C (low) to 16.1 °C (high). Annual precipitation averages 1214.6 Millimeters. 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 | -7.6 °C | 2.6 °C | 92.71 mm |
| February | -6.8 °C | 4.5 °C | 86.87 mm |
| March | -3.1 °C | 9.3 °C | 100.33 mm |
| April | 2.3 °C | 16.6 °C | 103.38 mm |
| May | 7.9 °C | 21.8 °C | 125.98 mm |
| June | 12.7 °C | 26 °C | 126.75 mm |
| July | 14.9 °C | 28 °C | 116.59 mm |
| August | 14.1 °C | 27.3 °C | 104.9 mm |
| September | 10.1 °C | 23.9 °C | 98.04 mm |
| October | 3.9 °C | 17.6 °C | 83.82 mm |
| November | -1.3 °C | 10.6 °C | 78.49 mm |
| December | -4.8 °C | 4.9 °C | 96.77 mm |
| Annual | 3.5 °C | 16.1 °C | 1214.63 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 |