| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 69b - Uplands and Valleys of Mixed Land Use |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 15424 - Confluence, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 18 | 25 | 34 | 44 | 53 | 58 | 56 | 50 | 38 | 29 | 21 | 37 |
| Avg Max Temp (°F) | 35 | 39 | 48 | 60 | 70 | 78 | 82 | 80 | 74 | 62 | 50 | 39 | 60 |
| Avg Precip (In.) | 3.53 | 2.99 | 3.85 | 4.01 | 4.36 | 4.19 | 4.86 | 3.75 | 4.07 | 2.97 | 3.63 | 3.45 | 45.67 |