| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°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: | 61c - Low Lime Drift Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 16057 - Slippery Rock, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 16 | 24 | 32 | 42 | 51 | 55 | 54 | 47 | 37 | 29 | 21 | 35 |
| Avg Max Temp (°F) | 34 | 37 | 47 | 59 | 70 | 78 | 82 | 80 | 74 | 62 | 50 | 38 | 59 |
| Avg Precip (In.) | 2.73 | 2.31 | 3.32 | 3.44 | 3.89 | 4.7 | 4.35 | 3.97 | 3.93 | 2.88 | 3.48 | 3.11 | 42.1 |