| 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 |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 70c - Pittsburgh Low Plateau |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 16002 - Butler, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 17 | 25 | 34 | 44 | 53 | 58 | 57 | 50 | 38 | 30 | 22 | 37 |
| Avg Max Temp (°F) | 35 | 38 | 48 | 60 | 71 | 79 | 82 | 81 | 74 | 63 | 50 | 39 | 60 |
| Avg Precip (In.) | 2.76 | 2.34 | 3.21 | 3.34 | 4.02 | 4.42 | 4.19 | 3.83 | 3.72 | 2.71 | 3.34 | 3.06 | 40.94 |