| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 70b - Monongahela Transition Zone |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 15106 - Carnegie, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 23 | 31 | 40 | 50 | 59 | 63 | 62 | 55 | 44 | 35 | 26 | 42 |
| Avg Max Temp (°F) | 36 | 39 | 50 | 61 | 72 | 80 | 83 | 82 | 75 | 64 | 51 | 41 | 61 |
| Avg Precip (In.) | 2.62 | 2.38 | 3.12 | 3.19 | 3.89 | 3.82 | 4.05 | 3.35 | 3.38 | 2.34 | 3.04 | 2.85 | 38.02 |