| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 64a - Triassic Lowlands |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 08638 - Trenton, NJ | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 23 | 24 | 32 | 41 | 51 | 60 | 65 | 64 | 57 | 45 | 36 | 28 | 44 |
| Avg Max Temp (°F) | 39 | 41 | 51 | 62 | 72 | 81 | 86 | 84 | 76 | 66 | 54 | 44 | 63 |
| Avg Precip (In.) | 3.83 | 2.85 | 3.97 | 3.88 | 4.55 | 3.86 | 5.06 | 4.41 | 4.52 | 3.5 | 3.75 | 3.75 | 47.93 |