| 2023 Hardiness Zone: | 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. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 64a - Triassic Lowlands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 08812 - Dunellen, NJ | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 22 | 30 | 39 | 49 | 58 | 63 | 62 | 54 | 42 | 34 | 26 | 42 |
| Avg Max Temp (°F) | 38 | 42 | 51 | 62 | 72 | 81 | 86 | 84 | 77 | 65 | 54 | 43 | 63 |
| Avg Precip (In.) | 3.99 | 2.94 | 4.09 | 4.03 | 4.63 | 3.91 | 5.11 | 4.35 | 4.56 | 3.73 | 4 | 3.79 | 49.13 |