| 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 |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 08880 - South Bound Brook, NJ | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 21 | 30 | 39 | 49 | 58 | 63 | 62 | 54 | 42 | 34 | 26 | 41 |
| Avg Max Temp (°F) | 38 | 41 | 50 | 61 | 72 | 80 | 85 | 83 | 76 | 65 | 54 | 43 | 62 |
| Avg Precip (In.) | 3.76 | 2.7 | 3.93 | 3.9 | 4.37 | 3.72 | 4.87 | 4.33 | 4.39 | 3.53 | 3.75 | 3.66 | 46.91 |