| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F 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: | 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 08876 - Somerville, NJ | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 21 | 29 | 38 | 48 | 57 | 62 | 61 | 53 | 41 | 33 | 25 | 40 |
| Avg Max Temp (°F) | 37 | 40 | 50 | 61 | 72 | 80 | 85 | 83 | 75 | 64 | 53 | 42 | 62 |
| Avg Precip (In.) | 3.93 | 2.8 | 3.93 | 3.99 | 4.45 | 3.92 | 4.76 | 4.34 | 4.53 | 3.62 | 3.76 | 3.65 | 47.69 |