| 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: | Nov. 1 - Nov. 10 | |
| Average Last Frost Date: | Apr. 11 - Apr. 20 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 64e - Glaciated Triassic Lowlands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 07083 - Union, NJ | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 23 | 31 | 40 | 50 | 59 | 65 | 63 | 56 | 44 | 36 | 27 | 43 |
| Avg Max Temp (°F) | 38 | 41 | 51 | 61 | 72 | 81 | 85 | 83 | 76 | 65 | 54 | 43 | 63 |
| Avg Precip (In.) | 4.03 | 3.01 | 4.2 | 4.14 | 4.67 | 3.89 | 4.84 | 4.33 | 4.59 | 3.76 | 4.15 | 3.82 | 49.42 |