| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F | |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 64f - Passaic Basin Freshwater Wetlands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 07928 - Chatham, 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 | 34 | 25 | 41 |
| Avg Max Temp (°F) | 38 | 41 | 50 | 62 | 72 | 81 | 86 | 84 | 76 | 66 | 54 | 43 | 63 |
| Avg Precip (In.) | 4.1 | 3.01 | 4.14 | 4.24 | 4.76 | 4.23 | 4.81 | 4.53 | 4.91 | 4.03 | 4.29 | 3.88 | 50.93 |