| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F 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: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 58h - Reading Prong | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 08826 - Glen Gardner, NJ | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 19 | 27 | 36 | 46 | 55 | 60 | 59 | 51 | 39 | 32 | 23 | 39 |
| Avg Max Temp (°F) | 37 | 40 | 49 | 61 | 71 | 79 | 84 | 82 | 74 | 64 | 53 | 41 | 61 |
| Avg Precip (In.) | 4.12 | 3 | 4.04 | 4.29 | 4.88 | 4.49 | 4.86 | 4.39 | 4.77 | 3.87 | 4.15 | 3.89 | 50.73 |