| 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 Zone 6b: -5°F to 0°F | |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 58i - Glaciated Reading Prong | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 07421 - Hewitt, NJ | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 19 | 27 | 37 | 47 | 56 | 61 | 59 | 51 | 39 | 32 | 23 | 39 |
| Avg Max Temp (°F) | 36 | 39 | 48 | 59 | 70 | 78 | 83 | 82 | 74 | 63 | 52 | 41 | 60 |
| Avg Precip (In.) | 4 | 3.01 | 4.26 | 4.29 | 4.76 | 4.15 | 4.35 | 4.23 | 4.61 | 3.84 | 4.17 | 3.9 | 49.55 |