| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°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: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 67a - Northern Limestone/Dolomite Valleys | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 07840 - Hackettstown, NJ | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 18 | 26 | 35 | 45 | 54 | 59 | 58 | 50 | 38 | 31 | 22 | 38 |
| Avg Max Temp (°F) | 36 | 39 | 48 | 60 | 70 | 78 | 82 | 80 | 73 | 63 | 52 | 41 | 60 |
| Avg Precip (In.) | 4.16 | 3 | 4.13 | 4.43 | 4.93 | 4.64 | 4.92 | 4.45 | 4.96 | 3.96 | 4.24 | 3.94 | 51.76 |