| 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 6b: -5F to 0F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | May 1 - May 10 | |
| 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 07834 - Denville, NJ | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 19 | 28 | 37 | 47 | 56 | 61 | 59 | 51 | 39 | 32 | 23 | 39 |
| Avg Max Temp (°F) | 37 | 40 | 49 | 60 | 71 | 79 | 84 | 82 | 75 | 64 | 53 | 42 | 61 |
| Avg Precip (In.) | 4.16 | 3.01 | 4.27 | 4.43 | 4.92 | 4.37 | 4.86 | 4.31 | 5.05 | 4.01 | 4.27 | 3.93 | 51.61 |