| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| 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: | 67b - Northern Shale Valleys |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 17846 - Millville, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 16 | 25 | 35 | 45 | 53 | 58 | 57 | 49 | 38 | 30 | 21 | 37 |
| Avg Max Temp (°F) | 33 | 36 | 46 | 58 | 70 | 77 | 82 | 80 | 72 | 61 | 49 | 37 | 58 |
| Avg Precip (In.) | 2.84 | 2.45 | 3.18 | 3.49 | 3.89 | 4.99 | 4.07 | 3.39 | 4.51 | 3.27 | 3.42 | 3.02 | 42.52 |