| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 60b - Northeastern Uplands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 18851 - Warren Center, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 14 | 23 | 33 | 44 | 53 | 57 | 55 | 48 | 37 | 29 | 19 | 35 |
| Avg Max Temp (°F) | 30 | 33 | 42 | 55 | 67 | 75 | 79 | 77 | 70 | 59 | 46 | 35 | 56 |
| Avg Precip (In.) | 2.36 | 2.21 | 2.86 | 3.44 | 3.67 | 4.07 | 3.58 | 3.4 | 3.78 | 3.1 | 3.4 | 2.71 | 38.58 |