| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F | |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F | |
| Average First Frost Date: | Oct. 21 - Oct. 31 | |
| Average Last Frost Date: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 64c - Piedmont Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 19380 - West Chester, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 23 | 31 | 40 | 50 | 59 | 64 | 62 | 55 | 43 | 35 | 26 | 42 |
| Avg Max Temp (°F) | 38 | 42 | 51 | 62 | 72 | 80 | 85 | 84 | 77 | 66 | 54 | 43 | 63 |
| Avg Precip (In.) | 3.88 | 2.99 | 3.93 | 3.75 | 4.53 | 4.09 | 4.51 | 3.74 | 4.63 | 3.32 | 3.82 | 3.66 | 46.84 |