| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F |
| 2012 Hardiness Zone: | 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. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 63a - Delaware River Terraces and Uplands |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 19021 - Croydon, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 23 | 24 | 32 | 40 | 50 | 60 | 65 | 64 | 56 | 44 | 36 | 28 | 43 |
| Avg Max Temp (°F) | 41 | 44 | 54 | 65 | 75 | 83 | 88 | 86 | 79 | 68 | 56 | 46 | 65 |
| Avg Precip (In.) | 3.84 | 2.94 | 4.12 | 3.91 | 4.61 | 4.01 | 5.09 | 4.77 | 4.57 | 3.42 | 3.73 | 3.7 | 48.72 |