| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F | |
| 2012 Hardiness Zone: | Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F | |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F | |
| Average First Frost Date: | November 1 - 10 | |
| Average Last Frost Date: | April 1 - 10 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 64c - Piedmont Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 19081 - Swarthmore, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 25 | 26 | 34 | 43 | 53 | 62 | 68 | 66 | 59 | 47 | 38 | 29 | 46 |
| Avg Max Temp (°F) | 39 | 42 | 52 | 63 | 73 | 81 | 86 | 84 | 77 | 66 | 55 | 44 | 64 |
| Avg Precip (In.) | 3.65 | 2.88 | 3.98 | 3.69 | 4.22 | 3.69 | 4.4 | 3.98 | 4.21 | 3.11 | 3.48 | 3.5 | 44.78 |