| 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. 11 - Oct. 20 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 64a - Triassic Lowlands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 18914 - Chalfont, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 22 | 30 | 39 | 49 | 58 | 63 | 62 | 54 | 42 | 34 | 26 | 42 |
| Avg Max Temp (°F) | 38 | 41 | 51 | 62 | 72 | 81 | 86 | 84 | 76 | 65 | 54 | 43 | 63 |
| Avg Precip (In.) | 3.74 | 2.66 | 3.68 | 3.69 | 4.56 | 3.98 | 4.53 | 4.01 | 4.48 | 3.53 | 3.73 | 3.37 | 45.95 |