| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F 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: | 64c - Piedmont Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 19406 - King of Prussia, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 24 | 32 | 41 | 51 | 60 | 65 | 64 | 56 | 44 | 35 | 27 | 43 |
| Avg Max Temp (°F) | 39 | 42 | 51 | 63 | 73 | 82 | 86 | 84 | 77 | 66 | 55 | 43 | 63 |
| Avg Precip (In.) | 3.91 | 2.94 | 3.95 | 3.83 | 4.57 | 3.84 | 4.57 | 4.31 | 4.58 | 3.35 | 3.78 | 3.64 | 47.27 |