| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | May 21 - May 31 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 67b - Northern Shale Valleys | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 17701 - Williamsport, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 18 | 26 | 36 | 46 | 55 | 60 | 59 | 51 | 39 | 31 | 22 | 38 |
| Avg Max Temp (°F) | 33 | 37 | 47 | 60 | 71 | 78 | 83 | 81 | 73 | 62 | 49 | 38 | 59 |
| Avg Precip (In.) | 2.96 | 2.71 | 3.33 | 3.6 | 3.85 | 4.55 | 4.2 | 3.47 | 4.08 | 3.33 | 3.73 | 3.08 | 42.9 |