| 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. 21 - Oct. 31 | |
| Average Last Frost Date: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 67b - Northern Shale Valleys | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 21795 - Williamsport, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 23 | 32 | 40 | 50 | 59 | 64 | 61 | 54 | 42 | 34 | 26 | 42 |
| Avg Max Temp (°F) | 39 | 44 | 54 | 65 | 75 | 83 | 87 | 85 | 78 | 67 | 55 | 44 | 65 |
| Avg Precip (In.) | 2.79 | 2.4 | 3.29 | 3.27 | 4.05 | 3.66 | 3.4 | 3.38 | 3.48 | 3.34 | 3.19 | 2.79 | 39.04 |