| 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: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 64d - Piedmont Limestone/Dolomite Lowlands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 21710 - Adamstown, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 26 | 33 | 42 | 52 | 60 | 65 | 64 | 57 | 44 | 36 | 28 | 44 |
| Avg Max Temp (°F) | 41 | 46 | 55 | 67 | 76 | 83 | 88 | 86 | 79 | 68 | 57 | 46 | 66 |
| Avg Precip (In.) | 3.2 | 2.67 | 3.71 | 3.34 | 4.38 | 3.9 | 3.77 | 3.35 | 4.03 | 3.44 | 3.32 | 3.12 | 42.23 |