| 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: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 20872 - Damascus, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 27 | 34 | 42 | 52 | 60 | 65 | 63 | 57 | 45 | 37 | 28 | 44 |
| Avg Max Temp (°F) | 39 | 44 | 53 | 64 | 73 | 81 | 85 | 84 | 76 | 65 | 55 | 44 | 64 |
| Avg Precip (In.) | 3.3 | 2.75 | 3.85 | 3.34 | 4.49 | 4.04 | 3.79 | 3.47 | 4.09 | 3.46 | 3.43 | 3.22 | 43.24 |