| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°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: | 69b - Uplands and Valleys of Mixed Land Use | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 21536 - Grantsville, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 18 | 25 | 34 | 44 | 53 | 57 | 56 | 50 | 39 | 30 | 21 | 37 |
| Avg Max Temp (°F) | 34 | 37 | 46 | 57 | 67 | 74 | 77 | 76 | 69 | 60 | 47 | 37 | 57 |
| Avg Precip (In.) | 3.11 | 2.68 | 3.44 | 3.58 | 4.09 | 3.88 | 4.4 | 3.78 | 3.62 | 3.03 | 3.29 | 2.98 | 41.88 |