| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 69b - Uplands and Valleys of Mixed Land Use |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 21531 - Friendsville, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 19 | 26 | 35 | 45 | 54 | 58 | 57 | 50 | 39 | 30 | 22 | 38 |
| Avg Max Temp (°F) | 35 | 39 | 48 | 60 | 69 | 77 | 80 | 79 | 73 | 61 | 50 | 39 | 59 |
| Avg Precip (In.) | 3.61 | 3.12 | 3.98 | 4.03 | 4.58 | 4.44 | 5.04 | 4.14 | 3.87 | 3.09 | 3.7 | 3.67 | 47.27 |