| 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. 21 - Oct. 31 | |
| 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: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 21701 - Frederick, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 25 | 27 | 34 | 43 | 53 | 62 | 66 | 65 | 58 | 46 | 37 | 29 | 45 |
| Avg Max Temp (°F) | 41 | 45 | 55 | 67 | 76 | 84 | 88 | 86 | 79 | 68 | 56 | 46 | 66 |
| Avg Precip (In.) | 3.34 | 2.69 | 3.75 | 3.43 | 4.49 | 3.98 | 3.71 | 3.2 | 4.07 | 3.6 | 3.38 | 3.2 | 42.84 |