| 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 20874 - Germantown, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 26 | 33 | 42 | 51 | 60 | 65 | 63 | 56 | 44 | 36 | 28 | 44 |
| Avg Max Temp (°F) | 40 | 45 | 54 | 66 | 74 | 82 | 86 | 84 | 78 | 67 | 56 | 45 | 65 |
| Avg Precip (In.) | 3.16 | 2.72 | 3.75 | 3.25 | 4.38 | 3.83 | 3.81 | 3.51 | 4.1 | 3.36 | 3.32 | 3.12 | 42.32 |