| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F | |
| 2012 Hardiness Zone: | 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: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate | |
| Ecoregion: | 64c - Piedmont Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 20904 - Silver Spring, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 23 | 25 | 33 | 41 | 51 | 60 | 65 | 64 | 57 | 44 | 36 | 28 | 44 |
| Avg Max Temp (°F) | 42 | 46 | 55 | 66 | 75 | 82 | 86 | 85 | 78 | 67 | 56 | 46 | 65 |
| Avg Precip (In.) | 3.39 | 2.91 | 3.98 | 3.34 | 4.58 | 3.77 | 4.02 | 3.76 | 4.18 | 3.52 | 3.54 | 3.35 | 44.33 |