| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F | |
| 2012 Hardiness Zone: | Zone 7b: 5°F to 10°F | |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F | |
| Average First Frost Date: | Nov. 11 - Nov. 20 | |
| Average Last Frost Date: | Apr. 1 - Apr. 10 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate | |
| Ecoregion: | 63b - Chesapeake-Pamlico Lowlands and Tidal Marshes | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 20670 - Patuxent River, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 28 | 29 | 37 | 45 | 56 | 64 | 70 | 68 | 62 | 50 | 41 | 32 | 49 |
| Avg Max Temp (°F) | 43 | 47 | 55 | 66 | 75 | 83 | 87 | 86 | 79 | 68 | 58 | 49 | 66 |
| Avg Precip (In.) | 3.77 | 3.11 | 4.27 | 3.27 | 4.19 | 3.66 | 4.3 | 4.06 | 4.1 | 3.41 | 3.28 | 3.33 | 44.75 |