Odenton, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.8 °C (low) to 19 °C (high). Annual precipitation averages 1194.8 Millimeters. Odenton is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.6 °C | 6.3 °C | 81.53 mm |
| February | -2.7 °C | 7.9 °C | 74.17 mm |
| March | 1 °C | 12.4 °C | 107.19 mm |
| April | 6.5 °C | 19 °C | 90.17 mm |
| May | 11.9 °C | 23.8 °C | 110.74 mm |
| June | 17.1 °C | 28.6 °C | 113.79 mm |
| July | 19.7 °C | 31.1 °C | 116.59 mm |
| August | 18.8 °C | 30 °C | 100.58 mm |
| September | 15 °C | 26.4 °C | 118.62 mm |
| October | 8.2 °C | 20.1 °C | 100.84 mm |
| November | 2.5 °C | 13.9 °C | 81.79 mm |
| December | -1.3 °C | 8.5 °C | 98.81 mm |
| Annual | 7.8 °C | 19 °C | 1194.82 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |