Kettering, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.8 °F (low) to 66.4 °F (high). Annual precipitation averages 45.8 Inches. Kettering 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.3 °F | 43.6 °F | 3.05 in. |
| February | 27.7 °F | 46.7 °F | 2.67 in. |
| March | 34.6 °F | 54.7 °F | 3.98 in. |
| April | 44.7 °F | 66.5 °F | 3.44 in. |
| May | 54.4 °F | 74.9 °F | 4.33 in. |
| June | 63.7 °F | 83.5 °F | 4.69 in. |
| July | 68.4 °F | 88.1 °F | 4.59 in. |
| August | 66.6 °F | 86.4 °F | 3.83 in. |
| September | 59.9 °F | 79.8 °F | 4.5 in. |
| October | 47.7 °F | 68.3 °F | 3.89 in. |
| November | 37.4 °F | 57.2 °F | 3.13 in. |
| December | 30.5 °F | 47.6 °F | 3.68 in. |
| Annual | 46.8 °F | 66.4 °F | 45.78 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |