Callaway, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49 °F (low) to 66.5 °F (high). Annual precipitation averages 45.8 Inches. Callaway is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.6 °F | 45.2 °F | 3.2 in. |
| February | 30.0 °F | 47.7 °F | 2.85 in. |
| March | 36.5 °F | 55.0 °F | 4.16 in. |
| April | 46.5 °F | 66.1 °F | 3.36 in. |
| May | 56.2 °F | 74.2 °F | 3.89 in. |
| June | 65.1 °F | 82.7 °F | 4.2 in. |
| July | 69.9 °F | 86.8 °F | 4.56 in. |
| August | 68.3 °F | 85.0 °F | 4.3 in. |
| September | 62.2 °F | 79.3 °F | 4.26 in. |
| October | 50.6 °F | 68.5 °F | 4.09 in. |
| November | 40.1 °F | 58.2 °F | 3.22 in. |
| December | 33.4 °F | 49.5 °F | 3.69 in. |
| Annual | 49 °F | 66.5 °F | 45.78 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |