Callaghan, Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 41.8 °F (low) to 65.7 °F (high). Annual precipitation averages 41.3 Inches. Callaghan is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.0 °F | 42.8 °F | 2.94 in. |
| February | 24.8 °F | 46.9 °F | 2.65 in. |
| March | 30.8 °F | 55.5 °F | 3.48 in. |
| April | 39.8 °F | 67.7 °F | 3.75 in. |
| May | 49.1 °F | 75.5 °F | 4.4 in. |
| June | 57.3 °F | 81.8 °F | 4.15 in. |
| July | 61.4 °F | 85.4 °F | 3.95 in. |
| August | 60.7 °F | 83.9 °F | 3.38 in. |
| September | 54.0 °F | 78.3 °F | 3.8 in. |
| October | 42.1 °F | 68.2 °F | 2.92 in. |
| November | 31.7 °F | 56.4 °F | 2.7 in. |
| December | 26.4 °F | 46.5 °F | 3.2 in. |
| Annual | 41.8 °F | 65.7 °F | 41.32 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |