Port Republic, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 43.6 °F (low) to 66.3 °F (high). Annual precipitation averages 40.7 Inches. Port Republic is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.8 °F | 44.1 °F | 2.9 in. |
| February | 26.0 °F | 47.5 °F | 2.28 in. |
| March | 32.0 °F | 55.5 °F | 3.3 in. |
| April | 41.7 °F | 67.1 °F | 3.28 in. |
| May | 51.6 °F | 74.9 °F | 3.85 in. |
| June | 60.5 °F | 82.9 °F | 4.13 in. |
| July | 64.4 °F | 86.4 °F | 3.96 in. |
| August | 62.7 °F | 85.0 °F | 3.48 in. |
| September | 55.7 °F | 78.7 °F | 4.52 in. |
| October | 43.7 °F | 68.3 °F | 3.05 in. |
| November | 33.3 °F | 57.1 °F | 2.94 in. |
| December | 27.2 °F | 47.5 °F | 2.99 in. |
| Annual | 43.6 °F | 66.3 °F | 40.68 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Cfa - Humid Subtropical Climate |