Last updated: June 24, 2025
In December, the average temperature in Rock Hill, United States hovers around 0°C (32°F), with a minimum dip of -18°C (0°F) and a maximum rise to 16°C (61°F). Expect 126 mm (4.9 in) of precipitation spread over 11 days, contributing to an average humidity of 80%. Stay prepared for a chilly and damp month!
In December in Rock Hill, the average temperature is 0°C (32°F). The maximum can reach 16°C (61°F), while the minimum can drop as low as -18°C (0°F). Be sure to pack warm clothing if you're planning to visit during this time.
In Rock Hill in December, the precipitation amount is 126 mm (4.9 in) over the course of 11 days.
In Rock Hill in December humidity is 80%. With an average temperature of 0°C (32°F), this humidity feels like a damp chill clinging to your skin, making every step outside feel uncomfortable and the air heavy, potentially deterring travelers who are unaccustomed to such conditions.
In Rock Hill in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Rock Hill, you can visit Hourly UV Index in Rock Hill.
UV Risk Categories
Weather in Rock Hill varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Rock Hill, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 88 mm (3.5 inches) | 84% | moderate |
| February Weather | -1°C (30°F) | 115 mm (4.5 inches) | 82% | moderate |
| March Weather | 2°C (36°F) | 101 mm (4.0 inches) | 81% | high |
| April Weather | 8°C (47°F) | 143 mm (5.6 inches) | 78% | very high |
| May Weather | 14°C (58°F) | 150 mm (5.9 inches) | 69% | very high |
| June Weather | 19°C (66°F) | 124 mm (4.9 inches) | 69% | very high |
| July Weather | 22°C (72°F) | 141 mm (5.6 inches) | 62% | very high |
| August Weather | 21°C (70°F) | 136 mm (5.4 inches) | 65% | very high |
| September Weather | 18°C (64°F) | 103 mm (4.0 inches) | 68% | very high |
| October Weather | 12°C (54°F) | 164 mm (6.4 inches) | 74% | high |
| November Weather | 4°C (39°F) | 110 mm (4.3 inches) | 82% | moderate |
| December Weather | 0°C (32°F) | 126 mm (4.9 inches) | 80% | low |