Last updated: June 24, 2025
In Mount Holly, United States, the average temperature in December is a chilly -4°C (25°F). However, it can swing dramatically, with minimums dipping as low as -26°C (-15°F) and maximums reaching up to 14°C (57°F). During this month, expect around 99 mm (3.9 in) of precipitation spread over 11 days, while the average humidity hovers at a brisk 84%.
In December in Mount Holly, the average temperature is -4°C (25°F). Maximums can reach 14°C (57°F) and minimums can be as low as -26°C (-15°F). It's advisable to pack warm clothing and be prepared for fluctuating temperatures if you plan to travel during this time.
In Mount Holly, in December, the precipitation amount is 99 mm (3.9 in) over the course of 11 days.
In Mount Holly in December, humidity is 84%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that seeps into your bones, making outdoor activities uncomfortable and travel less enjoyable.
In Mount Holly 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 Mount Holly, you can visit Hourly UV Index in Mount Holly.
UV Risk Categories
Weather in Mount Holly varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mount Holly, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (20°F) | 78 mm (3.1 inches) | 89% | moderate |
| February Weather | -5°C (23°F) | 89 mm (3.5 inches) | 88% | moderate |
| March Weather | -1°C (30°F) | 79 mm (3.1 inches) | 86% | high |
| April Weather | 6°C (42°F) | 129 mm (5.1 inches) | 84% | very high |
| May Weather | 13°C (55°F) | 101 mm (4.0 inches) | 76% | very high |
| June Weather | 18°C (64°F) | 118 mm (4.6 inches) | 72% | very high |
| July Weather | 20°C (69°F) | 167 mm (6.6 inches) | 66% | very high |
| August Weather | 19°C (67°F) | 113 mm (4.5 inches) | 64% | very high |
| September Weather | 15°C (60°F) | 86 mm (3.4 inches) | 72% | high |
| October Weather | 9°C (49°F) | 155 mm (6.1 inches) | 81% | moderate |
| November Weather | 1°C (34°F) | 108 mm (4.3 inches) | 87% | moderate |
| December Weather | -4°C (25°F) | 99 mm (3.9 inches) | 84% | low |