Last updated: June 24, 2025
In December, the average temperature in Mount Pleasant, United States hovers around -1°C (31°F). However, temperatures can vary significantly, with a minimum plunging to -27°C (-16°F) and a maximum rising to 16°C (61°F). This month also sees 65 mm (2.6 in) of precipitation spread over approximately 9 days, resulting in an average humidity of 86%. Be prepared for chilly and damp conditions!
In December in Mount Pleasant, the average temperature is -1°C (31°F), with maximums reaching up to 16°C (61°F) and minimums plummeting as low as -27°C (-16°F). Travelers should be prepared for a wide range of temperatures, from chilly to relatively mild, making it essential to pack accordingly.
In Mount Pleasant in December, the precipitation amount is 65 mm (2.6 in) over the course of 9 days.
In Mount Pleasant in December humidity is 86%. With an average temperature of -1°C (31°F), this humidity feels like an eerie chill enveloping you, making travel uncomfortable as the damp air bites into your skin and the cold seeps through even the warmest of clothes, creating an atmosphere that is heavy and uninviting.
In Mount Pleasant 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 Pleasant, you can visit Hourly UV Index in Mount Pleasant.
UV Risk Categories
Weather in Mount Pleasant varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mount Pleasant, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (24°F) | 55 mm (2.2 inches) | 88% | low |
| February Weather | -4°C (25°F) | 58 mm (2.3 inches) | 87% | moderate |
| March Weather | 2°C (35°F) | 58 mm (2.3 inches) | 85% | moderate |
| April Weather | 7°C (45°F) | 89 mm (3.5 inches) | 86% | very high |
| May Weather | 15°C (58°F) | 116 mm (4.6 inches) | 80% | very high |
| June Weather | 20°C (69°F) | 112 mm (4.4 inches) | 80% | very high |
| July Weather | 23°C (74°F) | 65 mm (2.5 inches) | 80% | very high |
| August Weather | 22°C (71°F) | 80 mm (3.1 inches) | 80% | very high |
| September Weather | 18°C (64°F) | 104 mm (4.1 inches) | 80% | high |
| October Weather | 11°C (52°F) | 122 mm (4.8 inches) | 84% | moderate |
| November Weather | 3°C (38°F) | 56 mm (2.2 inches) | 89% | moderate |
| December Weather | -1°C (31°F) | 65 mm (2.6 inches) | 86% | low |