Last updated: June 24, 2025
In Mount Pleasant, United States, the average temperature in December hovers around 1°C (33°F). Expect extremes, as temperatures can dip to a chilling -22°C (-7°F) or soar to a warm 23°C (73°F). During this month, anticipate 46 mm (1.8 in) of precipitation spread over approximately 5 days, with the air holding an average humidity of 84%.
In December in Mount Pleasant, the average temperature is 1°C (33°F). Maximums can reach 23°C (73°F), and minimums can be as low as -22°C (-7°F). This wide temperature range makes Mount Pleasant a destination where travelers should be prepared for both chilly and mild weather.
In Mount Pleasant in December, the precipitation amount is 46 mm (1.8 in) recorded over a span of 5 days.
In Mount Pleasant in December humidity is 84%. With an average temperature of 1°C (33°F), this humidity feels like an icy blanket, making travel uncomfortable and breathless as the frigid air clings to your skin and dampens your clothes.
In Mount Pleasant in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Mount Pleasant, you can check the information here.
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 (25°F) | 54 mm (2.1 inches) | 81% | moderate |
| February Weather | -3°C (27°F) | 59 mm (2.3 inches) | 81% | moderate |
| March Weather | 5°C (42°F) | 92 mm (3.6 inches) | 81% | high |
| April Weather | 10°C (51°F) | 87 mm (3.4 inches) | 82% | very high |
| May Weather | 18°C (64°F) | 164 mm (6.5 inches) | 78% | very high |
| June Weather | 24°C (75°F) | 145 mm (5.7 inches) | 81% | extreme |
| July Weather | 25°C (78°F) | 72 mm (2.8 inches) | 79% | very high |
| August Weather | 24°C (75°F) | 72 mm (2.8 inches) | 77% | very high |
| September Weather | 21°C (70°F) | 110 mm (4.3 inches) | 78% | very high |
| October Weather | 13°C (55°F) | 132 mm (5.2 inches) | 78% | high |
| November Weather | 4°C (40°F) | 51 mm (2.0 inches) | 87% | moderate |
| December Weather | 1°C (33°F) | 46 mm (1.8 inches) | 84% | moderate |