Last updated: June 24, 2025
In Mason, United States, the average temperature in December hovers around 12°C (53°F), making for a mild climate. However, be prepared for a temperature range where the minimum can drop to -4°C (25°F), while the maximum can reach up to 30°C (86°F). During this month, expect approximately 36 mm (1.4 in) of precipitation over 5 days, with an average humidity level of 87%, creating a somewhat moist atmosphere.
In December in Mason, the average temperature is 12°C (53°F). The maximum can reach 30°C (86°F), while the minimum can drop as low as -4°C (25°F). Be prepared for a wide range of temperatures when traveling to Mason this December.
In Mason in December, the precipitation amount is 36 mm (1.4 in) over the course of 5 days.
In Mason in December, humidity is 87%. With an average temperature of 12°C (53°F), this humidity feels like a damp blanket enveloping you, making travel uncomfortable and stifling, as the air thickens and clings to your skin, sapping your energy as you navigate the sights.
In Mason in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Mason.
UV Risk Categories
Weather in Mason varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mason, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 10°C (50°F) | 33 mm (1.3 inches) | 78% | moderate |
| February Weather | 11°C (52°F) | 39 mm (1.6 inches) | 78% | high |
| March Weather | 17°C (62°F) | 62 mm (2.4 inches) | 77% | very high |
| April Weather | 20°C (68°F) | 67 mm (2.6 inches) | 78% | extreme |
| May Weather | 24°C (76°F) | 132 mm (5.2 inches) | 82% | extreme |
| June Weather | 28°C (82°F) | 45 mm (1.8 inches) | 78% | extreme |
| July Weather | 29°C (85°F) | 28 mm (1.1 inches) | 69% | extreme |
| August Weather | 29°C (85°F) | 37 mm (1.5 inches) | 63% | extreme |
| September Weather | 26°C (79°F) | 67 mm (2.6 inches) | 66% | very high |
| October Weather | 20°C (69°F) | 63 mm (2.5 inches) | 73% | very high |
| November Weather | 15°C (58°F) | 26 mm (1.0 inches) | 84% | high |
| December Weather | 12°C (53°F) | 36 mm (1.4 inches) | 87% | moderate |