Last updated: June 24, 2025
In December, the average temperature in Marion, United States hovers around -1°C (30°F), with remarkable fluctuations that can see minimums plummet to -22°C (-8°F) and maximums rise to a surprising 22°C (72°F). Expect 45 mm (1.8 in) of precipitation spread over approximately 5 days, accompanied by a high average humidity of 84%. Be prepared for the diverse weather this month brings!
In December in Marion, the average temperature is -1°C (30°F), with maximums reaching 22°C (72°F) and minimums dropping as low as -22°C (-8°F). Travelers should be prepared for a wide range of temperatures, from chilly to pleasantly warm, so it's best to pack layers.
In Marion in December, the total precipitation amount is 45 mm (1.8 in) over a span of 5 days.
In Marion in December, humidity is 84%. With an average temperature of -1°C (30°F), this humidity feels like a sharp chill that seeps into your bones, making travel uncomfortable as the wetness in the air intensifies the cold, leaving you yearning for warmth and shelter.
In Marion 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 Marion, you can check the information here.
UV Risk Categories
Weather in Marion varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Marion, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 47 mm (1.9 inches) | 81% | moderate |
| February Weather | -5°C (23°F) | 58 mm (2.3 inches) | 81% | moderate |
| March Weather | 3°C (38°F) | 73 mm (2.9 inches) | 81% | high |
| April Weather | 9°C (48°F) | 81 mm (3.2 inches) | 82% | very high |
| May Weather | 16°C (62°F) | 150 mm (5.9 inches) | 78% | very high |
| June Weather | 23°C (73°F) | 125 mm (4.9 inches) | 81% | extreme |
| July Weather | 24°C (76°F) | 81 mm (3.2 inches) | 79% | very high |
| August Weather | 22°C (73°F) | 83 mm (3.3 inches) | 77% | very high |
| September Weather | 19°C (67°F) | 130 mm (5.1 inches) | 78% | very high |
| October Weather | 11°C (53°F) | 136 mm (5.4 inches) | 78% | high |
| November Weather | 3°C (38°F) | 48 mm (1.9 inches) | 87% | moderate |
| December Weather | -1°C (30°F) | 45 mm (1.8 inches) | 84% | moderate |