Last updated: June 24, 2025
In December, the average temperature in Grand Rapids, United States hovers around -8°C (18°F), with minimums dipping as low as -32°C (-25°F) and maximums reaching up to 6°C (44°F). Expect 52 mm (2.0 in) of precipitation spread over 9 days, and don't forget to brace yourself for an average humidity level of 89%.
In December in Grand Rapids, the average temperature is -8°C (18°F), with maximums reaching 6°C (44°F) and minimums plummeting to -32°C (-25°F). Be prepared for extremely cold conditions and dress warmly if you plan to travel during this time.
In Grand Rapids in December, the precipitation amount is 52 mm (2.0 in) over a span of 9 days.
In Grand Rapids in December humidity is 89%. With an average temperature of -8°C (18°F), this humidity feels like an uncomfortable chill that seeps into your bones, making traveling outdoors a daunting challenge as you contend with the biting cold and damp air.
In Grand Rapids 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 Grand Rapids, you can visit Hourly UV Index in Grand Rapids.
UV Risk Categories
Weather in Grand Rapids varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Grand Rapids, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -12°C (11°F) | 22 mm (0.8 inches) | 92% | low |
| February Weather | -12°C (11°F) | 26 mm (1.0 inches) | 93% | moderate |
| March Weather | -3°C (27°F) | 34 mm (1.3 inches) | 88% | moderate |
| April Weather | 3°C (38°F) | 61 mm (2.4 inches) | 83% | high |
| May Weather | 12°C (53°F) | 60 mm (2.4 inches) | 76% | very high |
| June Weather | 18°C (65°F) | 85 mm (3.4 inches) | 76% | very high |
| July Weather | 21°C (70°F) | 107 mm (4.2 inches) | 76% | very high |
| August Weather | 19°C (67°F) | 86 mm (3.4 inches) | 77% | very high |
| September Weather | 15°C (59°F) | 105 mm (4.1 inches) | 77% | high |
| October Weather | 7°C (44°F) | 103 mm (4.1 inches) | 82% | moderate |
| November Weather | -2°C (28°F) | 33 mm (1.3 inches) | 87% | moderate |
| December Weather | -8°C (18°F) | 52 mm (2.0 inches) | 89% | low |