Last updated: June 24, 2025
In Green Bay, United States, the average temperature in December hovers around -3°C (27°F). While residents can expect chilly lows of -28°C (-18°F), the thermometer can occasionally climb to a pleasant 17°C (63°F). This month also brings 54 mm (2.1 in) of precipitation spread over 7 days, contributing to an average humidity level of 87%. Stay cozy and prepared for a range of weather!
In December in Green Bay, the average temperature is -3°C (27°F), with maximums reaching up to 17°C (63°F) and minimums plummeting as low as -28°C (-18°F). Travelers should be prepared for a wide range of temperatures while visiting, so layering clothing is essential.
In Green Bay in December, the precipitation amount is 54 mm (2.1 in) over a duration of 7 days.
In Green Bay in December humidity is 87%. With an average temperature of -3°C (27°F), this humidity feels like an icy blanket that wraps around you, making outdoor activities challenging as the cold air mingles with the dampness, leaving travelers feeling chilled to the bone even in short bursts outside.
In Green Bay 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 Green Bay, you can visit Hourly UV Index in Green Bay.
UV Risk Categories
Weather in Green Bay varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Green Bay, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 40 mm (1.6 inches) | 89% | low |
| February Weather | -6°C (21°F) | 48 mm (1.9 inches) | 90% | moderate |
| March Weather | 1°C (33°F) | 59 mm (2.3 inches) | 87% | moderate |
| April Weather | 6°C (43°F) | 99 mm (3.9 inches) | 84% | high |
| May Weather | 14°C (57°F) | 106 mm (4.2 inches) | 77% | very high |
| June Weather | 20°C (68°F) | 106 mm (4.2 inches) | 75% | very high |
| July Weather | 23°C (73°F) | 108 mm (4.2 inches) | 74% | very high |
| August Weather | 21°C (70°F) | 107 mm (4.2 inches) | 73% | very high |
| September Weather | 17°C (63°F) | 65 mm (2.5 inches) | 78% | high |
| October Weather | 10°C (50°F) | 94 mm (3.7 inches) | 84% | moderate |
| November Weather | 2°C (35°F) | 48 mm (1.9 inches) | 89% | moderate |
| December Weather | -3°C (27°F) | 54 mm (2.1 inches) | 87% | low |