Last updated: June 24, 2025
In Bay City, United States, the average temperature in December hovers around 15°C (60°F). Expect minimums of -1°C (30°F) and maximums reaching 28°C (83°F). During this period, the region experiences about 90 mm (3.5 in) of precipitation over 8 days, with an average humidity level of 84%. Stay prepared for varying conditions!
In December in Bay City, the average temperature is 15°C (60°F). The maximum can reach 28°C (83°F) and the minimum can be as low as -1°C (30°F). This range makes Bay City an ideal destination for travelers looking to experience a mix of mild and warmer weather during their visit.
In Bay City in December, the precipitation amount is 90 mm (3.5 in) spread over 8 days, indicating a relatively wet period for the region.
In Bay City in December humidity is 84%. With an average temperature of 15°C (60°F), this humidity feels like a warm blanket wrapped around you, making outdoor exploration feel stifling and sticky, while creating a heavy air that may slow your pace and dampen your enthusiasm for sightseeing.
In Bay City 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 Bay City.
UV Risk Categories
Weather in Bay City varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Bay City, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 13°C (56°F) | 73 mm (2.9 inches) | 78% | moderate |
| February Weather | 15°C (60°F) | 72 mm (2.8 inches) | 81% | very high |
| March Weather | 19°C (67°F) | 70 mm (2.7 inches) | 76% | very high |
| April Weather | 22°C (72°F) | 71 mm (2.8 inches) | 79% | extreme |
| May Weather | 26°C (79°F) | 137 mm (5.4 inches) | 79% | extreme |
| June Weather | 28°C (83°F) | 157 mm (6.2 inches) | 74% | extreme |
| July Weather | 29°C (84°F) | 145 mm (5.7 inches) | 71% | extreme |
| August Weather | 29°C (85°F) | 171 mm (6.7 inches) | 68% | extreme |
| September Weather | 27°C (81°F) | 165 mm (6.5 inches) | 73% | extreme |
| October Weather | 23°C (74°F) | 74 mm (2.9 inches) | 75% | very high |
| November Weather | 18°C (64°F) | 78 mm (3.1 inches) | 78% | high |
| December Weather | 15°C (60°F) | 90 mm (3.5 inches) | 84% | moderate |