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December Weather in Bay City, United States

Last updated: June 24, 2025

In December, the average temperature in Bay City, United States is a brisk 8°C (46°F). Expect a minimum chill of -2°C (28°F) and a pleasant maximum of 13°C (56°F). The region experiences 301 mm (11.8 in) of precipitation over 22 days, leading to a relatively high average humidity of 87%. Be prepared for a mix of cool temperatures and damp conditions!

December Temperature in Bay City

In December in Bay City, the average temperature is 8°C (46°F), with maximums reaching 13°C (56°F) and minimums dipping as low as -2°C (28°F). Travelers should pack layers to comfortably adjust to the varying temperatures throughout the day.

December Weather in Bay City: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Bay City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bay City, December typically has an average temperature of 8°C (46°F), with highs reaching up to 13°C (56°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec464446485256596059545046
Data source: Temperature data for Bay City generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Bay City

In Bay City in December, the precipitation amount is 301 mm (11.8 in) spread over 22 days.

December Precipitation Trends in Bay City

The chart displays monthly precipitation patterns in Bay City, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Bay City, December typically receives around 301 mm (11.8 inches) of precipitation spread over approximately 22 days.
JanFebMarAprMayJunJulAugSepOctNovDec2702441921577767161896176274301
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Bay City

In Bay City in December, humidity is 87%. With an average temperature of 8°C (46°F), this humidity feels like a chilly, damp fog clinging to your skin, making outdoor activities a bit uncomfortable and causing even mild exertion to leave you feeling clammy and cold.

December Average Humidity in Bay City

This chart illustrates the average monthly humidity levels in Bay City, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Bay City is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%85%83%83%84%82%74%71%81%87%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Bay City

In Bay City 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 Bay City, you can visit Hourly UV Index in Bay City.

Maximum UV Index Levels in Bay City for December

The chart shows the monthly maximum UV Index (UVI) for Bay City in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Bay City typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec23569101087532
Data source: Bay City December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Bay City Compares to Other Months

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.

This table compares monthly weather conditions in Bay City, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)270 mm (10.6 inches)85%low
February Weather7°C (44°F)244 mm (9.6 inches)84%moderate
March Weather8°C (46°F)192 mm (7.6 inches)85%moderate
April Weather9°C (49°F)157 mm (6.2 inches)83%high
May Weather11°C (53°F)77 mm (3.0 inches)83%very high
June Weather14°C (57°F)67 mm (2.6 inches)83%very high
July Weather15°C (59°F)16 mm (0.6 inches)82%very high
August Weather15°C (60°F)17 mm (0.7 inches)74%very high
September Weather15°C (59°F)96 mm (3.8 inches)71%high
October Weather12°C (54°F)176 mm (6.9 inches)81%moderate
November Weather10°C (50°F)274 mm (10.8 inches)87%moderate
December Weather8°C (46°F)301 mm (11.8 inches)87%low

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