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December Weather in Union City, United States

Last updated: June 24, 2025

In Union City, United States, the average temperature in December hovers around 2°C (35°F), making it a brisk time of year. Temperatures can dip as low as -21°C (-5°F) or climb to a mild 17°C (64°F). The month typically brings 74 mm (2.9 in) of precipitation over 10 days, contributing to an average humidity level of 86%. Embrace the chill while staying prepared for the dampness!

December Temperature in Union City

In December in Union City, the average temperature is 2°C (35°F). Maximums can reach 17°C (64°F) and minimums can be as low as -21°C (-5°F). This climate offers a unique experience for travelers seeking to enjoy both chilly landscapes and the occasional mild day.

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

The chart illustrates December temperature patterns in Union City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Union City, December typically has an average temperature of 2°C (35°F), with highs reaching up to 17°C (64°F) and lows dropping to around -21°C (-5°F).
JanFebMarAprMayJunJulAugSepOctNovDec293241516372757368574135
Data source: Temperature data for Union 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 Union City

In Union City in December, the precipitation amount is 74 mm (2.9 in) spread over a period of 10 days.

December Precipitation Trends in Union City

The chart displays monthly precipitation patterns in Union 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 Union City, December typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec749610710013812711010781998874
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Union City

In Union City in December humidity is 86%. With an average temperature of 2°C (35°F), this humidity feels like a damp chill that seeps into your bones, making traveling quite uncomfortable as your clothes cling to you and the cold air cuts through any warmth you try to find.

December Average Humidity in Union City

This chart illustrates the average monthly humidity levels in Union 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 Union City is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Union City

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

Maximum UV Index Levels in Union City for December

The chart shows the monthly maximum UV Index (UVI) for Union 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 Union City typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Union 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 Union City Compares to Other Months

Weather in Union City varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Union City, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Union City, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)74 mm (2.9 inches)88%moderate
February Weather0°C (33°F)96 mm (3.8 inches)87%moderate
March Weather5°C (42°F)107 mm (4.2 inches)87%high
April Weather11°C (51°F)99 mm (3.9 inches)87%very high
May Weather17°C (63°F)138 mm (5.4 inches)81%very high
June Weather22°C (72°F)127 mm (5.0 inches)82%very high
July Weather24°C (76°F)110 mm (4.3 inches)81%very high
August Weather23°C (73°F)107 mm (4.2 inches)78%very high
September Weather20°C (69°F)81 mm (3.2 inches)78%very high
October Weather14°C (57°F)99 mm (3.9 inches)82%high
November Weather5°C (41°F)88 mm (3.5 inches)89%moderate
December Weather2°C (35°F)74 mm (2.9 inches)86%low

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