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December Weather in Union City, United States

Last updated: June 24, 2025

In December, the average temperature in Union City, United States hovers around 6°C (44°F), with a possible minimum dipping to -9°C (15°F) and a maximum reaching 27°C (81°F). Expect a total precipitation of about 33 mm (1.3 in) spread over 3 days, contributing to an average humidity level of 84%.

December Temperature in Union City

In December in Union City, the average temperature is 6°C (44°F). The maximum can reach 27°C (81°F) and the minimum can be as low as -9°C (15°F). Be prepared for a range of weather conditions and pack accordingly for your trip!

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 6°C (44°F), with highs reaching up to 27°C (81°F) and lows dropping to around -9°C (15°F).
JanFebMarAprMayJunJulAugSepOctNovDec394053596979838175614943
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 33 mm (1.3 in) over the course of 3 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 33 mm (1.3 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec41387810114088535880942733
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 84%. With an average temperature of 6°C (44°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities less comfortable and necessitating layered clothing to stay warm and dry while exploring the area.

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 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%76%70%72%82%82%80%72%64%71%81%84%
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 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Union City, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111121110753
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 Weather4°C (39°F)41 mm (1.6 inches)76%moderate
February Weather4°C (40°F)38 mm (1.5 inches)76%high
March Weather12°C (53°F)78 mm (3.1 inches)70%very high
April Weather15°C (59°F)101 mm (4.0 inches)72%very high
May Weather21°C (70°F)140 mm (5.5 inches)82%extreme
June Weather26°C (79°F)88 mm (3.5 inches)82%extreme
July Weather28°C (83°F)53 mm (2.1 inches)80%extreme
August Weather27°C (81°F)58 mm (2.3 inches)72%extreme
September Weather24°C (76°F)80 mm (3.2 inches)64%very high
October Weather16°C (62°F)94 mm (3.7 inches)71%high
November Weather10°C (50°F)27 mm (1.1 inches)81%moderate
December Weather6°C (44°F)33 mm (1.3 inches)84%moderate

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