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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 10°C (51°F). Expect a minimum dip to 1°C (35°F) and a maximum rise to 23°C (73°F). With an average precipitation amount of 81 mm (3.2 in) spread across 9 days, you can anticipate a somewhat wet month. Humidity remains high at 80%, contributing to the overall atmospheric feel of the season.

December Temperature in Union City

In December in Union City, the average temperature is 10°C (51°F), with maximums reaching 23°C (73°F) and minimums dropping as low as 1°C (35°F). This mild weather makes Union City a great destination for travelers seeking a comfortable climate.

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 10°C (51°F), with highs reaching up to 23°C (73°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec505254576066687068645650
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 81 mm (3.2 in) spread over a duration of 9 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 81 mm (3.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec98958731241002224081
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 80%. With an average temperature of 10°C (51°F), this humidity feels like a damp layer clinging to the skin, making outdoor activities uncomfortable and requiring travelers to dress in layers to cope with the chill and moisture in the air.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109753
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 Weather10°C (51°F)98 mm (3.9 inches)82%moderate
February Weather11°C (52°F)95 mm (3.8 inches)84%moderate
March Weather12°C (54°F)87 mm (3.4 inches)82%very high
April Weather14°C (57°F)30 mm (1.2 inches)78%very high
May Weather16°C (61°F)23 mm (0.9 inches)71%very high
June Weather19°C (66°F)1 mm (0.0 inches)64%extreme
July Weather20°C (69°F)0 mm (0.0 inches)58%extreme
August Weather21°C (70°F)0 mm (0.0 inches)54%very high
September Weather20°C (69°F)2 mm (0.1 inches)55%very high
October Weather18°C (64°F)22 mm (0.9 inches)62%high
November Weather13°C (56°F)40 mm (1.6 inches)78%moderate
December Weather10°C (51°F)81 mm (3.2 inches)80%moderate

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