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December Weather in Unionville, United States

Last updated: June 24, 2025

In December, the average temperature in Unionville, United States hovers around 12°C (55°F), offering a mild climate. However, temperatures can swing dramatically, with a minimum as low as -4°C (25°F) and a peak reaching 27°C (81°F). Expect about 123 mm (4.8 in) of precipitation spread over 9 days, contributing to a notably high average humidity of 88%.

December Temperature in Unionville

In December in Unionville, the average temperature is 12°C (55°F). Maximum temperatures can reach 27°C (81°F), while minimums can drop as low as -4°C (25°F). Be prepared for a wide range of weather conditions if you plan to travel here during this time.

December Weather in Unionville: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Unionville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Unionville, December typically has an average temperature of 12°C (55°F), with highs reaching up to 27°C (81°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec525862687681828280725954
Data source: Temperature data for Unionville 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 Unionville

In Unionville in December, the precipitation amount is 123 mm (4.8 in) over the course of 9 days.

December Precipitation Trends in Unionville

The chart displays monthly precipitation patterns in Unionville, 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 Unionville, December typically receives around 123 mm (4.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec801097993711071231121197651123
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Unionville

In Unionville in December humidity is 88%. With an average temperature of 12°C (55°F), this humidity feels like a damp chill that clings to your skin, making outdoor exploration more challenging and requiring extra layers for comfort.

December Average Humidity in Unionville

This chart illustrates the average monthly humidity levels in Unionville, 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 Unionville is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%80%76%73%74%80%79%83%77%84%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Unionville

In Unionville in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Unionville for better planning.

Maximum UV Index Levels in Unionville for December

The chart shows the monthly maximum UV Index (UVI) for Unionville 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 Unionville typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589101111111110864
Data source: Unionville 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 Unionville Compares to Other Months

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

This table compares monthly weather conditions in Unionville, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)80 mm (3.1 inches)85%moderate
February Weather14°C (58°F)108 mm (4.3 inches)82%very high
March Weather17°C (62°F)79 mm (3.1 inches)80%very high
April Weather20°C (68°F)93 mm (3.7 inches)76%very high
May Weather24°C (76°F)71 mm (2.8 inches)73%extreme
June Weather27°C (81°F)107 mm (4.2 inches)74%extreme
July Weather28°C (83°F)123 mm (4.8 inches)80%extreme
August Weather28°C (82°F)112 mm (4.4 inches)79%extreme
September Weather26°C (80°F)119 mm (4.7 inches)83%very high
October Weather22°C (72°F)76 mm (3.0 inches)77%very high
November Weather15°C (59°F)51 mm (2.0 inches)84%high
December Weather12°C (55°F)123 mm (4.8 inches)88%moderate

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