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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 9°C (48°F). While you may experience chilly lows of -7°C (19°F), be prepared for warmer days reaching up to 25°C (78°F). Expect around 125 mm (4.9 in) of precipitation over 10 days, with an average humidity level of 87%. Whether you're embracing the cool air or dodging showers, Unionville has its own unique charm during this season!

December Temperature in Unionville

In December in Unionville, the average temperature is 9°C (48°F). The maximum can reach 25°C (78°F), while the minimum can drop as low as -7°C (19°F). Pack layers and be prepared for a range of weather conditions during your travels!

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 9°C (48°F), with highs reaching up to 25°C (78°F) and lows dropping to around -7°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec455054637177807975665248
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 125 mm (4.9 in) spread over a period of 10 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 125 mm (4.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec95122871051181031191241498087125
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 87%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration uncomfortable and requiring extra layers and careful planning for any activities.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%82%83%82%80%74%75%79%87%87%
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 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 Unionville, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810101111109853
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 Weather7°C (45°F)95 mm (3.7 inches)86%moderate
February Weather10°C (50°F)121 mm (4.8 inches)85%high
March Weather12°C (55°F)87 mm (3.4 inches)84%very high
April Weather17°C (63°F)105 mm (4.1 inches)82%very high
May Weather22°C (72°F)118 mm (4.6 inches)83%very high
June Weather25°C (77°F)103 mm (4.0 inches)82%extreme
July Weather27°C (80°F)119 mm (4.7 inches)80%extreme
August Weather26°C (79°F)123 mm (4.9 inches)74%very high
September Weather24°C (75°F)149 mm (5.9 inches)75%very high
October Weather19°C (66°F)80 mm (3.1 inches)79%very high
November Weather11°C (52°F)87 mm (3.4 inches)87%moderate
December Weather9°C (48°F)125 mm (4.9 inches)87%moderate

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