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December Weather in Wilton, United States

Last updated: June 24, 2025

In December, the average temperature in Wilton, United States is a brisk -7°C (20°F), with lows plummeting to -34°C (-30°F) and highs reaching up to 13°C (56°F). Expect 23 mm (0.9 in) of precipitation spread over 6 days, accompanied by a high average humidity of 84%. Embrace the chill and make the most of this wintry month!

December Temperature in Wilton

In December in Wilton, the average temperature is -7°C (20°F), with a maximum that can reach 13°C (56°F) and a minimum that can plummet to -34°C (-30°F). Travelers should be well-prepared for a range of temperatures to ensure a comfortable experience.

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

The chart illustrates December temperature patterns in Wilton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wilton, December typically has an average temperature of -7°C (20°F), with highs reaching up to 13°C (56°F) and lows dropping to around -34°C (-30°F).
JanFebMarAprMayJunJulAugSepOctNovDec131128385568726859432920
Data source: Temperature data for Wilton 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 Wilton

In Wilton in December, the precipitation amount is 23 mm (0.9 in) spread over 6 days.

December Precipitation Trends in Wilton

The chart displays monthly precipitation patterns in Wilton, 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 Wilton, December typically receives around 23 mm (0.9 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec131726284559656765501923
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Wilton

In Wilton in December, humidity is 84%. With an average temperature of -7°C (20°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and requiring extra layers to stay warm and dry.

December Average Humidity in Wilton

This chart illustrates the average monthly humidity levels in Wilton, 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 Wilton is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%88%78%75%76%79%78%78%69%71%82%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Wilton

In Wilton 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 Wilton, you can visit Hourly UV Index in Wilton.

Maximum UV Index Levels in Wilton for December

The chart shows the monthly maximum UV Index (UVI) for Wilton 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 Wilton typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2459810987532
Data source: Wilton 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 Wilton Compares to Other Months

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

This table compares monthly weather conditions in Wilton, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-11°C (13°F)13 mm (0.5 inches)84%low
February Weather-12°C (11°F)17 mm (0.7 inches)88%moderate
March Weather-2°C (28°F)26 mm (1.0 inches)78%moderate
April Weather4°C (39°F)28 mm (1.1 inches)75%very high
May Weather13°C (55°F)45 mm (1.8 inches)76%very high
June Weather20°C (68°F)59 mm (2.3 inches)79%very high
July Weather22°C (72°F)65 mm (2.5 inches)78%very high
August Weather20°C (69°F)67 mm (2.6 inches)78%very high
September Weather15°C (60°F)65 mm (2.6 inches)69%high
October Weather6°C (43°F)50 mm (2.0 inches)71%moderate
November Weather-1°C (30°F)19 mm (0.8 inches)82%moderate
December Weather-7°C (20°F)23 mm (0.9 inches)84%low

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