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December Weather in Wilton, United States

Last updated: June 24, 2025

In Wilton, United States, the average temperature in December hovers around -4°C (25°F). However, temperatures can fluctuate dramatically, with minimums plunging to -26°C (-14°F) and highs reaching up to 15°C (58°F). Expect about 117 mm (4.6 in) of precipitation over 10 days, alongside an average humidity level of 85%, making for a chilly yet captivating atmosphere.

December Temperature in Wilton

In December in Wilton, the average temperature is -4°C (25°F), with maximums reaching up to 15°C (58°F) and minimums dropping as low as -26°C (-14°F). This range of temperatures makes it essential to pack warm clothing and be prepared for chilly conditions while enjoying your travels.

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 -4°C (25°F), with highs reaching up to 15°C (58°F) and lows dropping to around -26°C (-14°F).
JanFebMarAprMayJunJulAugSepOctNovDec202229425464696861493524
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 total precipitation amount is 117 mm (4.6 in) recorded over a span of 10 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 117 mm (4.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec83857312685801288969129110117
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 85%. With an average temperature of -4°C (25°F), this humidity feels like a damp chill clinging to your skin, making travel outside uncomfortable and leaving you feeling cold and clammy despite the freezing temperatures.

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 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%85%84%78%72%75%74%77%85%86%85%
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.
JanFebMarAprMayJunJulAugSepOctNovDec2458910987532
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-7°C (20°F)83 mm (3.3 inches)91%low
February Weather-5°C (22°F)85 mm (3.4 inches)89%moderate
March Weather-1°C (30°F)73 mm (2.9 inches)85%moderate
April Weather6°C (42°F)126 mm (5.0 inches)84%very high
May Weather12°C (54°F)85 mm (3.4 inches)78%very high
June Weather18°C (65°F)80 mm (3.1 inches)72%very high
July Weather21°C (70°F)128 mm (5.0 inches)75%very high
August Weather20°C (68°F)88 mm (3.5 inches)74%very high
September Weather16°C (61°F)69 mm (2.7 inches)77%high
October Weather10°C (49°F)129 mm (5.1 inches)85%moderate
November Weather2°C (35°F)110 mm (4.3 inches)86%moderate
December Weather-4°C (25°F)117 mm (4.6 inches)85%low

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