December Weather in Wilton, United States

Last updated: June 24, 2025

In December, the average temperature in Wilton, United States hovers around 9°C (48°F). Expect chilly nights with a minimum of -3°C (28°F), while daytime highs can reach up to 23°C (74°F). Throughout the month, anticipate a total precipitation of 116 mm (4.6 in) spread over approximately 10 days, with average humidity levels around 83%.

December Temperature in Wilton

In December in Wilton, the average temperature is 9°C (48°F). Maximums can reach 23°C (74°F), while minimums can be as low as -3°C (28°F). Be prepared for a range of temperatures to make the most of your travels in this season.

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 9°C (48°F), with highs reaching up to 23°C (74°F) and lows dropping to around -3°C (28°F).

Data source: Temperature data for Wilton generated using information from the Copernicus Climate Change Service.

December Precipitation in Wilton

In Wilton in December, the total precipitation amount is 116 mm (4.6 in) 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 116 mm (4.6 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Wilton

In Wilton in December humidity is 83%. With an average temperature of 9°C (48°F), this humidity feels like an enveloping blanket, making outdoor activities quite uncomfortable and encouraging travelers to seek shelter or shade frequently.

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 83%, offering insight into how humid the weather typically is during this month.

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 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 Wilton, you can check the information here.

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 3, which falls under the moderate exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	128 mm (5.0 inches)	84%	moderate
February Weather	11°C (52°F)	118 mm (4.7 inches)	84%	moderate
March Weather	13°C (55°F)	119 mm (4.7 inches)	83%	high
April Weather	16°C (62°F)	54 mm (2.1 inches)	81%	very high
May Weather	20°C (68°F)	25 mm (1.0 inches)	74%	very high
June Weather	24°C (75°F)	5 mm (0.2 inches)	64%	extreme
July Weather	25°C (77°F)	0 mm (0.0 inches)	44%	extreme
August Weather	25°C (77°F)	0 mm (0.0 inches)	36%	very high
September Weather	23°C (73°F)	3 mm (0.1 inches)	44%	very high
October Weather	18°C (65°F)	41 mm (1.6 inches)	65%	high
November Weather	13°C (55°F)	66 mm (2.6 inches)	84%	moderate
December Weather	9°C (48°F)	116 mm (4.6 inches)	83%	moderate