December Weather in Stonington, United States

Last updated: June 24, 2025

In Stonington, United States, the average temperature in December hovers around 1°C (34°F). Expect chilly conditions, with minimums dropping as low as -17°C (2°F) and maximums reaching up to 13°C (56°F). Be prepared for some precipitation, with an average of 155 mm (6.1 in) over 12 days. Coupled with an average humidity of 84%, this month calls for cozy layers and a good umbrella!

December Temperature in Stonington

In December in Stonington, the average temperature is 1°C (34°F). Maximums can reach 13°C (56°F), while minimums can dip as low as -17°C (2°F). Be prepared for a wide range of temperatures if you plan to travel during this time.

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

The chart illustrates December temperature patterns in Stonington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stonington, December typically has an average temperature of 1°C (34°F), with highs reaching up to 13°C (56°F) and lows dropping to around -17°C (2°F).

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

December Precipitation in Stonington

In Stonington in December, the total precipitation amount reaches 155 mm (6.1 in) over the course of 12 days.

December Precipitation Trends in Stonington

The chart displays monthly precipitation patterns in Stonington, 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 Stonington, December typically receives around 155 mm (6.1 inches) of precipitation spread over approximately 12 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 Stonington

In Stonington in December humidity is 84%. With an average temperature of 1°C (34°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and requiring extra layers to keep warm while navigating the damp air.

December Average Humidity in Stonington

This chart illustrates the average monthly humidity levels in Stonington, 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 Stonington is approximately 84%, 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 Stonington

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

Maximum UV Index Levels in Stonington for December

The chart shows the monthly maximum UV Index (UVI) for Stonington 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 Stonington typically reaches 2, which falls under the low exposure category.

Data source: Stonington 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 Stonington Compares to Other Months

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

This table compares monthly weather conditions in Stonington, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	108 mm (4.3 inches)	88%	low
February Weather	-1°C (30°F)	105 mm (4.1 inches)	88%	moderate
March Weather	0°C (33°F)	84 mm (3.3 inches)	85%	moderate
April Weather	5°C (41°F)	157 mm (6.2 inches)	81%	high
May Weather	9°C (49°F)	105 mm (4.1 inches)	76%	very high
June Weather	13°C (56°F)	87 mm (3.4 inches)	74%	very high
July Weather	16°C (62°F)	92 mm (3.6 inches)	74%	very high
August Weather	18°C (64°F)	86 mm (3.4 inches)	74%	very high
September Weather	16°C (60°F)	102 mm (4.0 inches)	77%	high
October Weather	12°C (54°F)	145 mm (5.7 inches)	82%	moderate
November Weather	6°C (43°F)	138 mm (5.4 inches)	85%	moderate
December Weather	1°C (34°F)	155 mm (6.1 inches)	84%	low