December Weather in Colwyn, United States

Last updated: June 24, 2025

In December, the average temperature in Colwyn, United States hovers around 4°C (40°F), offering a cool ambiance. The temperature can dip as low as -12°C (10°F) or reach a mild 19°C (67°F). Expect around 100 mm (4.0 in) of rainfall spread across 10 days, contributing to a high average humidity of 84%. Embrace the crisp air and occasional drizzle!

December Temperature in Colwyn

In December in Colwyn, the average temperature is 4°C (40°F). Maximum temperatures can reach 19°C (67°F), while minimums can dip as low as -12°C (10°F). Be prepared for a wide range of temperatures when traveling to Colwyn during this time.

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

The chart illustrates December temperature patterns in Colwyn, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Colwyn, December typically has an average temperature of 4°C (40°F), with highs reaching up to 19°C (67°F) and lows dropping to around -12°C (10°F).

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

December Precipitation in Colwyn

In Colwyn in December, the precipitation amount is 100 mm (4.0 in) over the course of 10 days.

December Precipitation Trends in Colwyn

The chart displays monthly precipitation patterns in Colwyn, 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 Colwyn, December typically receives around 100 mm (4.0 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 Colwyn

In Colwyn in December, humidity is 84%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and requiring extra layers to stay warm and dry while traveling.

December Average Humidity in Colwyn

This chart illustrates the average monthly humidity levels in Colwyn, 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 Colwyn 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 Colwyn

In Colwyn 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 Colwyn, you can check the information here.

Maximum UV Index Levels in Colwyn for December

The chart shows the monthly maximum UV Index (UVI) for Colwyn 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 Colwyn typically reaches 3, which falls under the moderate exposure category.

Data source: Colwyn 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 Colwyn Compares to Other Months

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

This table compares monthly weather conditions in Colwyn, 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 (36°F)	63 mm (2.5 inches)	84%	moderate
February Weather	4°C (39°F)	108 mm (4.3 inches)	83%	moderate
March Weather	7°C (44°F)	107 mm (4.2 inches)	83%	high
April Weather	12°C (55°F)	105 mm (4.1 inches)	81%	very high
May Weather	18°C (65°F)	133 mm (5.2 inches)	78%	very high
June Weather	23°C (74°F)	102 mm (4.0 inches)	79%	very high
July Weather	26°C (79°F)	131 mm (5.2 inches)	74%	very high
August Weather	25°C (77°F)	134 mm (5.3 inches)	72%	very high
September Weather	22°C (71°F)	93 mm (3.7 inches)	75%	very high
October Weather	16°C (61°F)	106 mm (4.2 inches)	81%	high
November Weather	8°C (47°F)	83 mm (3.3 inches)	85%	moderate
December Weather	4°C (40°F)	100 mm (4.0 inches)	84%	moderate