December Weather in Sweeny, United States

Last updated: June 24, 2025

In December, the average temperature in Sweeny, United States hovers around 15°C (60°F). While the mercury can dip as low as -1°C (31°F), it may rise to a pleasant 28°C (83°F). Expect some rainfall as well, with 88 mm (3.5 in) of precipitation spread over 9 days. The atmosphere is notably humid, with an average humidity level of 84%.

December Temperature in Sweeny

In December in Sweeny, the average temperature is 15°C (60°F), with maximums reaching 28°C (83°F) and minimums dropping as low as -1°C (31°F). Be prepared for a diverse range of weather conditions to make the most of your traveling experience.

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

The chart illustrates December temperature patterns in Sweeny, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sweeny, December typically has an average temperature of 15°C (60°F), with highs reaching up to 28°C (83°F) and lows dropping to around -1°C (31°F).

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

December Precipitation in Sweeny

In Sweeny in December, the precipitation amount is 88 mm (3.5 in) over the course of 9 days.

December Precipitation Trends in Sweeny

The chart displays monthly precipitation patterns in Sweeny, 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 Sweeny, December typically receives around 88 mm (3.5 inches) of precipitation spread over approximately 9 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 Sweeny

In Sweeny in December humidity is 84%. With an average temperature of 15°C (60°F), this humidity feels like a warm blanket wrapped around you, making outdoor exploration feel stifling and sticky, while creating a heavy air that may slow your pace and dampen your enthusiasm for sightseeing.

December Average Humidity in Sweeny

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

In Sweeny in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Sweeny.

Maximum UV Index Levels in Sweeny for December

The chart shows the monthly maximum UV Index (UVI) for Sweeny 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 Sweeny typically reaches 5, which falls under the moderate exposure category.

Data source: Sweeny 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 Sweeny Compares to Other Months

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

This table compares monthly weather conditions in Sweeny, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (57°F)	75 mm (2.9 inches)	78%	moderate
February Weather	15°C (60°F)	68 mm (2.7 inches)	81%	very high
March Weather	19°C (67°F)	70 mm (2.8 inches)	76%	very high
April Weather	22°C (72°F)	71 mm (2.8 inches)	79%	extreme
May Weather	26°C (79°F)	147 mm (5.8 inches)	79%	extreme
June Weather	28°C (83°F)	159 mm (6.3 inches)	74%	extreme
July Weather	29°C (84°F)	151 mm (6.0 inches)	71%	extreme
August Weather	29°C (85°F)	169 mm (6.6 inches)	68%	extreme
September Weather	27°C (81°F)	174 mm (6.9 inches)	73%	extreme
October Weather	23°C (74°F)	81 mm (3.2 inches)	75%	very high
November Weather	18°C (64°F)	78 mm (3.1 inches)	78%	high
December Weather	15°C (60°F)	88 mm (3.5 inches)	84%	moderate