December Weather in Port Arthur, United States

Last updated: June 24, 2025

In December, the average temperature in Port Arthur, United States is a mild 14°C (58°F). However, be prepared for a range: temperatures can dip to a chilly -1°C (31°F) or rise to a warm 27°C (80°F). Expect about 140 mm (5.5 in) of precipitation over 10 days, and with an average humidity of 83%, it’s best to pack accordingly for a pleasantly damp experience!

December Temperature in Port Arthur

In December in Port Arthur, the average temperature is 14°C (58°F). Maximum temperatures can reach 27°C (80°F), while minimums can dip as low as -1°C (31°F). Travelers should be prepared for a wide range of temperatures during this time.

December Weather in Port Arthur: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Port Arthur, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Port Arthur, December typically has an average temperature of 14°C (58°F), with highs reaching up to 27°C (80°F) and lows dropping to around -1°C (31°F).

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

December Precipitation in Port Arthur

In Port Arthur in December, the total precipitation amount is 140 mm (5.5 in) spread over a period of 10 days.

December Precipitation Trends in Port Arthur

The chart displays monthly precipitation patterns in Port Arthur, 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 Port Arthur, December typically receives around 140 mm (5.5 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 Port Arthur

In Port Arthur in December, humidity is 83%. With an average temperature of 14°C (58°F), this humidity feels like a thick blanket enveloping you, making exploration feel heavier and sweatier, so be prepared for a slower pace while traveling.

December Average Humidity in Port Arthur

This chart illustrates the average monthly humidity levels in Port Arthur, 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 Port Arthur 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 Port Arthur

In Port Arthur 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 Port Arthur.

Maximum UV Index Levels in Port Arthur for December

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

Data source: Port Arthur 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 Port Arthur Compares to Other Months

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

This table compares monthly weather conditions in Port Arthur, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	98 mm (3.8 inches)	79%	moderate
February Weather	14°C (58°F)	90 mm (3.5 inches)	80%	very high
March Weather	18°C (65°F)	76 mm (3.0 inches)	78%	very high
April Weather	21°C (69°F)	125 mm (4.9 inches)	81%	extreme
May Weather	25°C (77°F)	189 mm (7.4 inches)	79%	extreme
June Weather	27°C (82°F)	181 mm (7.1 inches)	75%	extreme
July Weather	28°C (83°F)	153 mm (6.0 inches)	74%	extreme
August Weather	28°C (83°F)	228 mm (9.0 inches)	73%	extreme
September Weather	27°C (80°F)	202 mm (8.0 inches)	75%	very high
October Weather	22°C (73°F)	143 mm (5.6 inches)	75%	very high
November Weather	16°C (62°F)	74 mm (2.9 inches)	79%	high
December Weather	14°C (58°F)	140 mm (5.5 inches)	83%	moderate