December Weather in Williston, South Africa

Last updated: August 31, 2025

In December, the average temperature in Williston, South Africa is a pleasant 23°C (74°F). Visitors can expect a minimum chill of 8°C (46°F) and a sweltering maximum of 38°C (100°F). Throughout the month, precipitation averages just 11 mm (0.5 in) over about 2 days, while the average humidity remains comfortable at 44%.

December Temperature in Williston

In December in Williston, the average temperature is 23°C (74°F). Maximums can reach 38°C (100°F) and minimums can be as low as 8°C (46°F). This makes it an ideal time for travelers seeking warm weather while also being prepared for cooler evenings.

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

The chart illustrates December temperature patterns in Williston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Williston, December typically has an average temperature of 23°C (74°F), with highs reaching up to 38°C (100°F) and lows dropping to around 8°C (46°F).

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

December Precipitation in Williston

In Williston in December, the precipitation amount is 11 mm (0.5 in) over the course of 2 days.

December Precipitation Trends in Williston

The chart displays monthly precipitation patterns in Williston, 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 Williston, December typically receives around 11 mm (0.5 inches) of precipitation spread over approximately 2 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 Williston

In Williston in December humidity is 44%. With an average temperature of 23°C (74°F), this humidity feels like a comfortable embrace, making it pleasant for traveling and exploring the sights without feeling overly hot or sticky.

December Average Humidity in Williston

This chart illustrates the average monthly humidity levels in Williston, 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 Williston is approximately 44%, 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 Williston

In Williston in December, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in Williston.

Maximum UV Index Levels in Williston for December

The chart shows the monthly maximum UV Index (UVI) for Williston 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 Williston typically reaches 16, which falls under the extreme exposure category.

Data source: Williston 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 Williston Compares to Other Months

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

This table compares monthly weather conditions in Williston, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (79°F)	10 mm (0.4 inches)	50%	extreme
February Weather	25°C (78°F)	11 mm (0.4 inches)	55%	extreme
March Weather	23°C (73°F)	15 mm (0.6 inches)	65%	extreme
April Weather	18°C (65°F)	28 mm (1.1 inches)	72%	very high
May Weather	15°C (59°F)	6 mm (0.2 inches)	78%	high
June Weather	11°C (53°F)	5 mm (0.2 inches)	79%	moderate
July Weather	10°C (51°F)	8 mm (0.3 inches)	73%	moderate
August Weather	11°C (52°F)	2 mm (0.1 inches)	64%	high
September Weather	15°C (60°F)	5 mm (0.2 inches)	58%	extreme
October Weather	19°C (66°F)	13 mm (0.5 inches)	53%	extreme
November Weather	21°C (70°F)	6 mm (0.2 inches)	42%	extreme
December Weather	23°C (74°F)	11 mm (0.5 inches)	44%	extreme