December Weather in Williston, United States

Last updated: June 24, 2025

In Williston, United States, the average temperature in December hovers around 11°C (51°F). During this time, temperatures can vary significantly, with a minimum of -6°C (21°F) and a maximum reaching 28°C (82°F). Expect some rain as well, with 122 mm (4.8 in) of precipitation spread over about 10 days. The air stays quite humid, with an average humidity of 87%.

December Temperature in Williston

In December in Williston, the average temperature is 11°C (51°F). Maximum temperatures can reach 28°C (82°F), while minimums can drop as low as -6°C (21°F). This range makes it a great time to experience a variety of outdoor activities, so be sure to pack accordingly!

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 11°C (51°F), with highs reaching up to 28°C (82°F) and lows dropping to around -6°C (21°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 total precipitation amount reaches 122 mm (4.8 in) over the course of 10 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 122 mm (4.8 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 Williston

In Williston in December humidity is 87%. With an average temperature of 11°C (51°F), this humidity feels like a damp chill wrapping around you, making outdoor excursions a bit uncomfortable as the air feels thick and heavy, urging you to seek shelter more often than not.

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 87%, 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 reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Williston for better planning.

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 4, which falls under the moderate 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	9°C (49°F)	88 mm (3.4 inches)	86%	moderate
February Weather	12°C (54°F)	110 mm (4.3 inches)	81%	high
March Weather	15°C (59°F)	81 mm (3.2 inches)	81%	very high
April Weather	18°C (66°F)	117 mm (4.6 inches)	79%	very high
May Weather	23°C (74°F)	102 mm (4.0 inches)	75%	extreme
June Weather	26°C (79°F)	111 mm (4.4 inches)	75%	extreme
July Weather	28°C (82°F)	143 mm (5.6 inches)	80%	extreme
August Weather	27°C (81°F)	144 mm (5.7 inches)	81%	extreme
September Weather	25°C (78°F)	78 mm (3.1 inches)	83%	very high
October Weather	21°C (69°F)	78 mm (3.1 inches)	78%	very high
November Weather	13°C (55°F)	60 mm (2.4 inches)	85%	high
December Weather	11°C (51°F)	122 mm (4.8 inches)	87%	moderate