December Weather in Basalt, United States

Last updated: June 24, 2025

In December, the average temperature in Basalt, United States hovers around -9°C (17°F). While it can plummet to a chilling -29°C (-20°F), you might also experience a milder peak of 9°C (48°F). Expect 69 mm (2.7 in) of precipitation over approximately 12 days, accompanied by a high average humidity of 89%.

December Temperature in Basalt

In December in Basalt, the average temperature is -9°C (17°F). The maximum can reach 9°C (48°F) and the minimum can be as low as -29°C (-20°F). Be prepared for a cold climate, and bundle up if you're planning to visit during this time!

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

The chart illustrates December temperature patterns in Basalt, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Basalt, December typically has an average temperature of -9°C (17°F), with highs reaching up to 9°C (48°F) and lows dropping to around -29°C (-20°F).

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

December Precipitation in Basalt

In Basalt in December, the precipitation amount is 69 mm (2.7 in) over the span of 12 days.

December Precipitation Trends in Basalt

The chart displays monthly precipitation patterns in Basalt, 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 Basalt, December typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 12 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 Basalt

In Basalt in December, humidity is 89%. With an average temperature of -9°C (17°F), this humidity feels like an unpleasant chill that seeps into your bones, making travel uncomfortable and requiring extra layers to stay warm while battling the damp air.

December Average Humidity in Basalt

This chart illustrates the average monthly humidity levels in Basalt, 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 Basalt is approximately 89%, 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 Basalt

In Basalt 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 Basalt for better planning.

Maximum UV Index Levels in Basalt for December

The chart shows the monthly maximum UV Index (UVI) for Basalt 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 Basalt typically reaches 4, which falls under the moderate exposure category.

Data source: Basalt 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 Basalt Compares to Other Months

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

This table compares monthly weather conditions in Basalt, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-8°C (18°F)	61 mm (2.4 inches)	88%	moderate
February Weather	-7°C (20°F)	81 mm (3.2 inches)	87%	high
March Weather	-2°C (28°F)	85 mm (3.3 inches)	81%	very high
April Weather	0°C (33°F)	66 mm (2.6 inches)	76%	extreme
May Weather	4°C (40°F)	61 mm (2.4 inches)	66%	extreme
June Weather	12°C (53°F)	32 mm (1.3 inches)	58%	extreme
July Weather	16°C (60°F)	46 mm (1.8 inches)	52%	extreme
August Weather	15°C (59°F)	30 mm (1.2 inches)	56%	extreme
September Weather	11°C (52°F)	35 mm (1.4 inches)	65%	very high
October Weather	2°C (36°F)	67 mm (2.6 inches)	76%	high
November Weather	-4°C (24°F)	53 mm (2.1 inches)	82%	moderate
December Weather	-9°C (17°F)	69 mm (2.7 inches)	89%	moderate