December Weather in Cool, United States

Last updated: June 24, 2025

In December, the average temperature in Cool, United States hovers around 8°C (47°F). Expect temperatures to dip as low as -2°C (29°F) and reach a peak of 22°C (73°F). With an average precipitation of 178 mm (7.0 in) spread over 10 days, and humidity levels at a steamy 83%, it's essential to prepare for a mixed bag of weather conditions!

December Temperature in Cool

In December in Cool, the average temperature is 8°C (47°F), with maximums reaching 22°C (73°F) and minimums dipping as low as -2°C (29°F). This variety in temperatures makes it essential for travelers to pack layers for their visit.

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

The chart illustrates December temperature patterns in Cool, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cool, December typically has an average temperature of 8°C (47°F), with highs reaching up to 22°C (73°F) and lows dropping to around -2°C (29°F).

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

December Precipitation in Cool

In Cool in December, the precipitation amount is 178 mm (7.0 in) spread over a duration of 10 days.

December Precipitation Trends in Cool

The chart displays monthly precipitation patterns in Cool, 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 Cool, December typically receives around 178 mm (7.0 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 Cool

In Cool in December humidity is 83%. With an average temperature of 8°C (47°F), this humidity feels like a chilly dampness that clings to your skin, making travel uncomfortable and leaving you yearning for warmth and dryness as you explore.

December Average Humidity in Cool

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

In Cool in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Cool, you can check the information here.

Maximum UV Index Levels in Cool for December

The chart shows the monthly maximum UV Index (UVI) for Cool 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 Cool typically reaches 3, which falls under the moderate exposure category.

Data source: Cool 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 Cool Compares to Other Months

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

This table compares monthly weather conditions in Cool, 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 (47°F)	227 mm (8.9 inches)	84%	moderate
February Weather	9°C (49°F)	230 mm (9.1 inches)	84%	moderate
March Weather	11°C (52°F)	237 mm (9.3 inches)	83%	high
April Weather	14°C (58°F)	112 mm (4.4 inches)	81%	very high
May Weather	18°C (65°F)	62 mm (2.4 inches)	74%	very high
June Weather	23°C (74°F)	8 mm (0.3 inches)	64%	extreme
July Weather	27°C (80°F)	0 mm (0.0 inches)	44%	extreme
August Weather	26°C (79°F)	0 mm (0.0 inches)	36%	very high
September Weather	23°C (73°F)	17 mm (0.7 inches)	44%	very high
October Weather	17°C (63°F)	67 mm (2.7 inches)	65%	high
November Weather	11°C (53°F)	131 mm (5.1 inches)	84%	moderate
December Weather	8°C (47°F)	178 mm (7.0 inches)	83%	moderate