December Weather in Merrill, United States

Last updated: June 24, 2025

In December, the average temperature in Merrill, United States hovers around -2°C (28°F), with a notable range; it can dip as low as -24°C (-10°F) or rise to a pleasant 19°C (66°F). Expect about 40 mm (1.6 in) of precipitation spread across approximately 4 days, contributing to the 83% average humidity that defines this chill month.

December Temperature in Merrill

In December in Merrill, the average temperature is -2°C (28°F), with maximums reaching up to 19°C (66°F) and minimums dropping as low as -24°C (-10°F). Be prepared for a wide range of temperatures during your travels, ensuring you pack appropriate clothing for both warmer and colder conditions.

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

The chart illustrates December temperature patterns in Merrill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Merrill, December typically has an average temperature of -2°C (28°F), with highs reaching up to 19°C (66°F) and lows dropping to around -24°C (-10°F).

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

December Precipitation in Merrill

In Merrill in December, the precipitation amount is 40 mm (1.6 in) spread over a duration of 4 days.

December Precipitation Trends in Merrill

The chart displays monthly precipitation patterns in Merrill, 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 Merrill, December typically receives around 40 mm (1.6 inches) of precipitation spread over approximately 4 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 Merrill

In Merrill in December, humidity is 83%. With an average temperature of -2°C (28°F), this humidity feels like a biting chill that penetrates your clothes, making outdoor activities uncomfortable and travel challenging.

December Average Humidity in Merrill

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

In Merrill 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 Merrill, you can check the information here.

Maximum UV Index Levels in Merrill for December

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

Data source: Merrill 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 Merrill Compares to Other Months

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

This table compares monthly weather conditions in Merrill, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (22°F)	27 mm (1.1 inches)	80%	low
February Weather	-6°C (22°F)	30 mm (1.2 inches)	84%	moderate
March Weather	3°C (37°F)	76 mm (3.0 inches)	75%	moderate
April Weather	8°C (47°F)	87 mm (3.4 inches)	79%	very high
May Weather	16°C (60°F)	142 mm (5.6 inches)	74%	very high
June Weather	23°C (74°F)	105 mm (4.1 inches)	81%	extreme
July Weather	24°C (76°F)	70 mm (2.7 inches)	82%	very high
August Weather	22°C (73°F)	105 mm (4.1 inches)	80%	very high
September Weather	19°C (67°F)	105 mm (4.1 inches)	75%	very high
October Weather	10°C (50°F)	78 mm (3.1 inches)	77%	moderate
November Weather	2°C (37°F)	27 mm (1.1 inches)	85%	moderate
December Weather	-2°C (28°F)	40 mm (1.6 inches)	83%	moderate