December Weather in Duluth, United States

Last updated: June 24, 2025

In Duluth, United States, the average temperature for December hovers around 9°C (48°F), with extremes ranging from a chilly -6°C (21°F) to a warm 23°C (74°F). Expect a moderate precipitation of 141 mm (5.5 in) spread across approximately 11 days. With an average humidity of 89%, be prepared for a rather damp experience!

December Temperature in Duluth

In December in Duluth, the average temperature is 9°C (48°F). The maximum can reach 23°C (74°F) and the minimum can be as low as -6°C (21°F). Be sure to pack layers to accommodate both warm and chilly weather during your travels.

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

The chart illustrates December temperature patterns in Duluth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Duluth, December typically has an average temperature of 9°C (48°F), with highs reaching up to 23°C (74°F) and lows dropping to around -6°C (21°F).

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

December Precipitation in Duluth

In Duluth in December, the total precipitation amount is 141 mm (5.5 in), which falls over the course of 11 days.

December Precipitation Trends in Duluth

The chart displays monthly precipitation patterns in Duluth, 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 Duluth, December typically receives around 141 mm (5.5 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Duluth

In Duluth in December humidity is 89%. With an average temperature of 9°C (48°F), this humidity feels like a chill that lingers in the air, wrapping around you like a damp blanket, making outdoor activities challenging and encouraging a cozy retreat indoors.

December Average Humidity in Duluth

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

In Duluth 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 Duluth for better planning.

Maximum UV Index Levels in Duluth for December

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

Data source: Duluth 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 Duluth Compares to Other Months

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

This table compares monthly weather conditions in Duluth, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (45°F)	112 mm (4.4 inches)	86%	moderate
February Weather	10°C (50°F)	160 mm (6.3 inches)	84%	high
March Weather	13°C (56°F)	142 mm (5.6 inches)	83%	very high
April Weather	16°C (62°F)	129 mm (5.1 inches)	81%	very high
May Weather	21°C (71°F)	116 mm (4.6 inches)	81%	extreme
June Weather	24°C (76°F)	134 mm (5.3 inches)	81%	extreme
July Weather	26°C (79°F)	118 mm (4.7 inches)	83%	extreme
August Weather	25°C (78°F)	156 mm (6.1 inches)	81%	very high
September Weather	23°C (74°F)	115 mm (4.5 inches)	82%	very high
October Weather	18°C (65°F)	140 mm (5.5 inches)	78%	very high
November Weather	11°C (52°F)	83 mm (3.3 inches)	86%	high
December Weather	9°C (48°F)	141 mm (5.5 inches)	89%	moderate