January Weather in Sudbury, United States

Last updated: June 24, 2025

In Sudbury, United States, the average temperature in January hovers around -1°C (30°F). Expect a chilly range, with minimums plummeting to -22°C (-6°F) and maximums barely reaching 20°C (69°F). This month brings about 69 mm (2.7 in) of precipitation spread over 9 days, while the air stays notably damp with an average humidity of 86%.

January Temperature in Sudbury

In January in Sudbury, the average temperature is -1°C (30°F). The maximum can reach 20°C (69°F), while the minimum can drop as low as -22°C (-6°F). Be prepared for a wide range of temperatures during your travels to Sudbury this month.

January Weather in Sudbury: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Sudbury, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sudbury, January typically has an average temperature of -1°C (30°F), with highs reaching up to 20°C (69°F) and lows dropping to around -22°C (-6°F).

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

January Precipitation in Sudbury

In Sudbury in January, the precipitation amount is 69 mm (2.7 in) spread over 9 days.

January Precipitation Trends in Sudbury

The chart displays monthly precipitation patterns in Sudbury, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Sudbury, January typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 9 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Sudbury

In Sudbury in January, humidity is 86%. With an average temperature of -1°C (30°F), this humidity feels like a heavy blanket wrapping around you, making traveling feel much colder and more uncomfortable than the temperature suggests.

January Average Humidity in Sudbury

This chart illustrates the average monthly humidity levels in Sudbury, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Sudbury is approximately 86%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Sudbury

In Sudbury in January, 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 Sudbury, you can check the information here.

Maximum UV Index Levels in Sudbury for January

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

Data source: Sudbury January 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 January Weather in Sudbury Compares to Other Months

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

This table compares monthly weather conditions in Sudbury, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	69 mm (2.7 inches)	86%	moderate
February Weather	0°C (32°F)	85 mm (3.3 inches)	84%	moderate
March Weather	3°C (38°F)	86 mm (3.4 inches)	82%	high
April Weather	9°C (48°F)	124 mm (4.9 inches)	80%	very high
May Weather	15°C (59°F)	86 mm (3.4 inches)	72%	very high
June Weather	20°C (69°F)	85 mm (3.4 inches)	72%	very high
July Weather	23°C (74°F)	133 mm (5.3 inches)	67%	very high
August Weather	23°C (73°F)	85 mm (3.4 inches)	66%	very high
September Weather	19°C (66°F)	79 mm (3.1 inches)	71%	high
October Weather	13°C (55°F)	132 mm (5.2 inches)	78%	high
November Weather	5°C (42°F)	97 mm (3.8 inches)	84%	moderate
December Weather	0°C (33°F)	118 mm (4.6 inches)	81%	low