January Weather in Cohasset, United States

Last updated: June 24, 2025

In January, the average temperature in Cohasset, United States hovers around 7°C (44°F), with it dipping as low as -6°C (21°F) and peaking at a pleasant 22°C (72°F). Expect a fair bit of rain, as the area receives approximately 200 mm (7.9 in) of precipitation spread over 11 days. Plus, with an average humidity of 84%, you'll definitely feel the moisture in the air!

January Temperature in Cohasset

In January in Cohasset, the average temperature is 7°C (44°F). Maximums can reach 22°C (72°F), and minimums can drop as low as -6°C (21°F). Be sure to pack layers to enjoy the mild afternoons while being prepared for chilly evenings.

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

The chart illustrates January temperature patterns in Cohasset, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cohasset, January typically has an average temperature of 7°C (44°F), with highs reaching up to 22°C (72°F) and lows dropping to around -6°C (21°F).

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

January Precipitation in Cohasset

In Cohasset in January, the precipitation amount is 200 mm (7.9 in) over the course of 11 days.

January Precipitation Trends in Cohasset

The chart displays monthly precipitation patterns in Cohasset, 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 Cohasset, January typically receives around 200 mm (7.9 inches) of precipitation spread over approximately 11 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 Cohasset

In Cohasset in January humidity is 84%. With an average temperature of 7°C (44°F), this humidity feels like a damp chill that seeps into your bones, making it uncomfortable for traveling and requiring extra layers to stay warm and dry.

January Average Humidity in Cohasset

This chart illustrates the average monthly humidity levels in Cohasset, 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 Cohasset is approximately 84%, 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 Cohasset

In Cohasset 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 Cohasset, you can check the information here.

Maximum UV Index Levels in Cohasset for January

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

Data source: Cohasset 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 Cohasset Compares to Other Months

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

This table compares monthly weather conditions in Cohasset, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (44°F)	200 mm (7.9 inches)	84%	moderate
February Weather	7°C (46°F)	206 mm (8.1 inches)	84%	moderate
March Weather	9°C (48°F)	177 mm (7.0 inches)	83%	high
April Weather	13°C (56°F)	90 mm (3.6 inches)	81%	very high
May Weather	17°C (63°F)	62 mm (2.4 inches)	74%	extreme
June Weather	23°C (73°F)	15 mm (0.6 inches)	64%	extreme
July Weather	27°C (81°F)	2 mm (0.1 inches)	44%	extreme
August Weather	26°C (78°F)	4 mm (0.2 inches)	36%	very high
September Weather	21°C (71°F)	15 mm (0.6 inches)	44%	very high
October Weather	15°C (60°F)	58 mm (2.3 inches)	65%	high
November Weather	10°C (50°F)	107 mm (4.2 inches)	84%	moderate
December Weather	6°C (43°F)	154 mm (6.1 inches)	83%	moderate