January Weather in Dumbarton, United States

Last updated: June 24, 2025

In January, the average temperature in Dumbarton, United States hovers around 5°C (41°F). Expect a chilly atmosphere where temperatures can plunge to a brisk -17°C (1°F) and occasionally rise to a mild 22°C (73°F). With an average humidity of 84%, it's also a moist period, featuring 68 mm (2.7 in) of precipitation spread over 9 days. Prepare accordingly!

January Temperature in Dumbarton

In January in Dumbarton, the average temperature is 5°C (41°F), with maximums reaching up to 22°C (73°F) and minimums dipping as low as -17°C (1°F). Be prepared for a wide range of temperatures during your travels, ensuring you pack accordingly for both warm and chilly days.

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

The chart illustrates January temperature patterns in Dumbarton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Dumbarton, January typically has an average temperature of 5°C (41°F), with highs reaching up to 22°C (73°F) and lows dropping to around -17°C (1°F).

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

January Precipitation in Dumbarton

In Dumbarton in January, the precipitation amount is 68 mm (2.7 in) spread over 9 days.

January Precipitation Trends in Dumbarton

The chart displays monthly precipitation patterns in Dumbarton, 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 Dumbarton, January typically receives around 68 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 Dumbarton

In Dumbarton in January humidity is 84%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable as you navigate through the cold, heavy air that clings to your skin.

January Average Humidity in Dumbarton

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

In Dumbarton 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 Dumbarton, you can check the information here.

Maximum UV Index Levels in Dumbarton for January

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

Data source: Dumbarton 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 Dumbarton Compares to Other Months

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

This table compares monthly weather conditions in Dumbarton, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	68 mm (2.7 inches)	84%	moderate
February Weather	7°C (45°F)	99 mm (3.9 inches)	84%	high
March Weather	10°C (50°F)	72 mm (2.8 inches)	84%	high
April Weather	15°C (60°F)	105 mm (4.1 inches)	82%	very high
May Weather	20°C (69°F)	102 mm (4.0 inches)	82%	very high
June Weather	24°C (76°F)	123 mm (4.9 inches)	83%	very high
July Weather	27°C (81°F)	104 mm (4.1 inches)	79%	very high
August Weather	26°C (78°F)	170 mm (6.7 inches)	77%	very high
September Weather	23°C (74°F)	97 mm (3.8 inches)	75%	very high
October Weather	18°C (64°F)	127 mm (5.0 inches)	81%	high
November Weather	10°C (50°F)	74 mm (2.9 inches)	87%	moderate
December Weather	7°C (44°F)	95 mm (3.7 inches)	85%	moderate