January Weather in Roscommon, United States

Last updated: June 24, 2025

In Roscommon, United States, the average temperature in January is a chilly -6°C (21°F). Expect minimums to dip as low as -27°C (-17°F), while the warmest days can reach up to 12°C (54°F). This month also sees about 50 mm (2.0 in) of precipitation spread over approximately 9 days, and with an average humidity of 92%, it's crucial to bundle up and stay dry!

January Temperature in Roscommon

In January in Roscommon, the average temperature is -6°C (21°F). Maximums can reach 12°C (54°F), while minimums can drop as low as -27°C (-17°F). Travelers should be prepared for a wide range of temperatures and dress accordingly for both chilly conditions and warmer days.

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

The chart illustrates January temperature patterns in Roscommon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Roscommon, January typically has an average temperature of -6°C (21°F), with highs reaching up to 12°C (54°F) and lows dropping to around -27°C (-17°F).

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

January Precipitation in Roscommon

In Roscommon in January, the precipitation amount is 50 mm (2.0 in) over the course of 9 days.

January Precipitation Trends in Roscommon

The chart displays monthly precipitation patterns in Roscommon, 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 Roscommon, January typically receives around 50 mm (2.0 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 Roscommon

In Roscommon in January humidity is 92%. With an average temperature of -6°C (21°F), this humidity feels like an icy blanket that clings to your skin, making the cold air feel even more biting and heavy, which can be quite challenging for traveling.

January Average Humidity in Roscommon

This chart illustrates the average monthly humidity levels in Roscommon, 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 Roscommon is approximately 92%, 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 Roscommon

In Roscommon in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Roscommon, you can visit Hourly UV Index in Roscommon.

Maximum UV Index Levels in Roscommon for January

The chart shows the monthly maximum UV Index (UVI) for Roscommon 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 Roscommon typically reaches 2, which falls under the low exposure category.

Data source: Roscommon 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 Roscommon Compares to Other Months

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

This table compares monthly weather conditions in Roscommon, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	50 mm (2.0 inches)	92%	low
February Weather	-6°C (21°F)	52 mm (2.1 inches)	91%	moderate
March Weather	-1°C (31°F)	54 mm (2.1 inches)	87%	moderate
April Weather	5°C (42°F)	93 mm (3.7 inches)	85%	very high
May Weather	13°C (56°F)	107 mm (4.2 inches)	79%	very high
June Weather	19°C (66°F)	118 mm (4.6 inches)	75%	very high
July Weather	21°C (71°F)	87 mm (3.4 inches)	75%	very high
August Weather	20°C (68°F)	90 mm (3.6 inches)	75%	very high
September Weather	16°C (61°F)	73 mm (2.9 inches)	79%	high
October Weather	9°C (49°F)	118 mm (4.6 inches)	85%	moderate
November Weather	1°C (35°F)	61 mm (2.4 inches)	88%	moderate
December Weather	-3°C (27°F)	63 mm (2.5 inches)	89%	low