January Weather in Roundup, United States

Last updated: June 24, 2025

In Roundup, United States, the average temperature in January hovers around -3°C (26°F), but don't let that fool you—temperatures can plummet as low as -29°C (-20°F) or rise to a balmy 12°C (55°F). Expect a touch of moisture, with an average precipitation of 19 mm (0.7 in) spread over 5 days. Humidity stays high at an average of 81%, creating a brisk yet invigorating atmosphere.

January Temperature in Roundup

In January in Roundup, the average temperature is -3°C (26°F). The maximum can reach 12°C (55°F), while the minimum can drop as low as -29°C (-20°F). Travelers should be prepared for a wide range of temperatures and dress accordingly to enjoy their stay.

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

The chart illustrates January temperature patterns in Roundup, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Roundup, January typically has an average temperature of -3°C (26°F), with highs reaching up to 12°C (55°F) and lows dropping to around -29°C (-20°F).

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

January Precipitation in Roundup

In Roundup in January, the total precipitation amount is 19 mm (0.7 in) spread over the course of 5 days.

January Precipitation Trends in Roundup

The chart displays monthly precipitation patterns in Roundup, 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 Roundup, January typically receives around 19 mm (0.7 inches) of precipitation spread over approximately 5 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 Roundup

In Roundup in January, humidity is 81%. With an average temperature of -3°C (26°F), this humidity feels like an icy blanket wrapping around you, making travel uncomfortable and the cold air penetrate your clothes, turning every step into a brisk challenge.

January Average Humidity in Roundup

This chart illustrates the average monthly humidity levels in Roundup, 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 Roundup is approximately 81%, 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 Roundup

In Roundup 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 Roundup, you can visit Hourly UV Index in Roundup.

Maximum UV Index Levels in Roundup for January

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

Data source: Roundup 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 Roundup Compares to Other Months

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

This table compares monthly weather conditions in Roundup, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (26°F)	19 mm (0.7 inches)	81%	low
February Weather	-7°C (20°F)	36 mm (1.4 inches)	85%	moderate
March Weather	2°C (35°F)	27 mm (1.1 inches)	77%	moderate
April Weather	6°C (43°F)	61 mm (2.4 inches)	72%	very high
May Weather	12°C (55°F)	65 mm (2.6 inches)	75%	very high
June Weather	19°C (66°F)	69 mm (2.7 inches)	78%	very high
July Weather	23°C (75°F)	22 mm (0.9 inches)	79%	very high
August Weather	22°C (72°F)	20 mm (0.8 inches)	76%	very high
September Weather	16°C (62°F)	38 mm (1.5 inches)	67%	very high
October Weather	7°C (46°F)	34 mm (1.3 inches)	69%	moderate
November Weather	2°C (37°F)	23 mm (0.9 inches)	78%	moderate
December Weather	-2°C (29°F)	26 mm (1.0 inches)	85%	low