January Weather in Riley, United States

Last updated: June 24, 2025

In Riley, United States, the average temperature in January hovers around -1°C (31°F), with potential extremes reaching a brisk -22°C (-8°F) at night and a mild 18°C (66°F) during the day. You can expect about 30 mm (1.2 in) of precipitation spread over 4 days, accompanied by an average humidity level of 76%. Stay prepared for a chilly yet intriguing month!

January Temperature in Riley

In January in Riley, the average temperature is -1°C (31°F). The maximum can reach 18°C (66°F) and the minimum can be as low as -22°C (-8°F). Travelers should prepare for a wide range of temperatures and dress in layers to stay comfortable during their visit.

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

The chart illustrates January temperature patterns in Riley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Riley, January typically has an average temperature of -1°C (31°F), with highs reaching up to 18°C (66°F) and lows dropping to around -22°C (-8°F).

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

January Precipitation in Riley

In Riley in January, the precipitation amount is 30 mm (1.2 in) over the course of 4 days.

January Precipitation Trends in Riley

The chart displays monthly precipitation patterns in Riley, 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 Riley, January typically receives around 30 mm (1.2 inches) of precipitation spread over approximately 4 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 Riley

In Riley in January, humidity is 76%. With an average temperature of -1°C (31°F), this humidity feels like a frigid chill clinging to your skin, making travel quite uncomfortable as the cold air intensifies the dampness, leaving you feeling even colder than the actual temperature.

January Average Humidity in Riley

This chart illustrates the average monthly humidity levels in Riley, 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 Riley is approximately 76%, 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 Riley

In Riley 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 Riley, you can check the information here.

Maximum UV Index Levels in Riley for January

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

Data source: Riley 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 Riley Compares to Other Months

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

This table compares monthly weather conditions in Riley, 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 (31°F)	30 mm (1.2 inches)	76%	moderate
February Weather	0°C (32°F)	28 mm (1.1 inches)	77%	moderate
March Weather	8°C (46°F)	84 mm (3.3 inches)	70%	high
April Weather	12°C (55°F)	67 mm (2.6 inches)	73%	very high
May Weather	19°C (66°F)	185 mm (7.3 inches)	82%	very high
June Weather	26°C (79°F)	79 mm (3.1 inches)	82%	extreme
July Weather	27°C (81°F)	80 mm (3.1 inches)	81%	extreme
August Weather	25°C (78°F)	119 mm (4.7 inches)	78%	very high
September Weather	23°C (73°F)	64 mm (2.5 inches)	71%	very high
October Weather	14°C (57°F)	98 mm (3.9 inches)	71%	high
November Weather	7°C (44°F)	33 mm (1.3 inches)	81%	moderate
December Weather	3°C (37°F)	27 mm (1.0 inches)	84%	moderate