January Weather in Joliet, United States

Last updated: June 24, 2025

In Joliet, United States, the average temperature in January hovers around -3°C (27°F). This month experiences temperature extremes, with minimums plummeting to -31°C (-23°F) and occasional highs reaching up to 16°C (61°F). Expect 65 mm (2.6 in) of precipitation over approximately 8 days, accompanied by a notable average humidity of 82%.

January Temperature in Joliet

In January in Joliet, the average temperature is -3°C (27°F). Maximums can reach 16°C (61°F), while minimums can plummet to -31°C (-23°F). This wide range in temperatures means that travelers should be prepared for both chilly conditions and the occasional milder day.

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

The chart illustrates January temperature patterns in Joliet, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Joliet, January typically has an average temperature of -3°C (27°F), with highs reaching up to 16°C (61°F) and lows dropping to around -31°C (-23°F).

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

January Precipitation in Joliet

In Joliet in January, the total precipitation amount is 65 mm (2.6 in) spread over the course of 8 days.

January Precipitation Trends in Joliet

The chart displays monthly precipitation patterns in Joliet, 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 Joliet, January typically receives around 65 mm (2.6 inches) of precipitation spread over approximately 8 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 Joliet

In Joliet in January, humidity is 82%. With an average temperature of -3°C (27°F), this humidity feels like a biting chill that seeps into your bones, making traveling uncomfortable and necessitating extra layers to stay warm while navigating through the damp air.

January Average Humidity in Joliet

This chart illustrates the average monthly humidity levels in Joliet, 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 Joliet is approximately 82%, 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 Joliet

In Joliet 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 Joliet, you can check the information here.

Maximum UV Index Levels in Joliet for January

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

Data source: Joliet 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 Joliet Compares to Other Months

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

This table compares monthly weather conditions in Joliet, 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 (27°F)	65 mm (2.6 inches)	82%	moderate
February Weather	-2°C (29°F)	67 mm (2.6 inches)	83%	moderate
March Weather	4°C (40°F)	93 mm (3.7 inches)	84%	high
April Weather	9°C (49°F)	122 mm (4.8 inches)	85%	very high
May Weather	16°C (62°F)	159 mm (6.3 inches)	79%	very high
June Weather	22°C (72°F)	143 mm (5.6 inches)	82%	very high
July Weather	24°C (76°F)	114 mm (4.5 inches)	80%	very high
August Weather	23°C (74°F)	86 mm (3.4 inches)	81%	very high
September Weather	20°C (68°F)	81 mm (3.2 inches)	80%	very high
October Weather	13°C (55°F)	138 mm (5.4 inches)	82%	high
November Weather	4°C (40°F)	61 mm (2.4 inches)	88%	moderate
December Weather	1°C (34°F)	56 mm (2.2 inches)	84%	low