January Weather in Bethalto, United States

Last updated: June 24, 2025

In January, the average temperature in Bethalto, United States hovers around 0°C (32°F). While the conditions can be chilly, the minimum may dip to a frigid -23°C (-8°F), and the maximum can reach a mild 19°C (66°F). Expect 75 mm (3.0 in) of precipitation spread over about 8 days, and prepare for a notably high average humidity of 82%, adding to the overall atmosphere of this intriguing season.

January Temperature in Bethalto

In January in Bethalto, the average temperature is 0°C (32°F), with maximums reaching up to 19°C (66°F) and minimums plummeting as low as -23°C (-8°F). Be prepared for a wide range of temperatures when traveling to Bethalto during this time.

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

The chart illustrates January temperature patterns in Bethalto, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bethalto, January typically has an average temperature of 0°C (32°F), with highs reaching up to 19°C (66°F) and lows dropping to around -23°C (-8°F).

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

January Precipitation in Bethalto

In Bethalto in January, the total precipitation amount is 75 mm (3.0 in) over the course of 8 days.

January Precipitation Trends in Bethalto

The chart displays monthly precipitation patterns in Bethalto, 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 Bethalto, January typically receives around 75 mm (3.0 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Bethalto

In Bethalto in January, humidity is 82%. With an average temperature of 0°C (32°F), this humidity feels like an icy breath enveloping you, making each step outdoors a challenge as the cold dampness seeps into your clothes, chilling you to the bone and sapping your energy while traveling.

January Average Humidity in Bethalto

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

In Bethalto 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 Bethalto, you can check the information here.

Maximum UV Index Levels in Bethalto for January

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

Data source: Bethalto 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 Bethalto Compares to Other Months

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

This table compares monthly weather conditions in Bethalto, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (32°F)	75 mm (3.0 inches)	82%	moderate
February Weather	1°C (35°F)	80 mm (3.1 inches)	80%	moderate
March Weather	8°C (46°F)	133 mm (5.2 inches)	80%	high
April Weather	12°C (55°F)	132 mm (5.2 inches)	80%	very high
May Weather	19°C (67°F)	156 mm (6.1 inches)	82%	very high
June Weather	25°C (77°F)	111 mm (4.4 inches)	83%	extreme
July Weather	26°C (79°F)	100 mm (3.9 inches)	81%	extreme
August Weather	24°C (76°F)	120 mm (4.7 inches)	80%	very high
September Weather	22°C (72°F)	64 mm (2.5 inches)	76%	very high
October Weather	15°C (59°F)	102 mm (4.0 inches)	76%	high
November Weather	6°C (44°F)	75 mm (2.9 inches)	85%	moderate
December Weather	3°C (38°F)	57 mm (2.2 inches)	86%	moderate