January Weather in Ballwin, United States

Last updated: June 24, 2025

In January, the average temperature in Ballwin, United States hovers around 0°C (33°F). Expect cool weather, with minimums dipping to -21°C (-5°F) and maximums reaching 20°C (68°F). Be prepared for some rain, as 76 mm (3.0 in) of precipitation is expected over 8 days. With an average humidity of 82%, it's a month to bundle up and enjoy cozy indoor activities!

January Temperature in Ballwin

In January in Ballwin, the average temperature is 0°C (33°F). Maximum temperatures can reach 20°C (68°F), while minimums can drop as low as -21°C (-5°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack accordingly for both cold and mild weather.

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

The chart illustrates January temperature patterns in Ballwin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ballwin, January typically has an average temperature of 0°C (33°F), with highs reaching up to 20°C (68°F) and lows dropping to around -21°C (-5°F).

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

January Precipitation in Ballwin

In Ballwin in January, the precipitation amount is 76 mm (3.0 in) spread over a duration of 8 days.

January Precipitation Trends in Ballwin

The chart displays monthly precipitation patterns in Ballwin, 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 Ballwin, January typically receives around 76 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.

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Millimeters (mm) Inches (in)

January Humidity in Ballwin

In Ballwin in January, humidity is 82%. With an average temperature of 0°C (33°F), this humidity feels like a damp chill that seeps into your bones, making outdoor adventures feel much colder than the mercury suggests, and reminding you to bundle up as you explore.

January Average Humidity in Ballwin

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

In Ballwin 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 Ballwin, you can check the information here.

Maximum UV Index Levels in Ballwin for January

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

Data source: Ballwin 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 Ballwin Compares to Other Months

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

This table compares monthly weather conditions in Ballwin, 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 (33°F)	76 mm (3.0 inches)	82%	moderate
February Weather	2°C (36°F)	82 mm (3.2 inches)	80%	moderate
March Weather	8°C (47°F)	131 mm (5.2 inches)	80%	high
April Weather	13°C (55°F)	128 mm (5.0 inches)	80%	very high
May Weather	19°C (67°F)	141 mm (5.5 inches)	82%	very high
June Weather	25°C (77°F)	95 mm (3.8 inches)	83%	extreme
July Weather	26°C (80°F)	93 mm (3.6 inches)	81%	very high
August Weather	25°C (76°F)	135 mm (5.3 inches)	80%	very high
September Weather	22°C (72°F)	57 mm (2.2 inches)	76%	very high
October Weather	15°C (59°F)	106 mm (4.2 inches)	76%	high
November Weather	7°C (45°F)	73 mm (2.9 inches)	85%	moderate
December Weather	4°C (40°F)	60 mm (2.4 inches)	86%	moderate