January Weather in Waterloo, United States

Last updated: June 24, 2025

In Waterloo, United States, the average temperature in January hovers around -6°C (22°F). This chilly month can see temperatures plummeting to a minimum of -32°C (-25°F), while occasionally reaching a warmer maximum of 11°C (52°F). Expect 51 mm (2.0 in) of precipitation spread over 7 days, paired with an average humidity of a brisk 85%. Stay warm and prepared for winter conditions!

January Temperature in Waterloo

In January in Waterloo, the average temperature is -6°C (22°F). The maximum can reach 11°C (52°F), while the minimum can drop as low as -32°C (-25°F). Travelers should be prepared for extremely cold conditions and pack accordingly to enjoy their visit.

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

The chart illustrates January temperature patterns in Waterloo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Waterloo, January typically has an average temperature of -6°C (22°F), with highs reaching up to 11°C (52°F) and lows dropping to around -32°C (-25°F).

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

January Precipitation in Waterloo

In Waterloo in January, the precipitation amount is 51 mm (2.0 in) over a period of 7 days.

January Precipitation Trends in Waterloo

The chart displays monthly precipitation patterns in Waterloo, 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 Waterloo, January typically receives around 51 mm (2.0 inches) of precipitation spread over approximately 7 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 Waterloo

In Waterloo in January humidity is 85%. With an average temperature of -6°C (22°F), this humidity feels like an icy mist clinging to your skin, making outdoor activities uncomfortably chilly and causing your breath to cloud in the cold air, leaving you yearning for warmth and cozy indoor retreats while traveling.

January Average Humidity in Waterloo

This chart illustrates the average monthly humidity levels in Waterloo, 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 Waterloo is approximately 85%, 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 Waterloo

In Waterloo 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 Waterloo, you can check the information here.

Maximum UV Index Levels in Waterloo for January

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

Data source: Waterloo 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 Waterloo Compares to Other Months

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

This table compares monthly weather conditions in Waterloo, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (22°F)	51 mm (2.0 inches)	85%	moderate
February Weather	-5°C (22°F)	51 mm (2.0 inches)	85%	moderate
March Weather	2°C (36°F)	57 mm (2.3 inches)	85%	moderate
April Weather	8°C (46°F)	100 mm (4.0 inches)	85%	very high
May Weather	15°C (59°F)	125 mm (4.9 inches)	78%	very high
June Weather	21°C (70°F)	114 mm (4.5 inches)	80%	very high
July Weather	23°C (75°F)	102 mm (4.0 inches)	78%	very high
August Weather	22°C (71°F)	96 mm (3.8 inches)	76%	very high
September Weather	18°C (65°F)	102 mm (4.0 inches)	79%	very high
October Weather	11°C (51°F)	115 mm (4.5 inches)	83%	moderate
November Weather	2°C (37°F)	43 mm (1.7 inches)	88%	moderate
December Weather	-2°C (29°F)	46 mm (1.8 inches)	81%	low