January Weather in Waterloo, United States

Last updated: June 24, 2025

In January, the average temperature in Waterloo, United States hovers around -7°C (20°F). Expect chilling lows of -33°C (-28°F) and occasional highs reaching 12°C (54°F). Precipitation averages 42 mm (1.6 in) spread over 6 days, while the air remains quite damp with an average humidity of 84%.

January Temperature in Waterloo

In January in Waterloo, the average temperature is -7°C (20°F). The maximum can reach 12°C (54°F), while the minimum can drop to as low as -33°C (-28°F). Be prepared for a wide range of temperatures when traveling to Waterloo during this month.

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 -7°C (20°F), with highs reaching up to 12°C (54°F) and lows dropping to around -33°C (-28°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 total precipitation amount is 42 mm (1.6 in) over a span of 6 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 42 mm (1.6 inches) of precipitation spread over approximately 6 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 84%. With an average temperature of -7°C (20°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and requiring extra layers to stay warm and dry.

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 84%, 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	-7°C (20°F)	42 mm (1.6 inches)	84%	moderate
February Weather	-6°C (21°F)	52 mm (2.0 inches)	85%	moderate
March Weather	3°C (37°F)	73 mm (2.9 inches)	84%	high
April Weather	8°C (47°F)	78 mm (3.1 inches)	83%	very high
May Weather	16°C (61°F)	174 mm (6.8 inches)	75%	very high
June Weather	22°C (73°F)	144 mm (5.7 inches)	79%	extreme
July Weather	24°C (75°F)	107 mm (4.2 inches)	75%	very high
August Weather	22°C (71°F)	94 mm (3.7 inches)	69%	very high
September Weather	19°C (66°F)	124 mm (4.9 inches)	74%	very high
October Weather	11°C (51°F)	138 mm (5.5 inches)	79%	moderate
November Weather	2°C (37°F)	49 mm (1.9 inches)	88%	moderate
December Weather	-2°C (29°F)	36 mm (1.4 inches)	82%	moderate