January Weather in Ajax, Canada

Last updated: June 18, 2025

In January, the average temperature in Ajax, Canada hovers around -3°C (28°F), with extremes ranging from a frigid -21°C (-6°F) to a milder 9°C (48°F). Expect 84 mm (3.3 in) of precipitation over approximately 11 days, coupled with a consistently high average humidity of 91%. Stay warm and prepared for a wet winter!

January Temperature in Ajax

In January, Ajax experiences an average temperature of -3°C (28°F), with maximums that can reach up to 9°C (48°F) and minimums dropping as low as -21°C (-6°F). Travelers should be prepared for cold weather conditions and dress in layers to stay comfortable during their visit.

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

The chart illustrates January temperature patterns in Ajax, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ajax, January typically has an average temperature of -3°C (28°F), with highs reaching up to 9°C (48°F) and lows dropping to around -21°C (-6°F).

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

January Precipitation in Ajax

In Ajax, in January, the precipitation amount is 84 mm (3.3 in) during a period of 11 days.

January Precipitation Trends in Ajax

The chart displays monthly precipitation patterns in Ajax, 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 Ajax, January typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 11 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 Ajax

In Ajax in January humidity is 91%. With an average temperature of -3°C (28°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and requiring extra layers to brace against the damp cold.

January Average Humidity in Ajax

This chart illustrates the average monthly humidity levels in Ajax, 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 Ajax is approximately 91%, 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 Ajax

In Ajax in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Ajax, you can visit Hourly UV Index in Ajax.

Maximum UV Index Levels in Ajax for January

The chart shows the monthly maximum UV Index (UVI) for Ajax 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 Ajax typically reaches 2, which falls under the low exposure category.

Data source: Ajax 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 Ajax Compares to Other Months

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

This table compares monthly weather conditions in Ajax, 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 (28°F)	84 mm (3.3 inches)	91%	low
February Weather	-2°C (28°F)	88 mm (3.5 inches)	91%	moderate
March Weather	1°C (33°F)	77 mm (3.0 inches)	88%	moderate
April Weather	5°C (41°F)	122 mm (4.8 inches)	88%	very high
May Weather	9°C (49°F)	105 mm (4.1 inches)	82%	very high
June Weather	16°C (60°F)	77 mm (3.0 inches)	79%	very high
July Weather	21°C (70°F)	70 mm (2.7 inches)	77%	very high
August Weather	22°C (71°F)	78 mm (3.1 inches)	72%	very high
September Weather	18°C (65°F)	73 mm (2.9 inches)	76%	high
October Weather	13°C (55°F)	118 mm (4.6 inches)	83%	moderate
November Weather	5°C (41°F)	102 mm (4.0 inches)	88%	moderate
December Weather	1°C (33°F)	96 mm (3.8 inches)	87%	low