January Weather in Hamilton, United States

Last updated: June 24, 2025

In Hamilton, United States, the average temperature for January hovers around 9°C (49°F). This month can bring a chill, with minimums plunging to -10°C (14°F), while daytime highs can reach a pleasant 26°C (79°F). Expect about 114 mm (4.5 in) of precipitation over roughly 9 days, and remember that the air will feel quite humid, with an average humidity of 86%.

January Temperature in Hamilton

In January in Hamilton, the average temperature is 9°C (49°F), with maximums reaching up to 26°C (79°F) and minimums potentially dropping to as low as -10°C (14°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to enjoy their stay.

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

The chart illustrates January temperature patterns in Hamilton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hamilton, January typically has an average temperature of 9°C (49°F), with highs reaching up to 26°C (79°F) and lows dropping to around -10°C (14°F).

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

January Precipitation in Hamilton

In Hamilton in January, the precipitation amount is 114 mm (4.5 in) over the course of 9 days.

January Precipitation Trends in Hamilton

The chart displays monthly precipitation patterns in Hamilton, 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 Hamilton, January typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 9 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 Hamilton

In Hamilton in January, humidity is 86%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill in the air, making travel uncomfortable as the moisture clings to your skin and thickens the atmosphere, creating a sense of heaviness that can tire you quickly.

January Average Humidity in Hamilton

This chart illustrates the average monthly humidity levels in Hamilton, 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 Hamilton is approximately 86%, 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 Hamilton

In Hamilton in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Hamilton for better planning.

Maximum UV Index Levels in Hamilton for January

The chart shows the monthly maximum UV Index (UVI) for Hamilton 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 Hamilton typically reaches 4, which falls under the moderate exposure category.

Data source: Hamilton 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 Hamilton Compares to Other Months

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

This table compares monthly weather conditions in Hamilton, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	114 mm (4.5 inches)	86%	moderate
February Weather	12°C (55°F)	118 mm (4.6 inches)	84%	high
March Weather	15°C (59°F)	92 mm (3.6 inches)	83%	very high
April Weather	18°C (65°F)	106 mm (4.2 inches)	81%	very high
May Weather	22°C (73°F)	105 mm (4.1 inches)	81%	extreme
June Weather	25°C (78°F)	121 mm (4.8 inches)	81%	extreme
July Weather	27°C (80°F)	112 mm (4.4 inches)	83%	extreme
August Weather	26°C (80°F)	126 mm (5.0 inches)	81%	extreme
September Weather	25°C (77°F)	100 mm (3.9 inches)	82%	very high
October Weather	20°C (69°F)	110 mm (4.3 inches)	78%	very high
November Weather	13°C (55°F)	76 mm (3.0 inches)	86%	high
December Weather	10°C (51°F)	132 mm (5.2 inches)	89%	moderate