January Weather in Merrillan, United States

Last updated: June 24, 2025

In Merrillan, United States, the average temperature for January hovers around -8°C (18°F), with extremes ranging from a chilly -32°C (-26°F) to a milder 8°C (47°F). Expect 33 mm (1.3 in) of precipitation over approximately 6 days, and prepare for a high average humidity of 88%.

January Temperature in Merrillan

In January in Merrillan, the average temperature is -8°C (18°F). Maximum temperatures can reach 8°C (47°F), while minimums can drop as low as -32°C (-26°F). Travelers should be prepared for cold weather and dress warmly, as the temperature can vary significantly.

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

The chart illustrates January temperature patterns in Merrillan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Merrillan, January typically has an average temperature of -8°C (18°F), with highs reaching up to 8°C (47°F) and lows dropping to around -32°C (-26°F).

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

January Precipitation in Merrillan

In Merrillan, in January, the precipitation amount is 33 mm (1.3 in) over the course of 6 days.

January Precipitation Trends in Merrillan

The chart displays monthly precipitation patterns in Merrillan, 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 Merrillan, January typically receives around 33 mm (1.3 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 Merrillan

In Merrillan in January humidity is 88%. With an average temperature of -8°C (18°F), this humidity feels like a biting chill that seeps into your bones, making it essential to dress warmly and plan for quick indoor breaks while traveling.

January Average Humidity in Merrillan

This chart illustrates the average monthly humidity levels in Merrillan, 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 Merrillan is approximately 88%, 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 Merrillan

In Merrillan 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 Merrillan, you can visit Hourly UV Index in Merrillan.

Maximum UV Index Levels in Merrillan for January

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

Data source: Merrillan 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 Merrillan Compares to Other Months

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

This table compares monthly weather conditions in Merrillan, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-8°C (18°F)	33 mm (1.3 inches)	88%	low
February Weather	-7°C (19°F)	52 mm (2.1 inches)	89%	moderate
March Weather	1°C (34°F)	56 mm (2.2 inches)	86%	moderate
April Weather	6°C (44°F)	95 mm (3.8 inches)	85%	very high
May Weather	15°C (58°F)	130 mm (5.1 inches)	79%	very high
June Weather	20°C (69°F)	135 mm (5.3 inches)	80%	very high
July Weather	22°C (73°F)	112 mm (4.4 inches)	80%	very high
August Weather	20°C (69°F)	136 mm (5.4 inches)	78%	very high
September Weather	17°C (63°F)	97 mm (3.8 inches)	80%	high
October Weather	9°C (49°F)	119 mm (4.7 inches)	84%	moderate
November Weather	1°C (34°F)	53 mm (2.1 inches)	89%	moderate
December Weather	-4°C (25°F)	50 mm (2.0 inches)	85%	low