January Weather in Walnut, United States

Last updated: June 24, 2025

In January, the average temperature in Walnut, United States hovers around -4°C (25°F). Residents can expect a wide temperature range, with minimums plunging to -32°C (-25°F) and maximums reaching up to 13°C (56°F). Precipitation is moderate, totaling 58 mm (2.3 in) over approximately 8 days, all while the air remains quite humid, with an average humidity of 82%.

January Temperature in Walnut

In January in Walnut, the average temperature is -4°C (25°F), with maximums reaching 13°C (56°F) and minimums dipping as low as -32°C (-25°F). Travelers should be prepared for a wide range of temperatures during their visit.

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

The chart illustrates January temperature patterns in Walnut, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Walnut, January typically has an average temperature of -4°C (25°F), with highs reaching up to 13°C (56°F) and lows dropping to around -32°C (-25°F).

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

January Precipitation in Walnut

In Walnut in January, the precipitation amount is 58 mm (2.3 in) over a span of 8 days.

January Precipitation Trends in Walnut

The chart displays monthly precipitation patterns in Walnut, 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 Walnut, January typically receives around 58 mm (2.3 inches) of precipitation spread over approximately 8 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 Walnut

In Walnut in January, humidity is 82%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and necessitating warm, layered clothing to shield against the damp cold.

January Average Humidity in Walnut

This chart illustrates the average monthly humidity levels in Walnut, 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 Walnut is approximately 82%, 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 Walnut

In Walnut 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 Walnut, you can check the information here.

Maximum UV Index Levels in Walnut for January

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

Data source: Walnut 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 Walnut Compares to Other Months

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

This table compares monthly weather conditions in Walnut, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	58 mm (2.3 inches)	82%	moderate
February Weather	-3°C (27°F)	62 mm (2.5 inches)	83%	moderate
March Weather	4°C (40°F)	94 mm (3.7 inches)	84%	high
April Weather	10°C (49°F)	114 mm (4.5 inches)	85%	very high
May Weather	17°C (62°F)	173 mm (6.8 inches)	79%	very high
June Weather	23°C (73°F)	146 mm (5.7 inches)	82%	very high
July Weather	24°C (76°F)	100 mm (3.9 inches)	80%	very high
August Weather	23°C (74°F)	68 mm (2.7 inches)	81%	very high
September Weather	20°C (69°F)	110 mm (4.3 inches)	80%	very high
October Weather	12°C (55°F)	127 mm (5.0 inches)	82%	high
November Weather	4°C (39°F)	55 mm (2.2 inches)	88%	moderate
December Weather	0°C (33°F)	49 mm (1.9 inches)	84%	low