January Weather in Union, United States

Last updated: June 24, 2025

In January, the average temperature in Union, United States hovers around -1°C (31°F). Be prepared for a minimum chill of -25°C (-14°F) and a potential high of 20°C (69°F). During this time, expect around 72 mm (2.8 in) of precipitation spread over 9 days, with an average humidity of 88%.

January Temperature in Union

In January in Union, the average temperature is -1°C (31°F). Maximums can reach 20°C (69°F) and minimums can be as low as -25°C (-14°F). Travelers should be prepared for a wide range of temperatures, from chilly winter conditions to surprisingly mild days.

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

The chart illustrates January temperature patterns in Union, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Union, January typically has an average temperature of -1°C (31°F), with highs reaching up to 20°C (69°F) and lows dropping to around -25°C (-14°F).

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

January Precipitation in Union

In Union in January, the precipitation amount is 72 mm (2.8 in) over the course of 9 days.

January Precipitation Trends in Union

The chart displays monthly precipitation patterns in Union, 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 Union, January typically receives around 72 mm (2.8 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 Union

In Union in January, humidity is 88%. With an average temperature of -1°C (31°F), this humidity feels like a biting cold that penetrates your clothing, making outdoor exploration challenging and the air clingy, adding an extra chill that can make you feel even colder than the temperature suggests.

January Average Humidity in Union

This chart illustrates the average monthly humidity levels in Union, 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 Union 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 Union

In Union 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 Union, you can check the information here.

Maximum UV Index Levels in Union for January

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

Data source: Union 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 Union Compares to Other Months

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

This table compares monthly weather conditions in Union, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (31°F)	72 mm (2.8 inches)	88%	moderate
February Weather	1°C (34°F)	97 mm (3.8 inches)	88%	moderate
March Weather	6°C (42°F)	106 mm (4.2 inches)	87%	high
April Weather	11°C (52°F)	98 mm (3.9 inches)	85%	very high
May Weather	18°C (64°F)	129 mm (5.1 inches)	81%	very high
June Weather	22°C (72°F)	120 mm (4.7 inches)	82%	very high
July Weather	24°C (76°F)	100 mm (3.9 inches)	81%	very high
August Weather	23°C (74°F)	90 mm (3.5 inches)	73%	very high
September Weather	21°C (69°F)	86 mm (3.4 inches)	73%	very high
October Weather	14°C (58°F)	99 mm (3.9 inches)	78%	high
November Weather	5°C (42°F)	94 mm (3.7 inches)	89%	moderate
December Weather	2°C (36°F)	87 mm (3.4 inches)	87%	moderate