January Weather in Union, United States

Last updated: June 24, 2025

In Union, United States, the average temperature in January hovers around 9°C (48°F), creating a cool climate. Expect a range that swings from a chilly -13°C (9°F) at its lowest to a mild 27°C (81°F) at its peak. During this month, precipitation averages 105 mm (4.1 in) spread across approximately 8 days, accompanied by an average humidity of 85%. Whether you’re looking to embrace the brisk air or prepare for the occasional shower, be ready for a diverse weather experience!

January Temperature in Union

In January in Union, the average temperature is 9°C (48°F), with maximums reaching 27°C (81°F) and minimums dropping as low as -13°C (9°F). This wide temperature range means travelers should be prepared for both warm and cold conditions during their visit.

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 9°C (48°F), with highs reaching up to 27°C (81°F) and lows dropping to around -13°C (9°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 105 mm (4.1 in) over the course of 8 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 105 mm (4.1 inches) of precipitation spread over approximately 8 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 85%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill enveloping you, making outdoor activities less enjoyable and requiring extra layers to stay warm and comfortable while traveling.

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 85%, 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 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 Union for better planning.

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 4, 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	9°C (48°F)	105 mm (4.1 inches)	85%	moderate
February Weather	12°C (54°F)	156 mm (6.1 inches)	84%	high
March Weather	16°C (60°F)	116 mm (4.6 inches)	82%	very high
April Weather	18°C (65°F)	136 mm (5.4 inches)	82%	extreme
May Weather	23°C (74°F)	122 mm (4.8 inches)	82%	extreme
June Weather	26°C (79°F)	163 mm (6.4 inches)	79%	extreme
July Weather	27°C (81°F)	121 mm (4.8 inches)	82%	extreme
August Weather	27°C (81°F)	127 mm (5.0 inches)	77%	extreme
September Weather	25°C (78°F)	95 mm (3.8 inches)	74%	very high
October Weather	20°C (69°F)	100 mm (3.9 inches)	73%	very high
November Weather	13°C (55°F)	70 mm (2.7 inches)	85%	high
December Weather	11°C (52°F)	121 mm (4.8 inches)	88%	moderate