January Weather in Union, United States

Last updated: June 24, 2025

In January, the average temperature in Union, United States is a cool 8°C (46°F), with temperatures swinging from a chilly -11°C (12°F) to a delightful 26°C (79°F). Be prepared for 9 days of rain, with total precipitation reaching 95 mm (3.7 in). The atmosphere feels quite humid, with an average humidity level of 86%, ensuring you experience the unique climate of this fascinating locale.

January Temperature in Union

In January in Union, the average temperature is 8°C (46°F), with maximums reaching 26°C (79°F) and minimums plummeting as low as -11°C (12°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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 8°C (46°F), with highs reaching up to 26°C (79°F) and lows dropping to around -11°C (12°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 95 mm (3.7 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 95 mm (3.7 inches) of precipitation spread over approximately 9 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 Union

In Union in January humidity is 86%. With an average temperature of 8°C (46°F), this humidity feels like a damp chill enveloping you, making outdoor activities less enjoyable and requiring extra layers to stay comfortable while exploring.

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 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 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	8°C (46°F)	95 mm (3.7 inches)	86%	moderate
February Weather	10°C (51°F)	123 mm (4.8 inches)	85%	high
March Weather	13°C (56°F)	90 mm (3.6 inches)	84%	very high
April Weather	17°C (63°F)	108 mm (4.2 inches)	82%	very high
May Weather	22°C (72°F)	115 mm (4.5 inches)	83%	extreme
June Weather	25°C (77°F)	90 mm (3.5 inches)	82%	extreme
July Weather	27°C (81°F)	113 mm (4.5 inches)	80%	extreme
August Weather	26°C (79°F)	127 mm (5.0 inches)	74%	very high
September Weather	24°C (76°F)	115 mm (4.5 inches)	75%	very high
October Weather	19°C (67°F)	97 mm (3.8 inches)	79%	very high
November Weather	11°C (53°F)	96 mm (3.8 inches)	87%	high
December Weather	9°C (49°F)	130 mm (5.1 inches)	87%	moderate