January Weather in Chester, United States

Last updated: June 24, 2025

In Chester, United States, the average temperature in January hovers around -5°C (23°F), but it can swing from a chilly -28°C (-18°F) to a milder 15°C (60°F). Expect about 72 mm (2.9 in) of precipitation spread across 9 days, and prepare for a rather damp experience with an average humidity of 89%. Stay warm and dry!

January Temperature in Chester

In January in Chester, the average temperature is -5°C (23°F), with maximums reaching 15°C (60°F) and minimums plummeting to as low as -28°C (-18°F). This drastic variation in temperature makes it essential for travelers to pack accordingly and be prepared for both chilly and mild days.

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

The chart illustrates January temperature patterns in Chester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chester, January typically has an average temperature of -5°C (23°F), with highs reaching up to 15°C (60°F) and lows dropping to around -28°C (-18°F).

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

January Precipitation in Chester

In Chester in January, the total precipitation amount is 72 mm (2.9 in), occurring over the course of 9 days.

January Precipitation Trends in Chester

The chart displays monthly precipitation patterns in Chester, 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 Chester, January typically receives around 72 mm (2.9 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 Chester

In Chester in January, humidity is 89%. With an average temperature of -5°C (23°F), this humidity feels like a biting chill that seeps into your bones, making outdoor activities uncomfortable and prompting frequent breaks to warm up indoors.

January Average Humidity in Chester

This chart illustrates the average monthly humidity levels in Chester, 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 Chester is approximately 89%, 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 Chester

In Chester 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 Chester, you can check the information here.

Maximum UV Index Levels in Chester for January

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

Data source: Chester 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 Chester Compares to Other Months

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

This table compares monthly weather conditions in Chester, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (23°F)	72 mm (2.9 inches)	89%	moderate
February Weather	-4°C (26°F)	85 mm (3.3 inches)	88%	moderate
March Weather	0°C (32°F)	73 mm (2.9 inches)	86%	high
April Weather	7°C (44°F)	122 mm (4.8 inches)	84%	very high
May Weather	13°C (56°F)	85 mm (3.3 inches)	76%	very high
June Weather	19°C (66°F)	90 mm (3.5 inches)	72%	very high
July Weather	22°C (71°F)	126 mm (5.0 inches)	66%	very high
August Weather	20°C (69°F)	92 mm (3.6 inches)	64%	very high
September Weather	17°C (62°F)	79 mm (3.1 inches)	72%	high
October Weather	10°C (51°F)	142 mm (5.6 inches)	81%	high
November Weather	2°C (36°F)	101 mm (4.0 inches)	87%	moderate
December Weather	-3°C (27°F)	104 mm (4.1 inches)	84%	low