January Weather in Sunbury, United States

Last updated: June 24, 2025

In Sunbury, United States, the average temperature in January hovers around -1°C (30°F). However, temperatures can range dramatically, dipping as low as -23°C (-10°F) or rising to a maximum of 21°C (69°F). Expect significant precipitation during this month, with about 86 mm (3.4 in) falling over 10 days. The average humidity is high at 88%, enhancing the chilly atmosphere.

January Temperature in Sunbury

In January in Sunbury, the average temperature is -1°C (30°F). Maximums can reach 21°C (69°F) and minimums can be as low as -23°C (-10°F). Travelers should be prepared for a wide range of temperatures, so pack layers to enjoy both chilly and warmer moments during your visit.

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

The chart illustrates January temperature patterns in Sunbury, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sunbury, January typically has an average temperature of -1°C (30°F), with highs reaching up to 21°C (69°F) and lows dropping to around -23°C (-10°F).

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

January Precipitation in Sunbury

In Sunbury in January, the precipitation amount is 86 mm (3.4 in) over the course of 10 days.

January Precipitation Trends in Sunbury

The chart displays monthly precipitation patterns in Sunbury, 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 Sunbury, January typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 10 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 Sunbury

In Sunbury in January humidity is 88%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that penetrates through your layers, making travel uncomfortable as every gust of wind becomes a sharp reminder of the cold and damp air surrounding you.

January Average Humidity in Sunbury

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

In Sunbury 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 Sunbury, you can check the information here.

Maximum UV Index Levels in Sunbury for January

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

Data source: Sunbury 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 Sunbury Compares to Other Months

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

This table compares monthly weather conditions in Sunbury, 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 (30°F)	86 mm (3.4 inches)	88%	moderate
February Weather	1°C (34°F)	110 mm (4.3 inches)	87%	moderate
March Weather	5°C (42°F)	111 mm (4.4 inches)	87%	high
April Weather	11°C (51°F)	125 mm (4.9 inches)	87%	very high
May Weather	17°C (63°F)	129 mm (5.1 inches)	81%	very high
June Weather	22°C (71°F)	151 mm (5.9 inches)	82%	very high
July Weather	24°C (75°F)	114 mm (4.5 inches)	81%	very high
August Weather	23°C (73°F)	76 mm (3.0 inches)	78%	very high
September Weather	20°C (68°F)	88 mm (3.4 inches)	78%	very high
October Weather	14°C (57°F)	102 mm (4.0 inches)	82%	high
November Weather	5°C (41°F)	100 mm (3.9 inches)	89%	moderate
December Weather	2°C (36°F)	104 mm (4.1 inches)	86%	low