January Weather in South Williamsport, United States

Last updated: June 24, 2025

In South Williamsport, United States, the average temperature in January hovers around -2°C (29°F). Expect to experience a wide temperature range, with minima dipping as low as -25°C (-12°F) and maxima reaching up to 17°C (63°F). During this month, precipitation averages 74 mm (2.9 in) spread over 9 days, while the air is notably humid at 87%.

January Temperature in South Williamsport

In January in South Williamsport, the average temperature is -2°C (29°F). The maximum can reach 17°C (63°F) and the minimum can be as low as -25°C (-12°F). Be prepared for a wide range of temperatures and pack accordingly for your travels.

January Weather in South Williamsport: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in South Williamsport, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Williamsport, January typically has an average temperature of -2°C (29°F), with highs reaching up to 17°C (63°F) and lows dropping to around -25°C (-12°F).

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

January Precipitation in South Williamsport

In South Williamsport in January, the precipitation amount is 74 mm (2.9 in), which occurs over a span of 9 days.

January Precipitation Trends in South Williamsport

The chart displays monthly precipitation patterns in South Williamsport, 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 South Williamsport, January typically receives around 74 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 South Williamsport

In South Williamsport in January humidity is 87%. With an average temperature of -2°C (29°F), this humidity feels like an uncomfortable chill that seeps into your bones, making it challenging to enjoy outdoor activities.

January Average Humidity in South Williamsport

This chart illustrates the average monthly humidity levels in South Williamsport, 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 South Williamsport is approximately 87%, 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 South Williamsport

In South Williamsport 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 South Williamsport, you can check the information here.

Maximum UV Index Levels in South Williamsport for January

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

Data source: South Williamsport 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 South Williamsport Compares to Other Months

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

This table compares monthly weather conditions in South Williamsport, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	74 mm (2.9 inches)	87%	moderate
February Weather	-1°C (31°F)	99 mm (3.9 inches)	85%	moderate
March Weather	3°C (38°F)	89 mm (3.5 inches)	85%	high
April Weather	9°C (49°F)	115 mm (4.5 inches)	83%	very high
May Weather	15°C (60°F)	137 mm (5.4 inches)	75%	very high
June Weather	20°C (68°F)	105 mm (4.1 inches)	73%	very high
July Weather	23°C (74°F)	146 mm (5.8 inches)	65%	very high
August Weather	22°C (72°F)	113 mm (4.4 inches)	62%	very high
September Weather	18°C (65°F)	121 mm (4.8 inches)	66%	very high
October Weather	13°C (55°F)	135 mm (5.3 inches)	79%	high
November Weather	5°C (40°F)	97 mm (3.8 inches)	87%	moderate
December Weather	1°C (34°F)	94 mm (3.7 inches)	85%	low