January Weather in Harrisburg, United States

Last updated: June 24, 2025

In January, the average temperature in Harrisburg, United States hovers around 5°C (42°F). Expect chilly days, with minimums plunging to -11°C (12°F) and maximums reaching 16°C (61°F). Prepare for 160 mm (6.3 in) of precipitation spread over 16 days, contributing to an average humidity of 85%. Make sure to pack accordingly!

January Temperature in Harrisburg

In January in Harrisburg, the average temperature is 5°C (42°F). The maximum can reach 16°C (61°F) and the minimum can be as low as -11°C (12°F). Be prepared for a mix of chilly and mild weather, making it essential to pack layers for your travels.

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

The chart illustrates January temperature patterns in Harrisburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harrisburg, January typically has an average temperature of 5°C (42°F), with highs reaching up to 16°C (61°F) and lows dropping to around -11°C (12°F).

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

January Precipitation in Harrisburg

In Harrisburg in January, the total precipitation amount is 160 mm (6.3 in) spread over 16 days.

January Precipitation Trends in Harrisburg

The chart displays monthly precipitation patterns in Harrisburg, 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 Harrisburg, January typically receives around 160 mm (6.3 inches) of precipitation spread over approximately 16 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 Harrisburg

In Harrisburg in January, humidity is 85%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and requiring extra layers to stay warm while exploring.

January Average Humidity in Harrisburg

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

In Harrisburg in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Harrisburg, you can visit Hourly UV Index in Harrisburg.

Maximum UV Index Levels in Harrisburg for January

The chart shows the monthly maximum UV Index (UVI) for Harrisburg 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 Harrisburg typically reaches 2, which falls under the low exposure category.

Data source: Harrisburg 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 Harrisburg Compares to Other Months

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

This table compares monthly weather conditions in Harrisburg, 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 (42°F)	160 mm (6.3 inches)	85%	low
February Weather	5°C (41°F)	192 mm (7.5 inches)	84%	moderate
March Weather	7°C (45°F)	140 mm (5.5 inches)	85%	high
April Weather	10°C (50°F)	125 mm (4.9 inches)	83%	high
May Weather	13°C (56°F)	64 mm (2.5 inches)	83%	very high
June Weather	17°C (62°F)	48 mm (1.9 inches)	83%	very high
July Weather	20°C (68°F)	2 mm (0.1 inches)	82%	very high
August Weather	20°C (69°F)	6 mm (0.2 inches)	74%	very high
September Weather	17°C (63°F)	71 mm (2.8 inches)	71%	very high
October Weather	11°C (53°F)	91 mm (3.6 inches)	81%	moderate
November Weather	8°C (46°F)	143 mm (5.6 inches)	87%	moderate
December Weather	5°C (41°F)	195 mm (7.7 inches)	87%	low