January Weather in Harrisburg, United States

Last updated: June 24, 2025

In January, the average temperature in Harrisburg, United States hovers around 6°C (44°F), with extremes ranging from a brisk -12°C (10°F) to a mild 25°C (77°F). Expect 92 mm (3.6 in) of precipitation over about 9 days, contributing to a notable average humidity of 86%.

January Temperature in Harrisburg

In January in Harrisburg, the average temperature is 6°C (44°F), with maximums reaching 25°C (77°F) and minimums dropping as low as -12°C (10°F). Be prepared for a wide range of temperatures when traveling to Harrisburg during this month.

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 6°C (44°F), with highs reaching up to 25°C (77°F) and lows dropping to around -12°C (10°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 precipitation amount is 92 mm (3.6 in) during 9 days, indicating a relatively wet period for the region.

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 92 mm (3.6 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 Harrisburg

In Harrisburg in January, humidity is 86%. With an average temperature of 6°C (44°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities quite uncomfortable for traveling.

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 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 Harrisburg

In Harrisburg 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 Harrisburg for better planning.

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 4, which falls under the moderate 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	6°C (44°F)	92 mm (3.6 inches)	86%	moderate
February Weather	9°C (49°F)	116 mm (4.6 inches)	85%	high
March Weather	12°C (54°F)	83 mm (3.3 inches)	84%	very high
April Weather	17°C (62°F)	103 mm (4.0 inches)	82%	very high
May Weather	22°C (71°F)	113 mm (4.5 inches)	83%	very high
June Weather	25°C (77°F)	82 mm (3.2 inches)	82%	extreme
July Weather	27°C (81°F)	114 mm (4.5 inches)	80%	very high
August Weather	26°C (79°F)	105 mm (4.1 inches)	74%	very high
September Weather	23°C (75°F)	133 mm (5.2 inches)	75%	very high
October Weather	18°C (65°F)	92 mm (3.6 inches)	79%	very high
November Weather	10°C (51°F)	90 mm (3.5 inches)	87%	moderate
December Weather	8°C (47°F)	120 mm (4.7 inches)	87%	moderate