January Weather in Harrisburg, United States

Last updated: June 24, 2025

In January, the average temperature in Harrisburg, United States hovers around 1°C (34°F), with extremes ranging from a brisk -16°C (4°F) to a mild 20°C (68°F). Expect 64 mm (2.5 in) of precipitation spread over about 8 days, and high humidity levels averaging 87%. Be prepared for a chilly and damp atmosphere!

January Temperature in Harrisburg

In January in Harrisburg, the average temperature is 1°C (34°F), with maximums reaching 20°C (68°F) and minimums dropping as low as -16°C (4°F). Travelers should be prepared for a wide range of temperatures and varying weather conditions during their visit.

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 1°C (34°F), with highs reaching up to 20°C (68°F) and lows dropping to around -16°C (4°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 64 mm (2.5 in) over the course of 8 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 64 mm (2.5 inches) of precipitation spread over approximately 8 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 87%. With an average temperature of 1°C (34°F), this humidity feels like a chilling blanket enveloping you, making every step outside feel heavy and damp, and leaving you longing for warmth and comfort while 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 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 Harrisburg

In Harrisburg 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 Harrisburg, you can check the information here.

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 3, 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	1°C (34°F)	64 mm (2.5 inches)	87%	moderate
February Weather	3°C (37°F)	99 mm (3.9 inches)	85%	moderate
March Weather	6°C (43°F)	94 mm (3.7 inches)	85%	high
April Weather	12°C (53°F)	102 mm (4.0 inches)	83%	very high
May Weather	17°C (63°F)	121 mm (4.8 inches)	75%	very high
June Weather	22°C (72°F)	92 mm (3.6 inches)	73%	very high
July Weather	25°C (78°F)	132 mm (5.2 inches)	65%	very high
August Weather	24°C (76°F)	107 mm (4.2 inches)	62%	very high
September Weather	21°C (69°F)	116 mm (4.6 inches)	66%	very high
October Weather	15°C (59°F)	105 mm (4.1 inches)	79%	high
November Weather	7°C (45°F)	86 mm (3.4 inches)	87%	moderate
December Weather	3°C (38°F)	88 mm (3.5 inches)	85%	low