January Weather in Harrisburg, United States

Last updated: June 24, 2025

In January, the average temperature in Harrisburg, United States hovers around -7°C (20°F). While it can dip as low as -32°C (-25°F), temperatures may rise to a maximum of 11°C (52°F). Expect a modest precipitation of 21 mm (0.8 in) spread over about 4 days, coupled with a high average humidity of 80%.

January Temperature in Harrisburg

In January in Harrisburg, the average temperature is -7°C (20°F). The maximum can reach 11°C (52°F), while the minimum can be as low as -32°C (-25°F). Travelers should prepare for cold weather and pack accordingly when visiting during this time.

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 -7°C (20°F), with highs reaching up to 11°C (52°F) and lows dropping to around -32°C (-25°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 21 mm (0.8 in) over a span of 4 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 21 mm (0.8 inches) of precipitation spread over approximately 4 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 80%. With an average temperature of -7°C (20°F), this humidity feels like an icy fog enveloping you, making outdoor travel uncomfortable as your breath freezes in the air and every step forward seems to draw out more chill than the last.

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 80%, 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	-7°C (20°F)	21 mm (0.8 inches)	80%	low
February Weather	-7°C (20°F)	24 mm (0.9 inches)	84%	moderate
March Weather	2°C (35°F)	65 mm (2.6 inches)	75%	moderate
April Weather	7°C (45°F)	82 mm (3.2 inches)	79%	very high
May Weather	15°C (59°F)	128 mm (5.0 inches)	74%	very high
June Weather	23°C (73°F)	85 mm (3.3 inches)	81%	extreme
July Weather	24°C (75°F)	77 mm (3.0 inches)	82%	very high
August Weather	22°C (72°F)	94 mm (3.7 inches)	80%	very high
September Weather	18°C (65°F)	107 mm (4.2 inches)	75%	very high
October Weather	9°C (48°F)	79 mm (3.1 inches)	77%	moderate
November Weather	1°C (35°F)	25 mm (1.0 inches)	85%	moderate
December Weather	-3°C (26°F)	39 mm (1.5 inches)	83%	low