January Weather in Mercersburg, United States

Last updated: June 24, 2025

In Mercersburg, United States, the average temperature in January hovers around 1°C (34°F), with a minimum dip to -18°C (1°F) and a cheerful peak of 20°C (67°F). Expect some precipitation, totaling about 63 mm (2.5 in) over 8 days, while the average humidity remains high at 86%.

January Temperature in Mercersburg

In January in Mercersburg, the average temperature is 1°C (34°F). Maximum temperatures can reach 20°C (67°F), while minimums can drop as low as -18°C (1°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates January temperature patterns in Mercersburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mercersburg, January typically has an average temperature of 1°C (34°F), with highs reaching up to 20°C (67°F) and lows dropping to around -18°C (1°F).

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

January Precipitation in Mercersburg

In Mercersburg in January, the precipitation amount is 63 mm (2.5 in) spread over 8 days.

January Precipitation Trends in Mercersburg

The chart displays monthly precipitation patterns in Mercersburg, 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 Mercersburg, January typically receives around 63 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 Mercersburg

In Mercersburg in January, humidity is 86%. With an average temperature of 1°C (34°F), this humidity feels like a chilling embrace, making outdoor adventures brisk and invigorating but challenging for travel.

January Average Humidity in Mercersburg

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

In Mercersburg 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 Mercersburg, you can check the information here.

Maximum UV Index Levels in Mercersburg for January

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

Data source: Mercersburg 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 Mercersburg Compares to Other Months

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

This table compares monthly weather conditions in Mercersburg, 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)	63 mm (2.5 inches)	86%	moderate
February Weather	3°C (37°F)	95 mm (3.8 inches)	86%	moderate
March Weather	6°C (43°F)	87 mm (3.4 inches)	86%	high
April Weather	12°C (54°F)	107 mm (4.2 inches)	84%	very high
May Weather	18°C (64°F)	126 mm (5.0 inches)	78%	very high
June Weather	22°C (72°F)	105 mm (4.1 inches)	79%	very high
July Weather	25°C (78°F)	130 mm (5.1 inches)	70%	very high
August Weather	24°C (75°F)	107 mm (4.2 inches)	59%	very high
September Weather	21°C (69°F)	122 mm (4.8 inches)	68%	very high
October Weather	15°C (59°F)	110 mm (4.3 inches)	80%	high
November Weather	6°C (44°F)	76 mm (3.0 inches)	86%	moderate
December Weather	3°C (38°F)	96 mm (3.8 inches)	85%	moderate