January Weather in Johnstown, United States

Last updated: June 24, 2025

In Johnstown, United States, the average temperature in January hovers around -2°C (28°F). Expect some chilly extremes, with minimums dipping as low as -26°C (-14°F), while occasional highs can reach up to 19°C (66°F). During this period, expect about 91 mm (3.6 in) of precipitation spread across 15 days, all amidst a notable average humidity of 89%. Stay warm and prepared for the wet conditions!

January Temperature in Johnstown

In January in Johnstown, the average temperature is -2°C (28°F). Maximum temperatures can reach 19°C (66°F), while minimums can drop to as low as -26°C (-14°F). This unpredictable weather makes it essential for travelers to prepare for a wide range of conditions.

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

The chart illustrates January temperature patterns in Johnstown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Johnstown, January typically has an average temperature of -2°C (28°F), with highs reaching up to 19°C (66°F) and lows dropping to around -26°C (-14°F).

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

January Precipitation in Johnstown

In Johnstown in January, the total precipitation amount is 91 mm (3.6 in) over a span of 15 days.

January Precipitation Trends in Johnstown

The chart displays monthly precipitation patterns in Johnstown, 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 Johnstown, January typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 15 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 Johnstown

In Johnstown in January, humidity is 89%. With an average temperature of -2°C (28°F), this humidity feels like a heavy blanket, making it difficult to stay warm while traveling outdoors.

January Average Humidity in Johnstown

This chart illustrates the average monthly humidity levels in Johnstown, 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 Johnstown is approximately 89%, 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 Johnstown

In Johnstown 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 Johnstown, you can check the information here.

Maximum UV Index Levels in Johnstown for January

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

Data source: Johnstown 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 Johnstown Compares to Other Months

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

This table compares monthly weather conditions in Johnstown, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (28°F)	91 mm (3.6 inches)	89%	moderate
February Weather	0°C (33°F)	131 mm (5.1 inches)	90%	moderate
March Weather	4°C (39°F)	114 mm (4.5 inches)	89%	high
April Weather	9°C (49°F)	133 mm (5.2 inches)	88%	very high
May Weather	15°C (60°F)	152 mm (6.0 inches)	80%	very high
June Weather	19°C (67°F)	145 mm (5.7 inches)	79%	very high
July Weather	22°C (72°F)	121 mm (4.8 inches)	74%	very high
August Weather	21°C (70°F)	98 mm (3.9 inches)	64%	very high
September Weather	18°C (65°F)	126 mm (5.0 inches)	67%	very high
October Weather	12°C (55°F)	115 mm (4.5 inches)	81%	high
November Weather	4°C (40°F)	91 mm (3.6 inches)	89%	moderate
December Weather	1°C (34°F)	115 mm (4.5 inches)	88%	low