January Weather in Keystone, United States

Last updated: June 24, 2025

In January, the average temperature in Keystone, United States hovers around -6°C (21°F), with a minimum that can plunge to -32°C (-25°F) and a maximum reaching up to 13°C (55°F). The area experiences approximately 45 mm (1.8 in) of precipitation over about 7 days, and the air is notably humid with an average humidity of 81%.

January Temperature in Keystone

In January in Keystone, the average temperature is -6°C (21°F). Maximums can reach 13°C (55°F), while minimums can drop to as low as -32°C (-25°F). Be prepared for a wide range of temperatures to ensure an enjoyable and comfortable trip.

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

The chart illustrates January temperature patterns in Keystone, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Keystone, January typically has an average temperature of -6°C (21°F), with highs reaching up to 13°C (55°F) and lows dropping to around -32°C (-25°F).

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

January Precipitation in Keystone

In Keystone in January, the precipitation amount is 45 mm (1.8 in) spread over a duration of 7 days.

January Precipitation Trends in Keystone

The chart displays monthly precipitation patterns in Keystone, 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 Keystone, January typically receives around 45 mm (1.8 inches) of precipitation spread over approximately 7 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 Keystone

In Keystone in January humidity is 81%. With an average temperature of -6°C (21°F), this humidity feels like an icy mist wrapping around you, making travel outdoors quite uncomfortable and requiring extra layers to stay warm while navigating the damp chill.

January Average Humidity in Keystone

This chart illustrates the average monthly humidity levels in Keystone, 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 Keystone is approximately 81%, 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 Keystone

In Keystone 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 Keystone, you can check the information here.

Maximum UV Index Levels in Keystone for January

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

Data source: Keystone 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 Keystone Compares to Other Months

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

This table compares monthly weather conditions in Keystone, 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 (21°F)	45 mm (1.8 inches)	81%	moderate
February Weather	-5°C (23°F)	52 mm (2.1 inches)	81%	moderate
March Weather	3°C (38°F)	73 mm (2.9 inches)	81%	high
April Weather	9°C (48°F)	85 mm (3.3 inches)	82%	very high
May Weather	16°C (62°F)	162 mm (6.4 inches)	78%	very high
June Weather	23°C (73°F)	143 mm (5.6 inches)	81%	extreme
July Weather	24°C (76°F)	91 mm (3.6 inches)	79%	very high
August Weather	22°C (72°F)	64 mm (2.5 inches)	77%	very high
September Weather	20°C (67°F)	121 mm (4.8 inches)	78%	very high
October Weather	11°C (52°F)	143 mm (5.6 inches)	78%	high
November Weather	3°C (38°F)	45 mm (1.8 inches)	87%	moderate
December Weather	-1°C (30°F)	40 mm (1.6 inches)	84%	moderate