January Weather in Summit, United States

Last updated: June 24, 2025

In January, the average temperature in Summit, United States hovers around 5°C (41°F), with fluctuating extremes ranging from a chilly -8°C (17°F) to a mild 14°C (57°F). Expect a significant amount of precipitation, totaling 187 mm (7.4 in) over approximately 17 days, while the air carries a damp average humidity of 86%. Stay prepared for the delightful yet unpredictable weather!

January Temperature in Summit

In January in Summit, the average temperature is 5°C (41°F). Maximum temperatures can reach 14°C (57°F), while minimums can dip as low as -8°C (17°F). Be prepared for chilly weather and dress in layers if you plan to visit during this time.

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

The chart illustrates January temperature patterns in Summit, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Summit, January typically has an average temperature of 5°C (41°F), with highs reaching up to 14°C (57°F) and lows dropping to around -8°C (17°F).

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

January Precipitation in Summit

In Summit in January, the total precipitation amount is 187 mm (7.4 in), occurring over the span of 17 days.

January Precipitation Trends in Summit

The chart displays monthly precipitation patterns in Summit, 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 Summit, January typically receives around 187 mm (7.4 inches) of precipitation spread over approximately 17 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 Summit

In Summit in January humidity is 86%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket wrapping around you, making outdoor activities uncomfortable and travel quite challenging due to the chill combined with the stickiness in the air.

January Average Humidity in Summit

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

In Summit 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 Summit, you can visit Hourly UV Index in Summit.

Maximum UV Index Levels in Summit for January

The chart shows the monthly maximum UV Index (UVI) for Summit 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 Summit typically reaches 2, which falls under the low exposure category.

Data source: Summit 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 Summit Compares to Other Months

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

This table compares monthly weather conditions in Summit, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	187 mm (7.4 inches)	86%	low
February Weather	4°C (40°F)	193 mm (7.6 inches)	86%	moderate
March Weather	6°C (44°F)	138 mm (5.4 inches)	87%	moderate
April Weather	9°C (48°F)	120 mm (4.7 inches)	84%	high
May Weather	13°C (55°F)	69 mm (2.7 inches)	81%	very high
June Weather	16°C (60°F)	64 mm (2.5 inches)	82%	very high
July Weather	18°C (65°F)	13 mm (0.5 inches)	79%	very high
August Weather	19°C (66°F)	16 mm (0.6 inches)	63%	very high
September Weather	16°C (61°F)	97 mm (3.8 inches)	62%	high
October Weather	10°C (51°F)	153 mm (6.0 inches)	83%	moderate
November Weather	7°C (46°F)	193 mm (7.6 inches)	89%	moderate
December Weather	5°C (41°F)	208 mm (8.2 inches)	88%	low