January Weather in Summit, United States

Last updated: June 24, 2025

In January, the average temperature in Summit, United States is a brisk 3°C (39°F), with fluctuations reaching as low as -16°C (4°F) and peaking at 22°C (72°F). Expect 75 mm (3.0 in) of precipitation spread over 8 days, contributing to a notably high average humidity of 81%. Prepare for both chilly weather and the possibility of rain!

January Temperature in Summit

In January in Summit, the average temperature is 3°C (39°F). The maximum can reach 22°C (72°F), and the minimum can be as low as -16°C (4°F). Travelers should be prepared for a wide range of temperatures, so it's essential to pack accordingly to enjoy all that Summit has to offer.

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 3°C (39°F), with highs reaching up to 22°C (72°F) and lows dropping to around -16°C (4°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 75 mm (3.0 in) over the course of 8 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 75 mm (3.0 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 Summit

In Summit in January, humidity is 81%. With an average temperature of 3°C (39°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and requiring extra layers to stay warm and dry during your travels.

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 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 Summit

In Summit 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 Summit, you can check the information here.

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 3, which falls under the moderate 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	3°C (39°F)	75 mm (3.0 inches)	81%	moderate
February Weather	5°C (41°F)	101 mm (4.0 inches)	78%	high
March Weather	11°C (52°F)	133 mm (5.2 inches)	76%	high
April Weather	14°C (58°F)	140 mm (5.5 inches)	78%	very high
May Weather	20°C (68°F)	170 mm (6.7 inches)	83%	very high
June Weather	25°C (77°F)	84 mm (3.3 inches)	83%	extreme
July Weather	27°C (81°F)	67 mm (2.6 inches)	78%	extreme
August Weather	26°C (78°F)	110 mm (4.3 inches)	68%	very high
September Weather	23°C (75°F)	56 mm (2.2 inches)	64%	very high
October Weather	16°C (62°F)	101 mm (4.0 inches)	70%	high
November Weather	9°C (49°F)	71 mm (2.8 inches)	83%	moderate
December Weather	7°C (44°F)	81 mm (3.2 inches)	87%	moderate