January Weather in Port Jefferson Station, United States

Last updated: June 24, 2025

In January, the average temperature in Port Jefferson Station, United States hovers around 2°C (35°F). During this time, you might experience a chilly minimum of -15°C (6°F) and the occasional warm spell reaching up to 15°C (60°F). Expect about 80 mm (3.1 in) of precipitation spread over 8 days, contributing to a relatively high average humidity of 84%. Prepare accordingly!

January Temperature in Port Jefferson Station

In January in Port Jefferson Station, the average temperature is 2°C (35°F). The maximum can reach 15°C (60°F) and the minimum can be as low as -15°C (6°F). Be prepared for a wide range of temperatures if you plan to travel during this month.

January Weather in Port Jefferson Station: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Port Jefferson Station, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Port Jefferson Station, January typically has an average temperature of 2°C (35°F), with highs reaching up to 15°C (60°F) and lows dropping to around -15°C (6°F).

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

January Precipitation in Port Jefferson Station

In Port Jefferson Station in January, the precipitation amount is 80 mm (3.1 in) over a period of 8 days.

January Precipitation Trends in Port Jefferson Station

The chart displays monthly precipitation patterns in Port Jefferson Station, 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 Port Jefferson Station, January typically receives around 80 mm (3.1 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 Port Jefferson Station

In Port Jefferson Station in January, humidity is 84%. With an average temperature of 2°C (35°F), this humidity feels like an uncomfortable chill that penetrates your bones, making outdoor travel quite brisk and uninviting.

January Average Humidity in Port Jefferson Station

This chart illustrates the average monthly humidity levels in Port Jefferson Station, 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 Port Jefferson Station is approximately 84%, 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 Port Jefferson Station

In Port Jefferson Station 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 Port Jefferson Station, you can check the information here.

Maximum UV Index Levels in Port Jefferson Station for January

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

Data source: Port Jefferson Station 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 Port Jefferson Station Compares to Other Months

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

This table compares monthly weather conditions in Port Jefferson Station, 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 (35°F)	80 mm (3.1 inches)	84%	moderate
February Weather	2°C (36°F)	112 mm (4.4 inches)	82%	moderate
March Weather	4°C (40°F)	104 mm (4.1 inches)	81%	high
April Weather	9°C (49°F)	132 mm (5.2 inches)	78%	very high
May Weather	14°C (58°F)	119 mm (4.7 inches)	69%	very high
June Weather	20°C (68°F)	87 mm (3.4 inches)	69%	very high
July Weather	24°C (76°F)	131 mm (5.2 inches)	62%	very high
August Weather	24°C (75°F)	103 mm (4.0 inches)	65%	very high
September Weather	21°C (70°F)	94 mm (3.7 inches)	68%	very high
October Weather	16°C (61°F)	143 mm (5.6 inches)	74%	high
November Weather	9°C (49°F)	103 mm (4.0 inches)	82%	moderate
December Weather	5°C (40°F)	140 mm (5.5 inches)	80%	low