January Weather in Brookhaven, United States

Last updated: June 24, 2025

In January, the average temperature in Brookhaven, United States hovers around 10°C (50°F). Expect extremes, with lows plummeting to -13°C (10°F) and highs reaching up to 27°C (82°F). During this month, there's a notable precipitation of 120 mm (4.7 in) spread over about 8 days, contributing to an average humidity level of 83%.

January Temperature in Brookhaven

In January in Brookhaven, the average temperature is 10°C (50°F), with maximums reaching 27°C (82°F) and minimums dipping as low as -13°C (10°F). Be prepared for a wide range of temperatures when traveling during this month!

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

The chart illustrates January temperature patterns in Brookhaven, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brookhaven, January typically has an average temperature of 10°C (50°F), with highs reaching up to 27°C (82°F) and lows dropping to around -13°C (10°F).

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

January Precipitation in Brookhaven

In Brookhaven in January, the total precipitation amount reaches 120 mm (4.7 in) over the course of 8 days.

January Precipitation Trends in Brookhaven

The chart displays monthly precipitation patterns in Brookhaven, 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 Brookhaven, January typically receives around 120 mm (4.7 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Brookhaven

In Brookhaven in January, humidity is 83%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill that clings to your skin, making outdoor exploration less comfortable and prompting visitors to seek cozy indoor activities.

January Average Humidity in Brookhaven

This chart illustrates the average monthly humidity levels in Brookhaven, 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 Brookhaven is approximately 83%, 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 Brookhaven

In Brookhaven in January, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Brookhaven.

Maximum UV Index Levels in Brookhaven for January

The chart shows the monthly maximum UV Index (UVI) for Brookhaven 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 Brookhaven typically reaches 5, which falls under the moderate exposure category.

Data source: Brookhaven 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 Brookhaven Compares to Other Months

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

This table compares monthly weather conditions in Brookhaven, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	120 mm (4.7 inches)	83%	moderate
February Weather	13°C (55°F)	129 mm (5.1 inches)	83%	very high
March Weather	16°C (62°F)	120 mm (4.7 inches)	80%	very high
April Weather	18°C (65°F)	163 mm (6.4 inches)	81%	extreme
May Weather	23°C (74°F)	175 mm (6.9 inches)	81%	extreme
June Weather	26°C (79°F)	149 mm (5.8 inches)	78%	extreme
July Weather	27°C (81°F)	131 mm (5.1 inches)	79%	extreme
August Weather	27°C (80°F)	169 mm (6.6 inches)	79%	extreme
September Weather	26°C (78°F)	110 mm (4.3 inches)	79%	very high
October Weather	21°C (70°F)	104 mm (4.1 inches)	77%	very high
November Weather	14°C (57°F)	85 mm (3.4 inches)	85%	high
December Weather	12°C (53°F)	139 mm (5.5 inches)	88%	moderate