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December Weather in Brookhaven, United States

Last updated: June 24, 2025

In Brookhaven, United States, the average temperature for December hovers around 12°C (53°F). During this time, expect a range that can dip to a chilly -8°C (19°F) or rise to a warm 28°C (82°F). Over the month, 139 mm (5.5 in) of precipitation falls, typically over 12 days, contributing to an average humidity of 88%. Plan accordingly for a potentially damp yet mild experience!

December Temperature in Brookhaven

In December in Brookhaven, the average temperature is 12°C (53°F), with maximums reaching 28°C (82°F) and minimums dropping as low as -8°C (19°F). Be prepared for a wide range of temperatures to ensure a comfortable and enjoyable visit.

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

The chart illustrates December 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, December typically has an average temperature of 12°C (53°F), with highs reaching up to 28°C (82°F) and lows dropping to around -8°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec505562657479818078705653
Data source: Temperature data for Brookhaven generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Brookhaven

In Brookhaven, in December, the precipitation amount is 139 mm (5.5 in) over a span of 12 days.

December Precipitation Trends in Brookhaven

The chart displays monthly precipitation patterns in Brookhaven, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Brookhaven, December typically receives around 139 mm (5.5 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec12012912016317514913116911010485139
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Brookhaven

In Brookhaven in December humidity is 88%. With an average temperature of 12°C (53°F), this humidity feels like a damp chill that clings to your skin, making it crucial to dress in layers and stay prepared for the discomfort while exploring.

December Average Humidity in Brookhaven

This chart illustrates the average monthly humidity levels in Brookhaven, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Brookhaven is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%83%80%81%81%78%79%79%79%77%85%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Brookhaven

In Brookhaven in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Brookhaven for better planning.

Maximum UV Index Levels in Brookhaven for December

The chart shows the monthly maximum UV Index (UVI) for Brookhaven in December, 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 December, the maximum UV index in Brookhaven typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111112121110864
Data source: Brookhaven December 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 December 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 December’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 December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)120 mm (4.7 inches)83%moderate
February Weather13°C (55°F)129 mm (5.1 inches)83%very high
March Weather16°C (62°F)120 mm (4.7 inches)80%very high
April Weather18°C (65°F)163 mm (6.4 inches)81%extreme
May Weather23°C (74°F)175 mm (6.9 inches)81%extreme
June Weather26°C (79°F)149 mm (5.8 inches)78%extreme
July Weather27°C (81°F)131 mm (5.1 inches)79%extreme
August Weather27°C (80°F)169 mm (6.6 inches)79%extreme
September Weather26°C (78°F)110 mm (4.3 inches)79%very high
October Weather21°C (70°F)104 mm (4.1 inches)77%very high
November Weather14°C (57°F)85 mm (3.4 inches)85%high
December Weather12°C (53°F)139 mm (5.5 inches)88%moderate

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