December in Brookhaven averages a daily high of 13°C with nights around 2.5°C. Expect roughly 11.1 wet days totalling 116.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Brookhaven is September–November.
Based on ATLANTA DEKALB PEACHTREE AIRPORT, GA US (4.5km), 1995–2024. 27 years of December data.