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Weather · December
Brookhaven weather in December
Average highs of 45°F, lows of 29°F and 4.5 in of rain, from 30 years of weather records.
December is Brookhaven’s 10th warmest month, with average highs of 45°F and lows of 29°F. That is 9° cooler than November, and 16° below the yearly average high.
- Average high
- 45°F
- Average low
- 29°F
- Precipitation
- 4.5 in
- Wet days
- 12
- Sunrise · sunset
- 7:09 AM · 4:24 PM
December across the year
High and low Rain
What to wear in December
- Cold days: a winter coat, hat and gloves.
- Freezing nights: expect frost on cars in the morning.
- Pack an umbrella or rain jacket: rain or snow falls on about 12 days this month.
December is good for
What’s on in Brookhaven in December
- Charles Dickens FestivalDecember 5 – December 6 · Opening parade 11 a.m. Saturday; Puppet Parade 5 p.m. Sunday · Village of Port Jefferson
- Santa's Toy Trot 5KSunday, December 6 · 9:30 a.m. kids' run; 10:00 a.m. 5K · Shorefront Park, Patchogue
- Stony Brook Village Holiday Festival and Tree LightingSunday, December 6 · 12:00 p.m. - 6:00 p.m.; tree lighting after 5 p.m. · Stony Brook Village Center, Stony Brook
- Atlantic Wind Symphony Holiday ConcertSunday, December 20 · 3:00 p.m. · Patchogue Theatre for the Performing Arts
- New Year's Laughin' Eve at Theatre ThreeThursday, December 31 · 6:00, 8:00 and 10:00 p.m. · Theatre Three, Port Jefferson
See all upcoming events and school days off.
Around Brookhaven
See Brookhaven
A look around town before you go.
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Watch on YouTube ↗December compared with the months around it
Planning a trip? See the best time to visit Brookhaven and today’s forecast.
Questions
How hot does it get in Brookhaven in December?
Average highs are 45°F and average lows 29°F, for a daily mean of 37°F. Individual days run hotter or colder than these 30-year averages.
Does it rain in Brookhaven in December?
December averages 4.5 in of precipitation over about 12 days with at least 0.01 in. It is the 2nd wettest month of the year.
What time is sunset in Brookhaven in December?
Around mid-December the sun rises about 7:09 AM and sets about 4:24 PM, for roughly 9.3 hours of daylight.
Is December a good time to visit Brookhaven?
The mildest months for visiting are May, July, August. December is cold, with Christmas lights and New Year’s Eve events.
NOAA U.S. Climate Normals 1991–2020, Shirley Brookhaven Ap station (3.7 mi from downtown). Sunrise and sunset are calculated for December 15 at the city’s coordinates.