New Brunswick weather in December: New Brunswick, New Jersey: normal highs, lows, rain and records for December
New Brunswick in December has a normal high of 45°F and a normal low of 28°F, a daily mean of 37°F, falling from 50°F on the 1st to 42°F by the 31st. Measurable precipitation falls on 10 days in a normal December, 4.49 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 7°C and low of −2°C, 114 mm of precipitation and 12 cm of snow in December.
- NOAA stationNew Brunswick (3 mi SE)
- Station IDUSC00286055
- Location40.47°N 74.42°W
- Elevation111 ft (34 m)
- From the center1 miles
- Population57,487
- Jan 40° 23°
- Feb 43° 24°
- Mar 51° 31°
- Apr 63° 41°
- May 72° 51°
- Jun 81° 60°
- Jul 87° 66°
- Aug 85° 64°
- Sep 78° 57°
- Oct 67° 44°
- Nov 56° 35°
- Dec 45° 28°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is New Brunswick in December?
The normal high is 45°F and the normal low 28°F, for a daily mean of 36.9°F. December is 8.5°F cooler than November and 5.3°F warmer than January. December is the 10th warmest month of the year in New Brunswick and the 4th wettest. Across the month the normal high falls 8°F, from 50°F on December 1 to 42°F on December 31. From one year to the next December's mean temperature typically moves about 3.9°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 33°F and 41°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 35%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 50°F | 32°F | 32% | 23% |
| December 8 | 48°F | 30°F | 33% | 23% |
| December 15 | 45°F | 29°F | 33% | 24% |
| December 22 | 44°F | 27°F | 34% | 23% |
| December 31 | 42°F | 25°F | 35% | 23% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 50°F | 32°F | 32% | 23% | 9 h 30 min |
| December 2 | 50°F | 32°F | 32% | 23% | 9 h 30 min |
| December 3 | 49°F | 31°F | 32% | 23% | 9 h 30 min |
| December 4 | 49°F | 31°F | 32% | 23% | 9 h 30 min |
| December 5 | 49°F | 31°F | 32% | 23% | 9 h 30 min |
| December 6 | 48°F | 31°F | 33% | 23% | 9 h 30 min |
| December 7 | 48°F | 30°F | 33% | 23% | 9 h 20 min |
| December 8 | 48°F | 30°F | 33% | 23% | 9 h 20 min |
| December 9 | 47°F | 30°F | 33% | 24% | 9 h 20 min |
| December 10 | 47°F | 30°F | 33% | 24% | 9 h 20 min |
| December 11 | 47°F | 30°F | 33% | 24% | 9 h 20 min |
| December 12 | 46°F | 29°F | 33% | 24% | 9 h 20 min |
| December 13 | 46°F | 29°F | 33% | 24% | 9 h 20 min |
| December 14 | 46°F | 29°F | 33% | 24% | 9 h 20 min |
| December 15 | 45°F | 29°F | 33% | 24% | 9 h 20 min |
| December 16 | 45°F | 28°F | 33% | 24% | 9 h 20 min |
| December 17 | 45°F | 28°F | 33% | 24% | 9 h 20 min |
| December 18 | 45°F | 28°F | 34% | 24% | 9 h 20 min |
| December 19 | 44°F | 28°F | 34% | 24% | 9 h 20 min |
| December 20 | 44°F | 28°F | 34% | 23% | 9 h 20 min |
| December 21 | 44°F | 27°F | 34% | 23% | 9 h 20 min |
| December 22 | 44°F | 27°F | 34% | 23% | 9 h 20 min |
| December 23 | 43°F | 27°F | 34% | 23% | 9 h 20 min |
| December 24 | 43°F | 27°F | 34% | 23% | 9 h 20 min |
| December 25 | 43°F | 26°F | 34% | 23% | 9 h 20 min |
| December 26 | 43°F | 26°F | 34% | 23% | 9 h 20 min |
| December 27 | 43°F | 26°F | 34% | 23% | 9 h 20 min |
| December 28 | 42°F | 26°F | 34% | 23% | 9 h 20 min |
| December 29 | 42°F | 26°F | 34% | 23% | 9 h 20 min |
| December 30 | 42°F | 25°F | 35% | 23% | 9 h 20 min |
| December 31 | 42°F | 25°F | 35% | 23% | 9 h 20 min |
- Normal high
- 45°FDecember average
- Normal low
- 28°FDecember average
- Precipitation
- 4.49 inmonth total
- Days with precipitation
- 100.01 inch or more
- Snowfall
- 4.9 inmonth total
- Nights at 32°F or colder
- 22
- Daylight
- 9 h 30 min to 9 h 20 minDecember 1 to December 31
- Days at 70°F or more
- 1
- Sunshine
- 66%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00286055; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in New Brunswick in December?
On a given December day the chance of 0.01 inch or more is 33% on average, highest around December 31 (35%). In all, 4.49 in falls on 10 days of a normal December, 1 of them with an inch or more.
In a normal December in New Brunswick, 22 nights fall to freezing, 3 days stay below freezing all day and snowfall averages 4.9 inches.
Snow falls on 2 days in a normal December, and an inch or more covers the ground on 4 days.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00286055.
What are the records for December in New Brunswick?
The warmest December temperature on New Brunswick's official record (since 1893) is 76°F, on December 8, 1998; the coldest is −15°F, on December 30, 1917. The wettest December brought 9.91 in (1983); the snowiest, 23.1 inches (1948).
The December mean against the 1991-2020 normal of 36.9°F: 2021 41.6°F (+4.7), 2022 36.2°F (−0.7), 2023 41.8°F (+4.9), 2024 35.5°F (−1.4), 2025 32.0°F (−4.9). 2 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 41.6°F | +4.7°F | 1.45 in |
| 2022 | 36.2°F | −0.7°F | 4.43 in |
| 2023 | 41.8°F | +4.9°F | 8.78 in |
| 2024 | 35.5°F | −1.4°F | 4.10 in |
| 2025 | 32.0°F | −4.9°F | 3.63 in |
Source: records: ACIS, NWS threaded record NBRN4thr; recent months: ACIS, station USC00286055. Records and recent months use complete months only.
How does December in New Brunswick compare across New Jersey?
Across the 33 places PlainClimate covers in New Jersey, December normal highs run from 41°F in Sussex to 51°F in Belleplain; New Brunswick's is 45°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- New Brunswick in November56°F by day, 35°F at night
- New Brunswick in January40°F by day, 23°F at night
- New Brunswick through the yearEvery month, frost dates, records and recent years
- New Jersey in DecemberThe statewide normal and the warmest and coolest places
- Belleplain: New Jersey's warmest Decembernormal high 51°F