New Jersey weather in December: Statewide normals and every place, NOAA 1991-2020
In December, New Jersey's statewide normal high is 45°F and normal low 28°F; normal highs run from 41°F in Sussex to 51°F in Belleplain (NOAA 1991-2020 normals).
- Statewide normal high
- 45°FDecember, 1991-2020
- Statewide normal low
- 28°FDecember, 1991-2020
- Statewide normal precipitation
- 4.27 inDecember
- Warmest place
- 51°Fnormal high, Belleplain
- Coolest place
- 41°Fnormal high, Sussex
Where is New Jersey warmest and wettest in December?
Belleplain has the warmest December afternoons (51°F) and Sussex the coolest (41°F). Toms River gets the most precipitation (5.81 in) and Sussex the least (3.10 in). The most snow falls in Harrison (5.9 inches).
Statewide, December averaged 41.2°F in 2021, 35.5°F in 2022, 41.5°F in 2023, 35.0°F in 2024, 31.9°F in 2025, against a 1991-2020 normal of 36.6°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Newark | 45°F | 31°F | 4.14 | 5.4 |
| Toms River | 47°F | 27°F | 5.81 | – |
| Trenton | 44°F | 29°F | 4.04 | 4.6 |
| New Brunswick | 45°F | 28°F | 4.49 | 4.9 |
| Plainfield | 46°F | 29°F | 4.19 | 2.4 |
| Atlantic City | 48°F | 29°F | 4.47 | 3.2 |
| Long Branch | 47°F | 30°F | 4.78 | – |
| Millville | 47°F | 28°F | 3.95 | – |
| Glassboro | 46°F | 30°F | – | – |
| Harrison | 44°F | 31°F | 4.58 | 5.9 |
| Phillipsburg | 43°F | 26°F | 4.37 | – |
| Hammonton | 47°F | 29°F | 4.56 | 3.7 |
| Moorestown-Lenola | 47°F | 31°F | 4.55 | – |
| Somerville | 44°F | 26°F | 3.87 | – |
| Freehold | 47°F | 28°F | 4.68 | – |
| Wanaque | 43°F | 27°F | 4.05 | – |
| Caldwell | 43°F | 28°F | 4.04 | – |
| Boonton | 42°F | 26°F | 4.36 | – |
| Newton | 41°F | 24°F | – | – |
| Hightstown | 46°F | 27°F | 4.23 | 4.4 |
| Flemington | 43°F | 26°F | 4.66 | 4.5 |
| Lambertville | 46°F | 25°F | 4.61 | 2.2 |
| Woodstown | 48°F | 30°F | 4.39 | 1.6 |
| Cape May | 48°F | 33°F | 4.02 | 2.0 |
| Belvidere | 41°F | 24°F | 4.08 | 4.0 |
| Essex Fells | 43°F | 27°F | 3.41 | – |
| Sussex | 41°F | 24°F | 3.10 | – |
| Cranford | 45°F | 31°F | 4.48 | 5.7 |
| Estell Manor | 48°F | 28°F | 4.74 | 3.6 |
| Seabrook Farms | 46°F | 30°F | 4.40 | 2.2 |
| Belleplain | 51°F | 28°F | – | – |
| Andover | 41°F | 25°F | 4.18 | – |
| Teterboro | 45°F | 31°F | 4.10 | – |
| Brant Beach-Beach Haven | 46°F | 33°F | 3.90 | 0.9 |
| Canoe Brook | 44°F | 28°F | 4.43 | 4.1 |
| Charlotteburg Reservoir | 41°F | 25°F | 4.81 | – |
| Indian Mills (2 mi W) | 47°F | 28°F | 4.58 | 3.9 |
| Little Falls | 44°F | 27°F | – | – |
| Margate | 48°F | 35°F | – | – |
| Mount Holly S Jersey Airport | 46°F | 29°F | 3.74 | – |
| Pennsauken (1 mi N) | 45°F | 30°F | 4.49 | – |
| Philadelphia/Mount Holly Weather Office | 44°F | 28°F | 4.31 | 3.8 |
| Wertsville (4 mi NE) | 43°F | 28°F | 4.62 | 4.6 |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.