Trenton weather in December: Trenton, New Jersey: normal highs, lows, rain and records for December
Trenton in December has a normal high of 44°F and a normal low of 29°F, a daily mean of 37°F, falling from 49°F on the 1st to 41°F by the 31st. Measurable precipitation falls on 11 days in a normal December, 4.04 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 7°C and low of −1°C, 103 mm of precipitation and 12 cm of snow in December.
- NOAA stationTrenton-Mercer Airport
- Station IDUSW00014792
- Location40.28°N 74.82°W
- Elevation184 ft (56 m)
- From the center5 miles
- Population91,193
- Jan 40° 24°
- Feb 43° 26°
- Mar 51° 33°
- Apr 63° 42°
- May 72° 52°
- Jun 81° 61°
- Jul 86° 67°
- Aug 84° 65°
- Sep 77° 58°
- Oct 66° 46°
- Nov 55° 36°
- Dec 44° 29°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Trenton in December?
The normal high is 44°F and the normal low 29°F, for a daily mean of 36.8°F. December is 8.6°F cooler than November and 4.8°F warmer than January. December is the 10th warmest month of the year in Trenton and the 5th wettest. Across the month the normal high falls 8°F, from 49°F on December 1 to 41°F on December 31. From one year to the next December's mean temperature typically moves about 4.0°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 | 49°F | 33°F | 33% | 22% |
| December 8 | 47°F | 31°F | 35% | 23% |
| December 15 | 44°F | 30°F | 35% | 23% |
| December 22 | 43°F | 28°F | 35% | 23% |
| December 31 | 41°F | 26°F | 34% | 22% |
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 | 49°F | 33°F | 33% | 22% | 9 h 30 min |
| December 2 | 49°F | 33°F | 34% | 22% | 9 h 30 min |
| December 3 | 48°F | 32°F | 34% | 22% | 9 h 30 min |
| December 4 | 48°F | 32°F | 34% | 23% | 9 h 30 min |
| December 5 | 48°F | 32°F | 34% | 23% | 9 h 30 min |
| December 6 | 47°F | 32°F | 35% | 23% | 9 h 30 min |
| December 7 | 47°F | 31°F | 35% | 23% | 9 h 30 min |
| December 8 | 47°F | 31°F | 35% | 23% | 9 h 20 min |
| December 9 | 46°F | 31°F | 35% | 23% | 9 h 20 min |
| December 10 | 46°F | 31°F | 35% | 23% | 9 h 20 min |
| December 11 | 46°F | 30°F | 35% | 23% | 9 h 20 min |
| December 12 | 45°F | 30°F | 35% | 23% | 9 h 20 min |
| December 13 | 45°F | 30°F | 35% | 23% | 9 h 20 min |
| December 14 | 45°F | 30°F | 35% | 23% | 9 h 20 min |
| December 15 | 44°F | 30°F | 35% | 23% | 9 h 20 min |
| December 16 | 44°F | 29°F | 35% | 23% | 9 h 20 min |
| December 17 | 44°F | 29°F | 35% | 23% | 9 h 20 min |
| December 18 | 44°F | 29°F | 35% | 23% | 9 h 20 min |
| December 19 | 43°F | 29°F | 35% | 23% | 9 h 20 min |
| December 20 | 43°F | 28°F | 35% | 23% | 9 h 20 min |
| December 21 | 43°F | 28°F | 35% | 23% | 9 h 20 min |
| December 22 | 43°F | 28°F | 35% | 23% | 9 h 20 min |
| December 23 | 42°F | 28°F | 35% | 23% | 9 h 20 min |
| December 24 | 42°F | 28°F | 35% | 23% | 9 h 20 min |
| December 25 | 42°F | 27°F | 35% | 23% | 9 h 20 min |
| December 26 | 42°F | 27°F | 35% | 22% | 9 h 20 min |
| December 27 | 42°F | 27°F | 35% | 22% | 9 h 20 min |
| December 28 | 41°F | 27°F | 35% | 22% | 9 h 20 min |
| December 29 | 41°F | 26°F | 35% | 22% | 9 h 20 min |
| December 30 | 41°F | 26°F | 35% | 22% | 9 h 20 min |
| December 31 | 41°F | 26°F | 34% | 22% | 9 h 20 min |
- Normal high
- 44°FDecember average
- Normal low
- 29°FDecember average
- Precipitation
- 4.04 inmonth total
- Days with precipitation
- 110.01 inch or more
- Snowfall
- 4.6 inmonth total
- Nights at 32°F or colder
- 22
- Daylight
- 9 h 30 min to 9 h 20 minDecember 1 to December 31
- Sunshine
- 66%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014792; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Trenton in December?
On a given December day the chance of 0.01 inch or more is 35% on average, highest around December 13 (35%). In all, 4.04 in falls on 11 days of a normal December, 1 of them with an inch or more.
In a normal December in Trenton, 22 nights fall to freezing, 3 days stay below freezing all day and snowfall averages 4.6 inches.
Snow falls on 2 days in a normal December.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014792.
What are the records for December in Trenton?
The warmest December temperature on Trenton's official record (since 1865) is 76°F, on December 7, 1998; the coldest is −7°F, on December 30, 1917. The wettest December brought 9.49 in (1996); the snowiest, 21.5 inches (1960).
The December mean against the 1991-2020 normal of 36.8°F: 2021 41.5°F (+4.7), 2022 34.9°F (−1.9), 2023 40.8°F (+4.0), 2024 35.0°F (−1.8), 2025 31.0°F (−5.8). 2 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 41.5°F | +4.7°F | 1.24 in |
| 2022 | 34.9°F | −1.9°F | 3.89 in |
| 2023 | 40.8°F | +4.0°F | 7.53 in |
| 2024 | 35.0°F | −1.8°F | 3.91 in |
| 2025 | 31.0°F | −5.8°F | 3.38 in |
Source: records: ACIS, NWS threaded record TTNthr; recent months: ACIS, station USW00014792. Records and recent months use complete months only.
How does December in Trenton 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; Trenton's is 44°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.