Trenton weather in January: Trenton, New Jersey: normal highs, lows, rain and records for January
Trenton in January has a normal high of 40°F and a normal low of 24°F, a daily mean of 32°F, holding near 40°F all month. Measurable precipitation falls on 10 days in a normal January, 3.29 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 4°C and low of −4°C, 84 mm of precipitation and 21 cm of snow in January.
- 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 January?
The normal high is 40°F and the normal low 24°F, for a daily mean of 32.0°F. January is 4.8°F cooler than December and 2.3°F cooler than February. January is the 12th warmest month of the year in Trenton and the 10th wettest. Across the month the normal high falls 1°F, from 41°F on January 1 to 40°F on January 31. From one year to the next January's mean temperature typically moves about 4.3°F either way (NOAA's standard deviation), so roughly two Januarys in three average between 28°F and 36°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 34%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| January 1 | 41°F | 26°F | 34% | 22% |
| January 8 | 40°F | 25°F | 34% | 21% |
| January 15 | 39°F | 24°F | 34% | 20% |
| January 22 | 39°F | 24°F | 34% | 19% |
| January 31 | 40°F | 24°F | 34% | 19% |
Every day of January: normal high, low and chance of precipitation (warmest afternoon January 1, coldest night January 21)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| January 1 | 41°F | 26°F | 34% | 22% | 9 h 20 min |
| January 2 | 40°F | 26°F | 34% | 22% | 9 h 20 min |
| January 3 | 40°F | 26°F | 34% | 22% | 9 h 20 min |
| January 4 | 40°F | 25°F | 34% | 21% | 9 h 20 min |
| January 5 | 40°F | 25°F | 34% | 21% | 9 h 20 min |
| January 6 | 40°F | 25°F | 34% | 21% | 9 h 20 min |
| January 7 | 40°F | 25°F | 34% | 21% | 9 h 30 min |
| January 8 | 40°F | 25°F | 34% | 21% | 9 h 30 min |
| January 9 | 40°F | 25°F | 34% | 21% | 9 h 30 min |
| January 10 | 40°F | 25°F | 34% | 21% | 9 h 30 min |
| January 11 | 40°F | 24°F | 34% | 21% | 9 h 30 min |
| January 12 | 39°F | 24°F | 34% | 20% | 9 h 30 min |
| January 13 | 39°F | 24°F | 34% | 20% | 9 h 30 min |
| January 14 | 39°F | 24°F | 34% | 20% | 9 h 30 min |
| January 15 | 39°F | 24°F | 34% | 20% | 9 h 40 min |
| January 16 | 39°F | 24°F | 34% | 20% | 9 h 40 min |
| January 17 | 39°F | 24°F | 34% | 20% | 9 h 40 min |
| January 18 | 39°F | 24°F | 34% | 20% | 9 h 40 min |
| January 19 | 39°F | 24°F | 34% | 20% | 9 h 40 min |
| January 20 | 39°F | 24°F | 34% | 20% | 9 h 40 min |
| January 21 | 39°F | 24°F | 34% | 19% | 9 h 50 min |
| January 22 | 39°F | 24°F | 34% | 19% | 9 h 50 min |
| January 23 | 40°F | 24°F | 34% | 19% | 9 h 50 min |
| January 24 | 40°F | 24°F | 34% | 19% | 9 h 50 min |
| January 25 | 40°F | 24°F | 34% | 19% | 9 h 50 min |
| January 26 | 40°F | 24°F | 34% | 19% | 9 h 50 min |
| January 27 | 40°F | 24°F | 34% | 19% | 10 h |
| January 28 | 40°F | 24°F | 34% | 19% | 10 h |
| January 29 | 40°F | 24°F | 34% | 19% | 10 h |
| January 30 | 40°F | 24°F | 34% | 19% | 10 h |
| January 31 | 40°F | 24°F | 34% | 19% | 10 h |
- Normal high
- 40°FJanuary average
- Normal low
- 24°FJanuary average
- Precipitation
- 3.29 inmonth total
- Days with precipitation
- 100.01 inch or more
- Snowfall
- 8.2 inmonth total
- Nights at 32°F or colder
- 25
- Daylight
- 9 h 20 min to 10 hJanuary 1 to January 31
- Sunshine
- 68%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 January?
On a given January day the chance of 0.01 inch or more is 34% on average, highest around January 1 (34%). In all, 3.29 in falls on 10 days of a normal January, 1 of them with an inch or more.
In a normal January in Trenton, 25 nights fall to freezing, 8 days stay below freezing all day and snowfall averages 8.2 inches.
Snow falls on 5 days in a normal January.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014792.
What are the records for January in Trenton?
The warmest January temperature on Trenton's official record (since 1865) is 73°F, on January 14, 1932; the coldest is −16°F, on January 22, 1984. The wettest January brought 8.99 in (1979); the snowiest, 33.0 inches (2011).
The January mean against the 1991-2020 normal of 32.0°F: 2021 33.2°F (+1.2), 2022 27.9°F (−4.1), 2023 40.5°F (+8.5), 2024 34.0°F (+2.0), 2025 27.9°F (−4.1), 2026 27.3°F (−4.7). 3 of 6 ran warmer than normal.
| January | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 33.2°F | +1.2°F | 1.63 in |
| 2022 | 27.9°F | −4.1°F | 3.38 in |
| 2023 | 40.5°F | +8.5°F | 3.60 in |
| 2024 | 34.0°F | +2.0°F | 5.87 in |
| 2025 | 27.9°F | −4.1°F | 0.83 in |
| 2026 | 27.3°F | −4.7°F | 2.59 in |
Source: records: ACIS, NWS threaded record TTNthr; recent months: ACIS, station USW00014792. Records and recent months use complete months only.
How does January in Trenton compare across New Jersey?
Across the 33 places PlainClimate covers in New Jersey, January normal highs run from 36°F in Andover to 46°F in Belleplain; Trenton's is 40°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.