Trenton weather by month
Measured at Trenton/Mercer Arpt
Averages and records for each calendar month at Trenton/Mercer Arpt, United States, from 1945 to 2026. The warmest month is July, averaging 30.3°C; the coolest is January at 4.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 4.2°C | −4.3°C | 22.2°C6 January 2007 | −18.8°C7 January 2018 | 28 / 28 |
| February | 6.1°C | −3.3°C | 25.6°C21 February 2018 | −17.7°C20 February 2015 | 28 / 29 |
| March | 11.4°C | 0.8°C | 30.6°C29 March 1945 | −14.3°C6 March 2015 | 29 / 30 |
| April | 17.4°C | 5.9°C | 33.9°C17 April 2002 | −5.6°C1 April 2003 | 30 / 30 |
| May | 22.5°C | 11.1°C | 35.6°C19 May 2026 | −0.5°C10 May 2020 | 30 / 30 |
| June | 27.4°C | 16.3°C | 36.7°C30 June 1945 | 6.1°C1 June 1945 | 30 / 30 |
| July | 30.3°C | 19.5°C | 41.1°C22 July 2011 | 10.0°C12 July 1945 | 30 / 30 |
| August | 29.0°C | 18.5°C | 37.8°C2 August 2002 | 9.4°C21 August 2000 | 30 / 30 |
| September | 25.4°C | 14.6°C | 36.1°C1 September 2010 | 2.2°C30 September 2000 | 29 / 30 |
| October | 18.9°C | 8.2°C | 33.9°C2 October 2019 | −2.7°C19 October 2015 | 28 / 28 |
| November | 12.9°C | 2.5°C | 26.7°C3 November 2003 | −10.5°C23 November 2018 | 28 / 28 |
| December | 7.1°C | −1.5°C | 24.4°C7 December 1998 | −14.9°C24 December 2022 | 28 / 28 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 28 to 30 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.