Mount Holly/S Jersey Rgnl climate by month
Averages and records for each calendar month at Mount Holly/S Jersey Rgnl, United States, from 1997 to 2026. The warmest month is July, averaging 30.7°C; the coolest is January at 5.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 5.3°C | −3.9°C | 22.2°C29 January 2002 | −19.3°C4 January 2014 | 28 / 29 |
| February | 6.8°C | −3.2°C | 25.0°C21 February 2018 | −18.8°C21 February 2015 | 28 / 29 |
| March | 11.9°C | 0.9°C | 31.1°C30 March 1998 | −16.6°C6 March 2015 | 28 / 29 |
| April | 18.1°C | 5.8°C | 35.0°C17 April 2002 | −5.5°C6 April 2016 | 28 / 29 |
| May | 23.1°C | 11.1°C | 35.6°C31 May 2022 | 1.1°C1 May 2000 | 29 / 29 |
| June | 28.0°C | 16.3°C | 37.8°C22 June 2024 | 5.6°C1 June 2020 | 27 / 29 |
| July | 30.7°C | 19.2°C | 40.0°C6 July 2010 | 6.1°C1 July 2011 | 27 / 29 |
| August | 29.5°C | 18.2°C | 37.8°C9 August 2001 | 6.7°C15 August 2013 | 26 / 29 |
| September | 25.9°C | 14.1°C | 36.7°C7 September 2023 | 2.8°C30 September 2000 | 27 / 29 |
| October | 19.4°C | 8.0°C | 34.4°C2 October 2019 | −2.7°C24 October 2008 | 28 / 28 |
| November | 13.5°C | 2.3°C | 27.2°C6 November 2024 | −10.5°C23 November 2018 | 28 / 28 |
| December | 7.8°C | −1.5°C | 23.3°C7 December 1998 | −14.9°C23 December 2024 | 29 / 29 |
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 26 to 29 years each.
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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.