Williamtown/New Castle Arpt climate by month
Averages and records for each calendar month at Williamtown/New Castle Arpt, Australia, from 1942 to 2026. The warmest month is January, averaging 28.3°C; the coolest is July at 17.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 28.3°C | 18.2°C | 45.5°C4 January 2020 | 9.4°C8 January 1965 | 76 / 76 |
| February | 27.8°C | 18.2°C | 45.5°C11 February 2017 | 9.6°C18 February 1998 | 76 / 76 |
| March | 26.4°C | 16.5°C | 40.7°C9 March 1983 | 8.6°C2 March 2003 | 76 / 76 |
| April | 23.8°C | 13.3°C | 37.0°C5 April 1986 | 2.1°C23 April 2006 | 76 / 76 |
| May | 20.4°C | 10.2°C | 29.6°C13 May 1957 | −0.6°C30 May 1971 | 76 / 76 |
| June | 17.8°C | 8.0°C | 26.6°C5 June 1958 | −1.8°C30 June 2010 | 76 / 76 |
| July | 17.3°C | 6.5°C | 27.8°C24 July 1990 | −3.9°C18 July 1970 | 76 / 76 |
| August | 18.9°C | 7.0°C | 30.5°C23 August 2012 | −1.9°C31 August 1970 | 77 / 77 |
| September | 21.6°C | 9.2°C | 36.4°C26 September 2013 | 0.4°C13 September 1984 | 76 / 78 |
| October | 23.9°C | 12.1°C | 39.8°C22 October 2025 | 3.0°C18 October 1974 | 77 / 77 |
| November | 25.7°C | 14.5°C | 43.2°C25 November 1982 | 5.1°C22 November 1971 | 77 / 77 |
| December | 27.5°C | 16.7°C | 43.7°C20 December 2017 | 7.9°C2 December 1991 | 77 / 77 |
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 76 to 77 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.