CASTERTON climate by month
Averages and records for each calendar month at CASTERTON, Australia, from 2005 to 2026. The warmest month is January, averaging 28.2°C; the coolest is July at 13.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 28.2°C | 12.4°C | 44.7°C27 January 2026 | 2.8°C10 January 2019 | 20 / 21 |
| February | 27.1°C | 12.3°C | 43.3°C2 February 2014 | 3.2°C24 February 2021 | 21 / 21 |
| March | 24.7°C | 11.1°C | 40.9°C17 March 2008 | 0.2°C26 March 2005 | 21 / 22 |
| April | 20.5°C | 8.9°C | 36.1°C1 April 2014 | 0.4°C20 April 2015 | 22 / 22 |
| May | 16.4°C | 7.1°C | 27.9°C1 May 2026 | −2.2°C24 May 2006 | 22 / 22 |
| June | 13.7°C | 5.1°C | 22.4°C8 June 2005 | −3.3°C24 June 2019 | 22 / 22 |
| July | 13.1°C | 4.9°C | 19.2°C25 July 2007 | −3.7°C20 July 2006 | 21 / 22 |
| August | 14.4°C | 5.4°C | 23.4°C30 August 2007 | −2.1°C17 August 2019 | 22 / 22 |
| September | 16.3°C | 6.2°C | 28.2°C2 September 2021 | −1.7°C9 September 2008 | 21 / 22 |
| October | 19.0°C | 7.1°C | 34.5°C12 October 2006 | −1.9°C9 October 2006 | 21 / 21 |
| November | 22.0°C | 9.0°C | 38.2°C30 November 2006 | −0.4°C17 November 2008 | 21 / 21 |
| December | 24.9°C | 10.1°C | 44.5°C20 December 2019 | 0.7°C7 December 2006 | 21 / 21 |
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 20 to 22 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.