Mortlake Aws climate by month
Averages and records for each calendar month at Mortlake Aws, Australia, from 1990 to 2026. The warmest month is January, averaging 26.4°C; the coolest is July at 13.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 26.4°C | 11.2°C | 46.3°C27 January 2026 | 1.1°C3 January 2009 | 35 / 36 |
| February | 26.4°C | 11.5°C | 46.0°C7 February 2009 | 2.0°C19 February 1991 | 35 / 36 |
| March | 24.1°C | 10.0°C | 41.5°C26 March 2013 | −1.3°C27 March 1995 | 35 / 36 |
| April | 20.3°C | 8.2°C | 36.9°C1 April 2014 | −2.5°C27 April 1996 | 34 / 36 |
| May | 16.4°C | 6.6°C | 28.5°C1 May 2026 | −3.1°C22 May 2025 | 35 / 36 |
| June | 13.7°C | 5.0°C | 23.2°C8 June 2005 | −5.0°C14 June 1996 | 33 / 36 |
| July | 13.1°C | 4.6°C | 19.1°C8 July 1994 | −5.3°C23 July 1994 | 37 / 37 |
| August | 14.1°C | 4.9°C | 23.4°C20 August 1995 | −4.4°C4 August 1997 | 37 / 37 |
| September | 15.9°C | 5.7°C | 28.4°C30 September 2023 | −3.0°C26 September 2018 | 36 / 37 |
| October | 18.3°C | 6.5°C | 35.8°C12 October 2006 | −3.9°C16 October 2006 | 35 / 36 |
| November | 20.9°C | 8.1°C | 38.3°C21 November 2006 | −1.4°C16 November 1994 | 36 / 36 |
| December | 23.7°C | 9.3°C | 44.0°C20 December 2019 | −0.6°C1 December 1994 | 35 / 36 |
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 33 to 37 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.