ST HELENS AERODROME climate by month
Averages and records for each calendar month at ST HELENS AERODROME, Australia, from 2001 to 2026. The warmest month is January, averaging 22.9°C; the coolest is July at 13.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 22.9°C | 13.5°C | 41.8°C30 January 2009 | 4.8°C18 January 2004 | 25 / 26 |
| February | 22.2°C | 13.4°C | 35.6°C9 February 2014 | 6.3°C7 February 2006 | 25 / 26 |
| March | 21.2°C | 12.0°C | 34.4°C16 March 2008 | 3.1°C24 March 2012 | 25 / 26 |
| April | 18.7°C | 9.7°C | 28.4°C1 April 2014 | 1.3°C30 April 2009 | 25 / 26 |
| May | 16.2°C | 7.3°C | 24.9°C1 May 2026 | 0.0°C23 May 2001 | 26 / 26 |
| June | 14.1°C | 5.6°C | 19.2°C4 June 2013 | −1.0°C22 June 2007 | 26 / 26 |
| July | 13.7°C | 5.0°C | 19.3°C2 July 2023 | −0.9°C3 July 2015 | 26 / 26 |
| August | 14.5°C | 5.4°C | 23.1°C30 August 2026 | −1.0°C16 August 2004 | 26 / 26 |
| September | 16.1°C | 6.7°C | 25.2°C22 September 2021 | −0.3°C17 September 2019 | 25 / 26 |
| October | 17.6°C | 8.2°C | 29.7°C31 October 2009 | 0.9°C9 October 2003 | 25 / 25 |
| November | 19.5°C | 10.3°C | 33.8°C21 November 2019 | 1.9°C15 November 2006 | 25 / 25 |
| December | 21.3°C | 11.8°C | 36.8°C30 December 2019 | 4.3°C4 December 2008 | 25 / 25 |
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 25 to 26 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.