Wednesday 18 June 2025 - Seasonal Climate Summary for Remote Islands and Antarctica - Product code IDCKGC2RR0
Remote Islands and Antarctica in autumn 2025
Jump to a map of the areas covered in this summary
Australia's Indian Ocean islands
- Autumn rainfall at Christmas Island Aero was wetter than average, the total rainfall was 1079.0 mm compared to the autumn average of 715.2 mm.
- At Christmas Island Aero, the mean maximum and mean minimum temperatures were 0.4 and 0.5 °C warmer than the autumn average, respectively.
- The autumn rainfall total at Cocos Island Airport was close to average, the total rainfall was 657.0 mm compared to the autumn average of 670.2 mm.
- Both the mean maximum and mean minimum temperatures were above average at Cocos Island Airport at 0.7 and 0.4 °C, respectively. Cocos Island Airport had its equal warmest autumn day (highest daily maximum temperature) on record at 32.8 °C on 7 March.
Australia's Pacific Ocean islands
- Autumn rainfall at Norfolk Island was above average, with a rainfall total of 508.0 mm, compared to the autumn average of 355.7 mm.
- At Norfolk Island Aero, both the mean maximum and mean minimum temperatures were 1.4 °C above average, the station also recorded its equal warmest autumn maximum temperature on record at 24.1 °C and equal warmest autumn mean temperature on record at 21.7 °C.
- Lord Howe Island Aero recorded a total autumn rainfall of 420.3 mm, this was close to the autumn average rainfall for the station at 422.3 mm.
- At Lord Howe Island Aero, the mean maximum temperature was 0.9 °C above average and the mean minimum temperature was 1.1 °C above average.
Australia's Antarctic and sub-Antarctic territories
- The strongest wind gust recorded during autumn was 161 km/h at Mawson on the morning of 27 April.
- The mean maximum and mean minimum temperatures for autumn were below average at all Australian Antarctic stations.
- Casey had its lowest autumn mean maximum temperature since 2000 at -9.7 °C. The average for autumn is -7.6 °C.
- Autumn precipitation at Macquarie Island was above average, the station recorded 349.2 mm of rainfall, compared to the average for autumn at 284.9 mm.
- At Macquarie Island, both the mean maximum and mean minimum temperatures were 0.8 °C above average.
- The strongest wind gust recorded this autumn at Macquarie Island was 122 km/h on 11 April.
Extremes Records Summaries Important notes the top
| Record highest autumn temperature | ||||||
|---|---|---|---|---|---|---|
| New record (°C) |
Old record |
Years of record |
Average for Autumn |
|||
| Cocos Island Airport | 32.8 | on 7 March | =32.8 | on 07 Apr 2024 | 74 | 29.8 |
| Record highest autumn mean maximum temperature | |||||
|---|---|---|---|---|---|
| New record (°C) |
Old record |
Years of record |
Average for Autumn |
||
| Norfolk Island Aero | 24.1 | =24.1 | in 2016 | 85 | 22.7 |
| Lowest autumn mean maximum temperature for at least 20 years | |||||
|---|---|---|---|---|---|
| Observed (°C) |
Most recent higher |
Average for Autumn |
|||
| Casey | -9.6 | -9.7 | in 2000 | -7.6 | |
note: there may be gaps in the historical record at some sites, so it is possible more recent lower values have gone unreported
| Record highest autumn mean temperature | |||||
|---|---|---|---|---|---|
| New record (°C) |
Old record |
Years of record |
Average for Autumn |
||
| Norfolk Island Aero | 21.7 | =21.7 | in 2016 | 85 | 20.2 |
Extremes Records Summaries Important notes the top
| Summary statistics for autumn 2025 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperatures (°C) |
Minimum temperatures (°C) |
Rainfall (millimetres) |
||||||||||
| Mean for Autumn 2025 |
Diff from average |
Highest for Autumn 2025 |
Mean for Autumn 2025 |
Diff from average |
Lowest for Autumn 2025 |
Total for Autumn 2025 |
Average for Autumn |
Rank of Autumn 2025 |
Fraction of Autumn average |
|||
| Offshore Islands | ||||||||||||
| Lord Howe Island Aero | 24.2 | +0.9 | 28.2 | 17 Mar 2025 | 19.3 | +1.1 | 13.5 | 31 May 2025 | 420.3 | 422.3 | average | 100% |
| Norfolk Island Aero | 24.1 | +1.4 | 27.3 | 1 Mar 2025 | 19.2 | +1.4 | 15.8 | 28 May 2025 | 508.0 | 355.7 | high | 143% |
| Christmas Island Aero | 28.6 | +0.4 | 30.1 | 6 Mar 2025 | 24.0 | +0.5 | 21.5 | 24 Mar 2025 | 1079.0 | 715.2 | high | 151% |
| Cocos Island Airport | 30.5 | +0.8 | 32.8 | 7 Mar 2025 | 25.7 | +0.4 | 23.3 | 24 May 2025 | 657.0 | 670.2 | average | 98% |
| Antarctica and Macquarie Island | ||||||||||||
| Casey | -9.6 | -2.0 | 1.6 | 13 Mar 2025 | -16.2 | -1.9 | -30.0 | 27 May 2025 | 77.0 | 64.3 | average | 120% |
| Davis | -11.3 | -1.7 | 1.8 | 12 Mar 2025 | -17.4 | -2.0 | -28.9 | 22 May 2025 | 16.8 | 28.6 | low | 59% |
| Macquarie Island | 7.8 | +0.8 | 10.6 | 20 Mar 2025 | 4.5 | +0.8 | -1.7 | 31 May 2025 | 350.0 | 284.9 | high | 123% |
| Mawson | -11.5 | -0.7 | -2.8 | 13 Mar 2025 | -17.3 | -0.7 | -26.7 | 12 May 2025 | ||||
Extremes Records Summaries Important notes the top
Notes
The Seasonal climate summary, usually published in the first week of the following month, lists the main features of the weather in Remote Islands and Antarctica using the most timely and accurate information available on the date of publication; it will generally not be updated.
This statement has been prepared based on information available on Wednesday 18 June 2025. Some checks have been made on the data, but it is possible that results will change as new information becomes available.
In some situations, some or all of the rainfall is in the form of hail or snow. In these cases, the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.
Averages for individual sites are long-term means based on observations from
all available years of record, excluding the current year. The length of record can
vary widely from site to site. Averages are not shown for sites with fewer than
10 years of record, as they cannot then be calculated reliably.
The median
is sometimes more representative than the
mean
of long-term average rain.
The Rank indicates how rainfall this time compares with the climate record for the site,
based on the
decile ranking
(very low rainfall is in decile 1, low in decile 2 or 3,
average in decile 4 to 7, high in decile 8 or 9
and very high is in decile 10).
The Fraction of average shows how much rain has fallen this time as a
percentage of the long-term mean.
Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.
Information about Australian Indigenous seasonal calendars is available at the Indigenous Weather Knowledge website.
Unless otherwise noted, all maps, graphs and diagrams in this page are licensed under the Creative Commons Attribution 4.0 International Licence
