Friday 12 September 2025 - Monthly Climate Summary for Remote Islands and Antarctica - Product code IDCKGC1RR0
Remote Islands and Antarctica in August 2025
Jump to a map of the areas covered in this summary
Australia's Indian Ocean islands
- The monthly rainfall total at Christmas Island Aero was 47.2 mm, this was close to the August average rainfall of 41.7 mm.
- At Christmas Island Aero, both the mean maximum and minimum temperatures were 0.7 °C above average.
- The monthly rainfall total at Cocos Island Airport was 455.2 mm and the highest total August rainfall since 1973. The average August rainfall for the station is 118.8 mm.
- At Cocos Island Airport, the mean maximum temperature was 0.6 °C above average and the mean minimum temperature was 0.3 °C above average.
- On the 8th, Cocos Island Airport, had its equal warmest August day on record at 31.0 °C.
Australia's Pacific Ocean islands
- Norfolk Island Aero recorded a monthly rainfall total of 249.0 mm, this was above the average August rainfall of 124.0 mm and the highest since 1950.
- At Norfolk Island Aero, the mean maximum temperature was 0.7 °C above average and the mean minimum temperature was 1.3 °C above average.
- The monthly rainfall total at Lord Howe Island Aero was 210.8 mm, this was above the average rainfall of 109.6 mm. This was the 2nd highest August rainfall on record for the station and the highest total August rainfall since 1990. Most of the monthly rainfall occurred early in the month when a low pressure system moved across the island.
- At Lord Howe Island Aero, the mean maximum temperature was 0.2 °C above average and the mean minimum temperature was 0.9 °C above average.
Australia's Antarctic and sub-Antarctic territories
- The strongest wind gust recorded at the Australian Antarctic stations during August was 207 km/h at Casey on the evening of the 11th.
- Mean maximum and mean minimum temperatures for August were below average at Davis and Mawson, and above average at Casey.
- Monthly precipitation at Macquarie Island was 85.4 mm, this was 110 % of the August average rainfall of 77.6 mm.
- At Macquarie Island the mean maximum temperature was 0.9 °C above average and the mean minimum temperature was 1.4 °C above average.
- The strongest wind gust recorded in August at Macquarie Island was 117 km/h on the evening of the 1st.
Extremes Records Summaries Daily observations Important notes the top
| Record highest August daily rainfall | ||||||
|---|---|---|---|---|---|---|
| New record (mm) |
Old record |
Years of record |
Average for August |
|||
| Lord Howe Island (Milky Way) | 62.0 | on the 3rd | 60.0 | on 06 Aug 2006 | 26 | 114.3 |
| Record highest August total rainfall | |||||
|---|---|---|---|---|---|
| New record (mm) |
Old record |
Years of record |
Average for August |
||
| Lord Howe Island (Milky Way) | 230.0 | 223.8 | in 2011 | 24 | 114.5 |
| Highest August total rainfall for at least 20 years | |||||
|---|---|---|---|---|---|
| Observed (mm) |
Most recent higher |
Average for August |
|||
| Norfolk Island Aero | 249.0 | 261.9 | in 1950 | 125.0 | |
| Lord Howe Island Aero | 210.8 | 286.0 | in 1990 | 112.4 | |
| Cocos Island Airport | 455.2 | 456.0 | in 1973 | 120.7 | |
note: there may be gaps in the historical record at some sites, so it is possible more recent higher values have gone unreported
| Record highest August temperature | ||||||
|---|---|---|---|---|---|---|
| New record (°C) |
Old record |
Years of record |
Average for August |
|||
| Cocos Island Airport | 31.0 | on the 8th | =31.0 | on 10 Aug 2024 | 74 | 28.1 |
Extremes Records Summaries Daily observations Important notes the top
| Summary statistics for August 2025 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperatures (°C) |
Minimum temperatures (°C) |
Rainfall (millimetres) |
||||||||||
| Mean for August 2025 |
Diff from average |
Highest for August 2025 |
Mean for August 2025 |
Diff from average |
Lowest for August 2025 |
Total for August 2025 |
Average for August |
Rank of August 2025 |
Fraction of August average |
|||
| Offshore Islands | ||||||||||||
| Lord Howe Island Aero | 19.3 | +0.2 | 21.9 | 27th | 14.5 | +0.9 | 9.5 | 13th | 210.8 | 109.6 | high | 192% |
| Norfolk Island Aero | 19.1 | +0.7 | 20.9 | 30th | 14.6 | +1.3 | 11.6 | 11th | 249.0 | 124.0 | high | 201% |
| Christmas Island Aero | 26.8 | +0.7 | 27.5 | 25th | 23.0 | +0.7 | 21.3 | 29th | 47.2 | 41.7 | average | 113% |
| Cocos Island Airport | 28.7 | +0.6 | 31.0 | 11th | 24.3 | +0.3 | 22.3 | 30th | 455.2 | 118.8 | high | 383% |
| Antarctica and Macquarie Island | ||||||||||||
| Casey | -10.2 | +0.6 | -3.8 | 7th | -17.9 | +0.8 | -26.8 | 2nd | 20.6 | 19.2 | average | 107% |
| Davis | -14.7 | -0.8 | -4.5 | 7th | -21.4 | -0.8 | -29.2 | 22nd | 3.2 | 6.5 | average | 49% |
| Macquarie Island | 6.0 | +0.9 | 7.9 | 15th | 3.0 | +1.4 | -4.1 | 31st | 85.4 | 77.6 | average | 110% |
| Mawson | -16.2 | -1.1 | -4.4 | 7th | -23.5 | -2.1 | -30.4 | 3rd | ||||
Extremes Records Summaries Daily observations Important notes the top
| Daily maximum temperatures for August 2025 | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Offshore Islands | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| Lord Howe Island Aero | 18.8 | 18.2 | 19.1 | 20.0 | 21.4 | 20.5 | 20.1 | 18.1 | 19.6 | 17.8 | 18.0 | 18.5 | 19.1 | 18.2 | 18.4 | 19.4 | 18.6 | 18.2 | 18.9 | 18.9 | 19.2 | 18.8 | 19.5 | 18.8 | 19.6 | 19.9 | 21.9 | 20.8 | 20.8 | 21.1 | 18.6 |
| Norfolk Island Aero | 19.0 | 18.7 | 18.7 | 20.0 | 19.8 | 19.7 | 20.9 | 18.6 | 18.5 | 15.8 | 17.9 | 18.5 | 18.3 | 17.3 | 19.0 | 20.2 | 20.5 | 20.7 | 18.9 | 18.1 | 18.2 | 18.0 | 19.4 | 18.8 | 18.2 | 18.4 | 19.9 | 20.4 | 20.9 | 20.0 | |
| Christmas Island Aero | 25.5 | 27.1 | 26.4 | 26.9 | 27.2 | 27.1 | 26.8 | 27.4 | 26.4 | 26.5 | 26.9 | 26.8 | 27.0 | 27.3 | 26.9 | 26.4 | 27.5 | 27.2 | 26.9 | 27.1 | 27.5 | 27.5 | 27.5 | 27.2 | 27.5 | 24.9 | 26.0 | 26.0 | 26.1 | 25.8 | 26.7 |
| Cocos Island Airport | 28.8 | 28.7 | 28.1 | 27.5 | 27.4 | 28.2 | 29.1 | 31.0 | 28.1 | 29.7 | 31.0 | 30.2 | 30.5 | 29.7 | 29.0 | 28.7 | 29.1 | 30.3 | 30.3 | 30.4 | 28.3 | 29.2 | 26.0 | 26.0 | 26.6 | 27.7 | 28.1 | 28.1 | 28.2 | 27.2 | 28.3 | Antarctica and Macquarie Island | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| Casey | -18.8 | -19.1 | -12.1 | -7.7 | -7.3 | -6.0 | -3.8 | -4.3 | -4.0 | -5.2 | -5.3 | -7.4 | -9.3 | -14.9 | -10.7 | -9.5 | -9.3 | -8.8 | -15.9 | -11.7 | -5.5 | -8.6 | -15.6 | -17.1 | -15.3 | -13.0 | -13.4 | -15.7 | -12.6 | -4.3 | -4.8 |
| Davis | -20.5 | -21.9 | -22.1 | -23.0 | -11.0 | -12.0 | -4.5 | -4.9 | -6.5 | -11.5 | -14.1 | -13.3 | -17.7 | -17.4 | -13.6 | -14.1 | -17.1 | -17.3 | -18.7 | -19.7 | -20.7 | -22.2 | -15.7 | -13.9 | -7.7 | -8.9 | -10.4 | -12.0 | -11.5 | -14.4 | -18.8 |
| Macquarie Island | 6.2 | 6.8 | 7.8 | 7.0 | 5.2 | 5.6 | 6.4 | 5.4 | 6.2 | 6.8 | 5.8 | 7.5 | 7.9 | 4.8 | 5.1 | 5.0 | 6.2 | 7.0 | 7.0 | 7.6 | 6.8 | 7.2 | 6.4 | 6.3 | 6.4 | 6.8 | 2.1 | -0.9 | 2.4 | ||
| Mawson | -21.0 | -23.4 | -24.5 | -24.5 | -19.2 | -11.3 | -4.4 | -5.9 | -8.2 | -8.5 | -15.5 | -18.5 | -19.2 | -20.5 | -21.4 | -17.2 | -18.3 | -20.1 | -18.7 | -20.2 | -22.6 | -23.0 | -16.8 | -15.6 | -7.7 | -7.8 | -8.0 | -13.4 | -14.3 | -14.0 | -18.1 |
|
Values are the maximum temperature, usually in the 24 hours from 9 am on the day indicated, and typically occurred in the afternoon of that day. | |||||||||||||||||||||||||||||||
| Temperatures coloured according to their difference from the long-term average for the period |
-10.0 | -9.0 | -8.0 | -7.0 | -6.0 | -5.0 | -4.0 | -3.0 | -2.0 | -1.0 | 0.0 | +1.0 | +2.0 | +3.0 | +4.0 | +5.0 | +6.0 | +7.0 | +8.0 | +9.0 | +10.0 | °C | Grey outline marks highest and lowest for the period |
||||||||
| Daily minimum temperatures for August 2025 | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Offshore Islands | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| Lord Howe Island Aero | 13.7 | 15.6 | 14.8 | 12.0 | 17.4 | 16.5 | 17.5 | 14.0 | 14.7 | 14.7 | 13.2 | 12.4 | 9.5 | 9.7 | 13.9 | 12.8 | 13.1 | 14.5 | 13.1 | 14.2 | 15.5 | 15.9 | 15.5 | 15.7 | 14.8 | 16.5 | 17.2 | 17.7 | 14.0 | 15.2 | 14.1 |
| Norfolk Island Aero | 14.8 | 14.0 | 14.6 | 15.3 | 15.5 | 16.7 | 16.9 | 16.5 | 14.4 | 14.2 | 11.6 | 12.6 | 13.2 | 13.8 | 13.9 | 13.5 | 15.3 | 14.3 | 15.2 | 14.3 | 14.0 | 14.0 | 14.5 | 15.6 | 14.8 | 15.6 | 15.9 | 13.6 | 12.9 | 16.3 | |
| Christmas Island Aero | 22.5 | 23.3 | 23.6 | 23.7 | 23.9 | 24.0 | 23.8 | 23.6 | 23.1 | 22.9 | 22.6 | 23.1 | 23.9 | 23.7 | 23.4 | 23.2 | 22.3 | 23.6 | 23.0 | 23.1 | 23.2 | 23.3 | 23.1 | 22.8 | 23.1 | 21.8 | 21.8 | 22.0 | 21.3 | 22.7 | 22.9 |
| Cocos Island Airport | 25.4 | 25.3 | 23.7 | 25.5 | 24.2 | 24.6 | 24.1 | 26.0 | 24.6 | 23.6 | 25.1 | 26.3 | 24.4 | 24.6 | 26.4 | 23.7 | 23.7 | 24.8 | 26.1 | 23.6 | 23.9 | 22.4 | 24.4 | 23.8 | 22.3 | 24.1 | 24.9 | 23.5 | 22.9 | 22.3 | 22.7 | Antarctica and Macquarie Island | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| Casey | -19.8 | -26.8 | -21.8 | -22.0 | -14.0 | -11.9 | -9.8 | -8.6 | -7.7 | -10.6 | -10.7 | -9.0 | -9.6 | -19.3 | -25.0 | -25.1 | -19.9 | -19.9 | -19.2 | -22.5 | -21.4 | -13.8 | -18.8 | -21.7 | -21.7 | -21.0 | -20.5 | -21.2 | -23.8 | -25.2 | -12.8 |
| Davis | -24.4 | -25.7 | -25.4 | -28.6 | -29.0 | -27.5 | -15.6 | -16.8 | -9.7 | -12.9 | -19.3 | -18.1 | -17.8 | -26.6 | -26.5 | -18.7 | -20.2 | -20.1 | -24.8 | -23.0 | -25.3 | -29.2 | -28.3 | -27.3 | -18.3 | -14.8 | -11.8 | -19.4 | -18.9 | -15.6 | -22.6 |
| Macquarie Island | 0.8 | 1.2 | 3.3 | 6.1 | 3.7 | 1.2 | 1.6 | 4.4 | 3.6 | 4.5 | 4.9 | 2.5 | 2.2 | 3.6 | -0.2 | 0.6 | 1.9 | 4.9 | 6.0 | 5.4 | 6.1 | 4.9 | 5.3 | 5.2 | 5.4 | 3.9 | -2.2 | -3.8 | -4.1 | ||
| Mawson | -24.8 | -27.0 | -30.4 | -30.3 | -28.8 | -27.8 | -25.2 | -20.3 | -15.0 | -13.8 | -18.4 | -23.1 | -23.1 | -23.4 | -26.4 | -26.8 | -23.6 | -23.9 | -26.7 | -27.8 | -26.0 | -28.7 | -28.8 | -24.8 | -22.3 | -18.9 | -11.5 | -18.6 | -19.9 | -20.0 | -21.4 |
|
Values are the minimum temperature, usually in the 24 hours to 9 am on the day indicated, and typically occurred that morning. | |||||||||||||||||||||||||||||||
| Temperatures coloured according to their difference from the long-term average for the period |
-10.0 | -9.0 | -8.0 | -7.0 | -6.0 | -5.0 | -4.0 | -3.0 | -2.0 | -1.0 | 0.0 | +1.0 | +2.0 | +3.0 | +4.0 | +5.0 | +6.0 | +7.0 | +8.0 | +9.0 | +10.0 | °C | Grey outline marks highest and lowest for the period |
||||||||
| Daily rainfall for August 2025 | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Offshore Islands | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
| Lord Howe Island (Milky Way) | - | 0.4 | 62.0 | 60.4 | 1.6 | 2.4 | - | 0.6 | 1.8 | 2.8 | 1.6 | 3.8 | - | 2.6 | 3.2 | 0.6 | 2.2 | 2.6 | 1.8 | 1.0 | - | 0.6 | 4.2 | 46.8 | 13.2 | 6.8 | 0.4 | 0.6 | 0.8 | 0.6 | 4.6 | |
| Lord Howe Island Aero | 0.2 | - | 58.6 | 64.2 | 1.2 | 2.0 | 1.2 | 0.6 | 0.4 | 0.6 | 5.0 | 6.6 | - | 0.4 | 3.4 | 0.8 | 1.6 | 0.4 | 5.8 | 0.2 | - | - | 1.8 | 5.6 | 41.8 | 0.2 | - | 1.0 | 1.2 | 1.4 | 4.6 | |
| Norfolk Island Aero | 10.4 | - | 3.6 | 108.4 | 4.0 | 5.8 | 1.8 | 3.8 | - | - | 13.2 | 0.2 | - | - | 13.4 | - | 0.8 | 0.2 | - | - | - | 0.8 | - | - | 5.8 | 65.6 | 3.0 | 0.4 | 7.6 | 0.2 | - | |
| Christmas Island Aero | 0.8 | 0.2 | 0.2 | - | - | - | - | - | - | - | - | - | - | 0.2 | - | - | 5.8 | - | - | - | - | - | - | - | 1.0 | 26.0 | 11.0 | - | 1.6 | - | 0.4 | |
| Cocos Island Airport | 0.2 | - | 1.6 | 24.0 | 84.2 | 28.4 | 26.4 | - | 2.4 | 40.0 | 3.4 | - | 2.8 | 1.4 | - | 3.6 | 1.8 | 5.0 | 1.4 | 10.4 | 56.0 | 40.4 | 31.6 | 17.8 | 55.2 | 5.2 | 0.2 | 1.6 | 0.8 | 8.8 | 0.6 | Antarctica and Macquarie Island | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| Casey | 0.2 | - | 0.4 | - | - | 1.4 | 0.6 | 0.6 | - | 6.4 | 3.0 | - | - | 0.6 | 2.0 | 0.8 | - | - | - | - | - | 0.2 | - | - | - | - | - | 1.4 | 3.0 | |||
| Davis | - | - | - | - | - | - | - | - | - | - | - | - | 0.4 | - | - | - | - | - | - | - | - | - | 1.0 | 1.6 | 0.2 | - | - | - | ||||
| Macquarie Island | 1.4 | 6.0 | 0.2 | 0.2 | 7.6 | 2.8 | 1.4 | 0.6 | 0.6 | 0.4 | 0.2 | 0.8 | 4.2 | 2.6 | 0.8 | 3.2 | 6.4 | 1.4 | 0.2 | 1.4 | 2.8 | 3.2 | 0.2 | 2.2 | - | 3.8 | 19.8 | 7.8 | 3.0 | 0.2 | ||
|
Most values are the precipitation in the 24 hours to 9 am on the day indicated.
Days marked with → are part of a longer accumulation, which is shown on the final day. Values over 100 mm have been rounded to the nearest whole millimetre. Days marked with - have a rainfall report of zero; days left blank have no rainfall report (which often indicates no rain fell). | ||||||||||||||||||||||||||||||||
| Rainfalls coloured according to the amount |
0 | 1.0 | 5.0 | 10.0 | 15.0 | 25.0 | 50.0 | 100 | 150 | 200 | 300 | 400 | 600 | millimetres | ||||||||||||||||||
Extremes Records Summaries Daily observations Important notes the top
Notes
The Monthly 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 Friday 12 September 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
