Remote Islands and Antarctica in autumn 2024

Australia's Indian Ocean islands

  • Autumn was wetter than average for Christmas Island Aero, the total rainfall was 817.6 mm compared to the autumn average of 716.4 mm. The site also recorded its highest autumn daily rainfall on record of 183.8 mm on 21 April.
  • At Christmas Island Aero, the mean maximum and minimum temperatures were 0.4 °C and 0.9 °C warmer than average, respectively.
  • Christmas Island Aero recorded its highest autumn mean daily minimum temperature on record of 24.4 °C, the average for autumn is 23.5 °C.
  • At Cocos Island Airport, the autumn rainfall total was below average at 220.2 mm compared to the autumn average of 670.2 mm.
  • At Cocos Island Airport, both the mean maximum and minimum temperatures were 1.0 °C above average.

Australia's Pacific Ocean islands

  • Autumn rainfall at Norfolk Island was 137.0 mm, this was below the site's average for autumn of 355.6 mm.
  • At Norfolk Island Aero, the mean maximum temperature was 0.9 °C above average and the mean minimum temperature was 0.2 °C above average.
  • Lord Howe Island Aero recorded close to average rainfall during autumn. Noting there were several days of missing observations during March and April, and the rainfall total may be higher.
  • At Lord Howe Island Aero, the mean maximum temperature was 0.6 °C above average and the mean minimum temperature was equal to the autumn average.
  • Lord Howe Island Aero recorded its highest autumn temperature on record on 2 March at 29.7 °C, the previous record was 28.2 °C on 21 March 2015.

Australia's Antarctic and sub-Antarctic territories

  • The strongest wind gust during autumn was 181 km/h at Mawson on the morning of 27 May.
  • Both the mean maximum and minimum temperatures for autumn were below average at Australian Antarctic stations.
  • Autumn precipitation at Macquarie Island was above average, with the site recording 350.6 mm of precipitation, compared to the site's average for autumn of 284.9 mm.
  • At Macquarie Island, mean maximum and minimum temperatures were 0.3 °C and 0.5 °C below average, respectively.
  • The strongest wind gust recorded during autumn at Macquarie Island was 98 km/h, this occurred on several days during May.

Record highest autumn daily precipitation
New record
(mm)
Old
record
Years of
record
Christmas Island Aero 183.8 on 21 Apr 173.2 on 20 Mar 2001 52



Record highest autumn total precipitation
New record
(mm)
Old
record
Years of
record
Average for
autumn
Casey 123.0 111.5 in 2002 23 63.1



Record highest autumn temperature
New record
(°C)
Old
record
Years of
record
Average for
autumn
Cocos Island Airport 32.8 on 7 Apr = 32.8 on 7 Apr 2015 73 29.7
Lord Howe Island Aero 29.7 on 2 Mar 28.2 on 21 Mar 2015 36 23.3



Highest autumn mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
autumn
Cocos Island Airport 30.7 30.9 in 1998 29.7



Lowest autumn mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
autumn
Casey -9.5 -9.7 in 2000 -7.5
Macquarie Island 6.7 6.6 in 2000 7.0



Record highest autumn mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
autumn
Christmas Island Aero 24.4 24.3 in 2016 49 23.5

Highest autumn mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
autumn
Cocos Island Airport 26.2 26.5 in 1998 25.2



Lowest autumn mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
autumn
Casey -16.4 -16.7 in 2000 -14.3
Macquarie Island 3.2 3.0 in 2000 3.7



Highest autumn mean temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
autumn
Cocos Island Airport 28.4 28.7 in 1998 27.5



Lowest autumn mean temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
autumn
Casey -13.0 -13.2 in 2000 -10.9
Macquarie Island 4.9 4.8 in 2000 5.4



Summary statistics for autumn 2024
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Precipitation
(millimetres)
Mean for
autumn
2024
Diff
from
average
Highest for
autumn
2024
Mean for
autumn
2024
Diff
from
average
Lowest for
autumn
2024
Total for
autumn
2024
Average
for
autumn
Rank of
autumn
2024
Fraction of
autumn
average
Offshore Islands
Christmas Island Aero 28.6 +0.4 30.3 22 Mar 24.4 +0.9 22.0 22 Mar 817.6 716.4 average 114%
Cocos Island Airport 30.7 +1.0 32.8 7 Apr 26.2 +1.0 21.0 11 Mar 220.2 670.2 v low 33%
Lord Howe Island Aero 23.9 +0.6 29.7 2 Mar 18.2 0.0 9.6 27 May 371.4 421.5 average 88%
Norfolk Island Aero 23.6 +0.9 28.2 4 Mar 18.0 +0.2 13.1 27 May 137.0 355.6 v low 39%
Antarctica and Macquarie Island
Casey -9.5 -2.0 2.1 25 May -16.4 -2.1 -32.0 20 May 123.0 63.1 highest 195%
Davis -9.6 -0.1 0.6 5 Mar -15.9 -0.6 -30.6 21 May 20.3 28.6 average 71%
Macquarie Island 6.7 -0.3 9.7 9 Mar 3.2 -0.5 -1.5 16 Apr 350.6 284.9 high 123%
Mawson -11.4 -0.6 -1.3 13 Mar -17.3 -0.7 -27.7 8 Apr
Note: Precipitation values from Casey and Davis should be used with caution.

Map of the areas covered by this summary

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 at 9 am on Sunday 2 June 2024. 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 precipitation 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, which vary widely from site to site. They are not shown for sites with less 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 precipitation.

The Rank indicates how precipitation this time compares with the climate record for the site, based on the decile ranking (very low precipitation 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 precipitation 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.


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