Remote Islands and Antarctica in autumn 2018

Australia's Indian Ocean islands

  • Temperatures were above average on both Christmas and the Cocos (Keeling) Islands
  • Total rainfall was close to average at Christmas Island Airport, and somewhat below average at Cocos Islands Airport

Australia's Pacific Ocean islands

  • Rainfall was below average for autumn, with both Lord Howe and Norfolk Island airports reporting about two-thirds of their long-term mean totals
  • Temperatures were above average, by more than half a degree on Lord Howe Island and by nearly a degree on Norfolk Island
  • April was especially warm on both Lord Howe and Norfolk Islands
  • Lord Howe Island Airport reported a record cold autumn temperature on 18 May, with a minimum of just 8.7 °C

Australia's Antarctic and sub-Antarctic territories

  • After a generally cool March, temperatures were mostly above average at Australia's Antarctic stations through April and May
  • Overall autumn temperatures were about 1.2 °C above average at Mawson, 1.6 °C above average at Davis, and 0.8 °C above average at Casey
  • On Macquarie Island, daytime temperatures were a little above average, whilst overnight temperatures were a little below average
  • Total rainfall on Macquarie Island was well above average, with each month of autumn wetter than average

Further information

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Record lowest autumn temperature
New record
(°C)
Old
record
Years of
record
Average for
autumn
Lord Howe Island Aero 8.7 on 18 May 9.1 on 14 May 1994 30 18.2



Summary statistics for autumn 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Precipitation
(millimetres)
Mean for
autumn
2018
Diff
from
average
Highest for
autumn
2018
Mean for
autumn
2018
Diff
from
average
Lowest for
autumn
2018
Total for
autumn
2018
Average
for
autumn
Rank of
autumn
2018
Fraction of
autumn
average
Offshore Islands (district 200)
Christmas Island Aero 28.7 +0.6 30.8 3 Apr 23.9 +0.4 21.5 6 Mar 728.6 718.3 average 101%
Cocos Island Airport 29.9 +0.2 31.4 29 Apr 25.5 +0.3 22.6 25 Apr 625.0 677.6 average 92%
Lord Howe Island Aero 23.9 +0.7 27.4 4 Mar 18.7 +0.5 8.7 18 May 287.8 421.0 low 68%
Norfolk Island Aero 23.5 +0.8 27.9 16 Mar 18.7 +1.0 13.6 31 May 232.0 356.1 low 65%
Antarctica and Macquarie Island (district 300)
Casey -6.5 +1.1 1.9 12 Apr -13.7 +0.6 -30.1 14 May 55.3 61.9 average 89%
Davis -8.1 +1.5 -0.2 31 Mar -13.7 +1.7 -24.8 23 May 8.8 28.7 v low 31%
Macquarie Island 7.1 +0.1 10.7 18 Mar 3.6 -0.1 -2.8 20 May 375.8 279.6 v high 134%
Mawson -9.5 +1.3 -1.9 24 Mar -15.6 +1.1 -24.5 22 May
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, generally published on the first working day of each 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. More extensive discussion of significant weather events, along with later information and data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.

This statement has been prepared based on information available at 2 pm on Friday 1 June 2018. 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.

Further information

Media
(03) 9669 4057
Enquiries