Remote Islands and Antarctica in winter 2017

Australia's Indian Ocean islands

  • Daytime temperatures were slightly below average on both Christmas and the Cocos (Keeling) islands, for winter as a whole and also the individual months of June, July and August
  • Overnight temperatures were 0.3 °C above average for winter as a whole
  • Rainfall was above average, mostly the result of a very wet June

Australia's Pacific Ocean islands

  • Norfolk Island's temperatures were more than half a degree above average, with August days particularly warm
  • Lord Howe Island was a little warmer than average by day, and a little cooler than average by night
  • Rainfall was below average, particularly on Norfolk Island which had only 79% of its winter average

Australia's Antarctic and sub-Antarctic territories

  • Casey had its lowest winter mean daily maximum temperature in 28 years of record with −14.1 °C, which is 3.5 °C below the long-term average (although the previous site had a colder winter in 1969); Casey's mean temperature was just 0.1 °C warmer than winter 2014
  • Overall, winter temperatures at both Mawson and Davis were around a degree colder than the long-term average
  • Macquarie Island was about half a degree warmer than average for winter, with above-average rainfall

Further information

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Record lowest winter mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
Casey -14.1 -13.8 in 2014 28 -10.6



Summary statistics for winter 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Precipitation
(millimetres)
Mean for
winter
2017
Diff
from
average
Highest for
winter
2017
Mean for
winter
2017
Diff
from
average
Lowest for
winter
2017
Total for
winter
2017
Average
for
winter
Rank of
winter
2017
Fraction of
winter
average
Offshore Islands (district 200)
Christmas Island Aero 26.4 -0.1 28.3 9 Jun 23.0 +0.3 20.2 18 Jul 592.8 321.3 high 185%
Cocos Island Airport 28.0 -0.2 30.4 2 Jun 24.4 +0.3 22.1 20 Aug 668.6 548.0 high 122%
Lord Howe Island Aero 19.5 +0.2 22.5 12 Aug 14.0 -0.1 8.2 28 Jul 366.4 420.7 average 87%
Norfolk Island Aero 19.4 +0.7 21.4 21 Jun 14.4 +0.6 10.9 29 Jul 323.8 409.9 low 79%
Antarctica and Macquarie Island (district 300)
Casey -14.1 -3.5 -0.6 2 Jun -21.9 -3.4 -30.6 28 Jul 43.2 73.9 low 58%
Davis -14.7 -1.0 -3.6 9 Aug -21.4 -1.3 -35.4 22 Jun
Macquarie Island 5.6 +0.6 8.0 20 Jun 1.8 +0.2 -4.7 25 Jul 260.4 227.1 high 115%
Mawson -15.6 -0.9 -4.3 18 Jul -21.5 -0.8 -30.3 9 Jul
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 September 2017. 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