Remote Islands and Antarctica in summer 2017-18

Australia's Indian Ocean islands

  • The mean maximum temperature at Cocos Islands Airport was a little above the long-term average for summer and the mean minimum just a little below average, but it was the coolest summer in the 17 years since 2000–2001
  • Total rainfall at Cocos Islands Airport of 710 mm was almost one and half times the long-term summer average
  • Temperatures on Christmas Island were a little above average overall
  • Total rainfall for summer at Christmas Island is uncertain (because of problems with the equipment during January), but was in excess of 1120 mm, well above the long-term average of around 850 mm.

Australia's Pacific Ocean islands

  • The mean temperature at Norfolk Island Airport was almost a degree above the long-term summer average
  • With strong winds and cloudy skies from the decaying tropical cyclone Gita, and nearby sea surface temperatures much warmer than usual, the temperature at Norfolk Island Airport did not drop below 24.4 °C on 19 February, the highest daily minimum temperature in 79 years of record; on the 18th the minimum was a near-record 24.2 °C and on the 20th it was 24.0 °C
  • Norfolk Island Airport recorded 405.8 mm of rainfall over summer, well above the long-term average of 270 mm and included the wettest January since 1986
  • Lord Howe Island Airport's mean summer maximum temperature was about a degree above average, whilst its mean minimum temperature was about half a degree above average
  • Total rainfall at Lord Howe Island Airport was 222.2 mm, about 69% of the long-term summer average

Australia's Antarctic and sub-Antarctic territories

  • Temperatures at Mawson were below average overall, and included an unusual spell of below-zero days in January and a string of cold nights in February
  • At Davis, daytime temperatures were above average but overnight temperatures a little below average
  • Casey's daytime temperatures were close to average overall, with nights a little cooler than average
  • Macquarie Island was about half a degree warmer than average by day and by night, with a relatively mild December and January balanced against a cool February
  • Total summer rainfall for Macquarie Island was a little above average

Further information

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Record highest summer daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
summer
Norfolk Island Aero 24.4 on 19 Feb 2018 24.3 on 20 Feb 2009 79 18.9



Summary statistics for summer 2017-18
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Precipitation
(millimetres)
Mean for
summer
2017-18
Diff
from
average
Highest for
summer
2017-18
Mean for
summer
2017-18
Diff
from
average
Lowest for
summer
2017-18
Total for
summer
2017-18
Average
for
summer
Rank of
summer
2017-18
Fraction of
summer
average
Offshore Islands (district 200)
Christmas Island Aero 28.2 +0.3 30.0 29 Dec 2017 22.9 +0.2 20.6 23 Dec 2017 at least
1190
854.6
Cocos Island Airport 29.8 +0.1 32.1 9 Feb 2018 24.8 -0.1 22.2 4 Dec 2017 710.0 473.5 high 150%
Lord Howe Island Aero 25.9 +0.9 29.0 17 Feb 2018 20.8 +0.5 16.5 7 Jan 2018 222.2 320.2 average 69%
Norfolk Island Aero 25.2 +0.9 28.3 27 Feb 2018 19.9 +1.0 17.0 30 Dec 2017 405.8 270.1 v high 150%
Antarctica and Macquarie Island (district 300)
Casey 1.2 0.0 6.1 10 Jan 2018 -3.8 -0.1 -9.5 9 Feb 2018 55.6 39.7 average 140%
Davis 1.9 +0.1 8.3 5 Jan 2018 -2.8 -0.2 -10.8 28 Feb 2018 7.6 7.8 average 97%
Macquarie Island 9.0 +0.5 10.9 23 Dec 2017 5.5 +0.5 0.6 5 Feb 2018 276.6 253.8 average 109%
Mawson 0.9 -0.2 6.0 13 Jan 2018 -4.9 -0.5 -14.3 27 Feb 2018
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 Thursday 1 March 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