Remote Islands and Antarctica in October 2018

Australia's Indian Ocean islands

  • Temperatures on the Cocos (Keeling) Islands were about half a degree above the October average: warmer than October 2017 but cooler than October 2016
  • Only 6.6 mm of rain was recorded at Cocos Islands Airport, well down on the October average of 82 mm
  • The dry October follows a September with only 12.8 mm of rain, and marks a continuation of the series of months with below-average rain that started in April
  • Problems with the Automatic Weather Station at Christmas Island meant no temperature data are available for October 2018. The site reported only 0.2 mm of rain for the month

Australia's Pacific Ocean islands

  • Temperatures on Lord Howe Island were about half a degree warmer than the October average by day and almost a degree warmer than average by night, with mild weather especially common in the second half of the month
  • Only 34.4 mm of rain was recorded at Lord Howe Island Aero, well down in the October average of 100 mm
  • Norfolk Island's minimum temperatures were more than a degree warmer than the October average, with very few especially cool nights
  • Maximum temperatures on Norfolk Island were just a little above average overall, with a cool spell around the middle of the month
  • Norfolk Island Aero registered 83.4 mm of rain, right on average for October

Australia's Antarctic and sub-Antarctic territories

  • Cold weather at Australia's Antarctic stations in the first half of the month gave way to relatively mild temperatures in the second half
  • Mawson had its coldest October day (lowest maximum temperature) on record on the 1st when the temperature reached just -21.1 °C, but then had its warmest October day on record on the 19th with a maximum of +1.5 °C (the earliest in spring it has been so warm)
  • Overall, temperatures were a little above average at Mawson, about half a degree above average at Davis, and around a degree above average at Casey
  • Macquarie Island's temperatures were about 0.7 °C above the October average
  • Total rainfall on Macquarie Island was a little below average

Further information

Media
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Record highest October temperature
New record
(°C)
Old
record
Years of
record
Average for
October
Mawson 1.5 on the 19th 0.6 on the 31st in 2014 65 -9.9



Record lowest October daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
October
Mawson -21.1 on the 1st -21.0 on the 1st in 1980 65 -9.9



Summary statistics for October 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Precipitation
(millimetres)
Mean for
October
2018
Diff
from
average
Highest for
October
2018
Mean for
October
2018
Diff
from
average
Lowest for
October
2018
Total for
October
2018
Average
for
October
Rank of
October
2018
Fraction of
October
average
Offshore Islands (district 200)
Cocos Island Airport 29.1 +0.4 30.1 12th 24.7 +0.5 22.4 24th 6.6 81.4 low 8%
Lord Howe Island Aero 21.4 +0.5 24.6 10th 16.4 +0.7 11.4 4th 34.4 100.2 v low 34%
Norfolk Island Aero 20.4 +0.2 22.3 27th 16.0 +1.2 13.8 11th 83.4 83.4 average 100%
Antarctica and Macquarie Island (district 300)
Casey -6.9 +1.2 -0.8 21st -14.1 +0.9 -29.7 6th 28.4 16.5 high 172%
Davis -8.2 +0.8 -0.3 16th -15.0 +0.4 -26.7 3rd 0 4.5 lowest 0%
Macquarie Island 6.5 +0.7 8.1 26th 2.7 +0.7 -2.2 4th 71.8 78.4 average 92%
Mawson -9.4 +0.5 1.5 19th -16.6 -0.2 -27.3 1st
Note: Precipitation values from Casey and Davis should be used with caution.

Daily maximum temperatures for October 2018
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Cocos Island Airport28.528.828.829.028.829.029.129.329.129.629.630.129.228.829.429.029.328.828.528.829.028.628.928.929.129.229.229.229.429.9
Lord Howe Island Aero19.319.419.420.121.121.321.421.322.424.619.018.718.119.119.520.421.621.521.322.223.223.323.523.723.923.223.322.020.722.024.0
Norfolk Island Aero21.017.018.620.320.220.819.719.820.121.022.319.619.119.119.720.620.117.420.121.521.821.621.622.021.221.322.321.720.319.920.2
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey-18.0-19.7-20.4-18.2-20.3-9.5-8.2-8.6-5.6-6.5-6.7-5.3-2.4-3.1-0.9-3.2-2.2-6.1-5.0-3.4-0.8-7.5-7.3-6.9-5.5-4.5-2.2-1.0-1.5-1.6-3.1
Davis-20.7-21.2-20.1-19.9-10.9-9.1-12.1-11.8-11.6-14.1-11.7-7.8-5.2-2.4-2.2-0.3-2.9-4.3-8.0-5.7-6.2-8.7-6.2-3.0-2.0-3.9-5.9-5.5-4.8-4.7-2.3
Macquarie Island6.86.55.95.46.66.25.25.44.14.73.66.15.47.77.05.46.98.07.27.37.77.77.58.08.08.16.76.86.36.47.3
Mawson-21.1-19.7-19.8-16.2-15.3-12.9-13.7-12.4-15.8-14.6-9.2-6.6-6.1-9.1-8.1-5.4-3.91.50.5-4.7-7.1-7.9-7.7-5.0-4.2-6.7-9.6-7.6-7.0-7.5
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 October 2018
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Cocos Island Airport24.125.025.325.325.224.625.325.425.625.424.924.524.324.823.825.124.924.724.623.924.924.722.424.624.825.324.423.924.724.3
Lord Howe Island Aero14.714.515.411.415.517.417.418.418.018.515.614.714.614.315.717.217.617.317.917.618.818.119.619.015.618.414.015.517.016.211.5
Norfolk Island Aero15.614.814.815.816.516.316.616.416.016.313.816.614.514.715.116.215.515.315.716.318.217.317.117.716.015.417.016.416.115.815.5
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey-22.8-22.6-26.3-27.5-22.8-29.7-21.7-16.3-18.8-16.7-16.8-16.8-18.1-8.2-5.8-4.7-6.6-13.7-11.1-10.1-8.4-12.2-9.7-13.2-10.6-10.7-8.9-8.2-8.1-6.5-4.5
Davis-23.0-26.6-26.7-24.8-23.3-19.9-14.6-15.7-19.1-17.1-19.4-16.5-13.4-11.9-8.5-7.8-5.5-10.3-15.6-16.9-16.1-14.6-12.8-11.3-7.6-10.8-13.1-9.9-12.2-9.2-11.4
Macquarie Island4.5-0.43.8-2.21.13.70.13.10.50.8-1.1-1.81.72.05.05.22.53.64.43.75.56.16.25.21.85.83.51.72.21.72.8
Mawson-27.3-25.7-25.6-24.8-22.0-19.9-17.7-17.1-21.6-21.3-19.8-15.8-13.4-16.3-16.9-15.7-11.6-10.4-10.4-8.7-13.1-14.4-14.2-14.3-11.3-12.0-16.1-17.2-13.8-10.6
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 precipitation for October 2018
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero - - - - - - - - - - - - - - 0.2 - - - - - - - - - - - - -
Cocos Island Airport
- - - - 0.6 - - - - - - - - 2.2 1.8 - - - - 0.8 - - 0.6 - - - - 0.6 - -
Lord Howe Island (Milky Way) 1.4 1.6 - - - 1.6 4.8 - - - 10.0 - 1.0 1.2 5.0 1.0 2.4 1.2 0.6 0.6 - - - 4.0 - 2.8 11.8 0.2 - 1.2 -
Lord Howe Island Aero 1.2 0.8 0.2 - - 0.4 0.2 0.4 - - 10.0 0.2 2.0 0.8 5.4 0.4 1.8 0.6 - 0.2 0.6 - - 1.2 - 1.0 5.8 0.2 0.2 0.6 0.2
Norfolk Island Aero - 8.0 26.0 3.4 - 3.2 2.2 - - - 0.2 1.0 - - - - 2.0 19.0 7.2 6.0 - -
- - - 1.8 0.2 3.2 - -
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey - 0.2 - - 1.4
20.0 -
- - 0.2 - 0.6 - - - 2.0
- - - - 0.2
3.8
- - - -
Davis - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Macquarie Island 2.8 3.0 1.4 3.0 7.4 0.6 1.4 - 5.6 2.6 5.2 1.8 2.2 - - 10.0 0.4 - 0.2 0.2 3.0 0.4 0.2 2.0 4.2 2.2 0.4 0.6 4.6 1.0 5.4
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 precipitation report of zero; days left blank have no precipitation report (which often indicates no precipitation fell).
Precipitations 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

Map of the areas covered by this summary

Notes

The Monthly 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 4 pm on Thursday 1 November 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