Remote Islands and Antarctica in December 2017

Australia's Indian Ocean islands

  • Tropical cyclone Dahlia brought Christmas Island 100 mm of rain in the 24 hours to 9 am on the 1st, following record-breaking rain at the end of November; in the week ending 1 December Christmas Island Airport had registered over 500 mm of rain
  • Another 130 mm of rain from the 19th gave Christmas Island a December total of 346 mm, more than 50% above the long-term average
  • Temperatures were above average overall on Christmas Island, despite some relatively cool days in heavy rain
  • Cocos Islands Airport received a near-average 98 mm of rain for the month, with most falling in the final week
  • Temperatures on the Cocos (Keeling) Islands were close to average overall

Australia's Pacific Ocean islands

  • Lord Howe Island had a run of warm days in the second half of the month, including their highest December temperature on record with 28.4 °C on the 25th, ensuring mean temperatures for the month were a degree and a half warmer than average
  • Much of the month was dry on Lord Howe Island, but wet weather around the 5th and again at the end of the month gave a near-average total of 110.8 mm
  • Norfolk Island had warm days in the second half of the month, and December's mean temperatures about a degree warmer than average
  • Norfolk Island's 57.2 mm was about two-thirds of the December average, with most falling in two days up to the 12th

Australia's Antarctic and sub-Antarctic territories

  • Temperatures at Mawson and Davis were about half a degree cooler than average, whilst Casey's temperatures were close to average
  • Macquarie Island was warmer than average for December, and on the 6th reached 10 °C for the first time since the end of March
  • Macquarie Island's rainfall of 87.8 mm was a little above average, and scattered right through the month

Further information

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Record highest December temperature
New record
(°C)
Old
record
Years of
record
Average for
December
Lord Howe Island Aero 28.4 on the 25th 28.3 on the 20th in 1997 30 24.0



Summary statistics for December 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Precipitation
(millimetres)
Mean for
December
2017
Diff
from
average
Highest for
December
2017
Mean for
December
2017
Diff
from
average
Lowest for
December
2017
Total for
December
2017
Average
for
December
Rank of
December
2017
Fraction of
December
average
Offshore Islands (district 200)
Christmas Island Aero 28.2 +0.4 30.0 29th 22.8 +0.2 20.6 23rd 346.0 224.9 high 154%
Cocos Island Airport 29.5 +0.1 30.4 9th 24.5 -0.1 22.2 4th 98.4 118.2 average 83%
Lord Howe Island Aero 25.5 +1.5 28.4 25th 20.6 +1.4 17.6 14th 110.8 105.8 average 105%
Norfolk Island Aero 24.4 +1.0 25.9 24th 18.6 +0.8 17.0 30th 57.2 86.5 average 66%
Antarctica and Macquarie Island (district 300)
Casey 1.5 0.0 5.0 28th -4.1 -0.5 -7.5 11th 13.4 13.1 average 102%
Davis 1.8 -0.7 7.9 23rd -2.7 -0.6 -6.4 2nd 1.0 1.9 average 53%
Macquarie Island 8.7 +0.8 10.9 23rd 5.0 +0.7 0.7 12th 87.8 80.7 average 109%
Mawson 1.7 -0.4 5.7 24th -3.8 -0.5 -8.5 5th
Note: Precipitation values from Casey and Davis should be used with caution.

Daily maximum temperatures for December 2017
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero26.628.227.928.029.428.428.428.627.927.826.628.228.028.128.329.928.925.225.728.127.827.828.628.528.728.728.729.130.029.629.0
Cocos Island Airport28.529.729.229.529.529.630.429.328.929.129.129.929.329.830.029.329.830.130.129.329.529.329.929.729.930.229.329.429.1
Lord Howe Island Aero23.924.624.924.623.823.825.725.125.425.223.824.824.424.725.625.624.925.225.526.927.727.725.827.028.425.325.425.525.727.226.4
Norfolk Island Aero23.823.623.623.723.223.724.825.025.824.623.524.423.323.724.424.724.224.024.324.125.125.325.625.925.624.024.824.924.223.723.4
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey-0.1-0.1-0.6-0.7-0.9-0.41.1-0.9-1.5-1.4-0.21.73.92.51.21.82.00.81.21.93.44.41.31.73.34.83.45.03.62.32.8
Davis-1.2-2.5-0.8-0.6-0.22.52.40.31.0-0.41.31.00.11.71.92.61.23.21.7-0.21.85.97.93.03.63.02.02.63.63.24.6
Davis (Whoop Whoop)-4.3-7.6-6.3-4.7-5.5-4.6-3.9-6.3-4.6-4.2-5.8-5.41.12.11.70.9-1.34.44.05.30.71.6
Macquarie Island6.97.88.48.69.110.310.49.58.77.75.86.17.58.28.39.17.28.38.39.58.79.310.910.19.58.59.58.99.39.29.2
Mawson1.3-1.2-1.2-1.6-0.40.71.92.01.40.90.71.02.00.30.1-0.11.51.92.51.2-0.62.85.05.74.53.83.42.72.33.83.6
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 December 2017
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero23.122.323.424.123.622.421.622.424.024.123.522.923.823.922.422.622.722.622.022.122.521.120.621.323.423.924.123.723.123.121.8
Cocos Island Airport25.224.123.122.224.825.024.325.324.924.925.425.425.224.024.723.724.424.024.723.524.024.324.924.225.224.724.624.3
Lord Howe Island Aero20.420.721.021.421.318.518.420.420.120.720.420.320.017.620.921.121.120.720.521.821.721.920.018.319.821.021.521.521.021.521.9
Norfolk Island Aero19.018.717.818.618.218.519.119.119.320.417.917.417.918.718.518.817.818.617.918.018.919.819.918.918.820.219.419.817.717.017.5
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey-7.1-6.6-5.6-4.5-6.8-3.5-5.8-4.1-5.1-4.5-7.5-4.7-3.5-2.5-4.9-7.2-6.8-3.6-6.3-6.6-4.4-3.7-0.5-1.8-0.8-1.6-1.4-0.9-2.1-1.4-0.3
Davis-4.7-6.4-6.4-5.0-3.1-2.9-0.7-2.1-3.4-3.9-3.2-3.4-3.3-4.3-2.4-4.2-2.1-1.2-1.5-2.2-1.9-0.91.2-1.1-1.9-1.3-2.7-3.1-2.0-2.3-2.5
Davis (Whoop Whoop)-15.6-15.3-12.4-8.8-6.8-7.9-6.3-9.3-10.3-12.3-11.6-10.4-11.4-11.7-7.9-12.4-9.9-8.9-11.1-11.8-8.6-9.1
Macquarie Island6.63.53.62.25.16.56.57.36.23.41.90.71.94.35.75.95.53.53.35.15.16.66.26.05.13.45.77.27.47.16.6
Mawson-6.0-6.8-7.2-7.8-8.5-6.1-1.8-0.9-2.8-3.9-3.1-3.4-3.0-5.0-5.1-5.2-5.1-2.1-1.2-3.4-1.2-2.5-1.9-1.5-2.4-2.2-2.6-3.1-4.5-4.2-2.3
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 December 2017
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero 104 - - 4.6 1.2 - 0.2 0.4 2.4 9.6 9.0 6.6 1.6 0.2 3.2 - - 29.2 102 39.6 6.8 1.0 0.2 - 1.8 13.2 - 1.4 7.2 - -
Cocos Island Airport - - 1.2 - - 2.8


- - - - - - 3.2
- 1.2 - - - 1.0 3.2 - - 18.0 - 2.6 8.2 57.0
Lord Howe Island (Milky Way) - 1.4 - - - 31.8 8.8 - - - 1.2 - - - - - - - - - - - - - - - 6.4 - - - 56.6
Lord Howe Island Aero - - - - - 28.0 8.0 - - - - - - - - - - - - - - - - 1.4 - - 6.2 - - - 67.2
Norfolk Island Aero - - - -
- - 0.6 - - 37.8 13.8 - 0.2 1.8 - - - - - - 0.2 - - 1.2 0.4 0.8 - - - 0.4
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey - - -
- - - - - - - 5.4 7.4
-
- - -
- - - 0.2 - - - 0.4 - -
Davis - - - - 1.0 - - - - - - - - - - -
- - - - - - - - - - - - - -
Macquarie Island 3.8 2.0 - - - - 7.4 4.2 - 2.4 1.4 1.4 0.2 2.6 5.6 2.4 1.8 1.0 1.8 4.2 13.6 0.4 2.0 4.6 3.8 0.4 3.0 0.4 8.2 0.4 8.8
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 on Tuesday 9 January 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