Remote Islands and Antarctica in April 2018

Australia's Indian Ocean islands

  • Temperatures were a about half a degree above average on Christmas Island, and a little above average on the Cocos (Keeling) Islands
  • There were some cool nights toward the end of the month, with Cocos Island Airport's minimum temperature of 22.6 °C on the 25th the lowest for April since 2005
  • Rainfall was a little below average on Christmas Island, but less than two-thirds of the April average on the Cocos (Keeling) Islands

Australia's Pacific Ocean islands

Australia's Antarctic and sub-Antarctic territories

Further information

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Record highest April mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Lord Howe Island Aero 24.6 24.4 in 2016 29 23.3

Highest April mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
April
Mawson -8.1 -7.6 in 1991 -11.8



Record highest April daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Lord Howe Island Aero 23.5 on the 15th = 23.5 on the 1st in 1998 30 18.1



Highest April mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
April
Casey -10.3 -9.1 in 1991 -14.8



Record highest April mean temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Lord Howe Island Aero 21.9 = 21.9 in 2016 29 20.7

Highest April mean temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
April
Casey -7.3 -6.5 in 1991 -11.3
Mawson -11.0 -10.1 in 1991 -14.7



Summary statistics for April 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Precipitation
(millimetres)
Mean for
April
2018
Diff
from
average
Highest for
April
2018
Mean for
April
2018
Diff
from
average
Lowest for
April
2018
Total for
April
2018
Average
for
April
Rank of
April
2018
Fraction of
April
average
Offshore Islands (district 200)
Christmas Island Aero 28.9 +0.6 30.8 3rd 24.1 +0.6 21.6 26th 193.8 229.7 average 84%
Cocos Island Airport 29.9 +0.1 31.4 29th 25.6 +0.3 22.6 25th 163.4 249.9 low 65%
Lord Howe Island Aero 24.6 +1.3 27.0 16th 19.2 +1.1 15.4 24th 91.0 143.0 average 64%
Norfolk Island Aero 23.7 +0.9 25.5 16th 18.9 +1.1 16.1 13th 104.2 122.3 average 85%
Antarctica and Macquarie Island (district 300)
Casey -4.2 +3.6 1.9 12th -10.3 +4.5 -16.9 30th 25.5 21.1 average 121%
Davis -6.9 +3.5 -1.9 18th -12.5 +3.7 -19.1 9th 4.6 9.9 low 46%
Macquarie Island 6.9 -0.1 9.2 15th 3.4 -0.3 1.4 9th 117.4 93.6 high 125%
Mawson -8.1 +3.7 -3.4 20th -13.9 +3.6 -19.0 28th
Note: Precipitation values from Casey and Davis should be used with caution.

Daily maximum temperatures for April 2018
Offshore Islands (200)123456789101112131415161718192021222324252627282930
Christmas Island Aero29.229.030.829.429.729.126.927.928.727.028.628.929.529.329.829.529.129.429.529.728.328.627.628.329.129.328.929.1
Cocos Island Airport30.530.530.631.129.830.030.330.229.928.828.728.929.229.930.530.230.230.430.331.129.929.029.927.529.529.429.629.631.430.6
Lord Howe Island Aero25.926.426.125.725.825.926.025.525.624.122.824.125.826.126.927.025.323.223.824.124.122.923.424.824.224.222.520.521.422.5
Norfolk Island Aero24.925.125.124.124.324.924.424.324.324.222.622.323.624.425.325.525.223.523.023.923.721.624.421.822.222.623.523.121.321.1
Antarctica and Macquarie Island (300)123456789101112131415161718192021222324252627282930
Casey-5.8-4.5-5.3-4.9-6.6-6.9-9.8-3.4-3.1-0.4-1.61.91.4-1.0-1.8-7.1-6.5-3.8-6.4-5.6-6.7-3.0-2.3-4.4-6.6-0.2-4.1-3.7-7.8-6.6
Davis-3.4-5.6-7.5-10.2-6.8-6.7-9.4-11.1-12.0-8.6-5.1-6.5-8.2-7.4-9.8-9.6-2.3-1.9-3.1-9.6-8.7-4.2-4.8-4.2-6.5-9.5-11.1-5.7-2.5-4.9
Macquarie Island8.37.96.65.85.57.47.55.55.56.17.08.05.68.59.27.66.96.45.14.76.17.07.17.47.37.96.87.27.67.1
Mawson-8.1-7.7-8.3-10.0-12.7-12.3-9.5-9.2-6.5-3.7-6.2-7.7-7.8-7.5-7.2-6.9-4.2-5.0-3.4-3.4-5.4-11.8-9.4-9.1-9.0-12.4-14.1-8.7-9.4-7.7
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 April 2018
Offshore Islands (200)123456789101112131415161718192021222324252627282930
Christmas Island Aero23.723.123.524.625.524.922.324.124.522.722.625.925.225.325.224.023.922.726.025.123.222.522.221.625.325.225.924.5
Cocos Island Airport26.226.626.426.026.425.626.626.824.324.324.125.226.825.925.926.726.827.026.725.124.625.324.922.625.824.325.226.024.7
Lord Howe Island Aero22.622.618.920.920.919.521.117.917.521.219.316.020.319.923.519.918.218.719.418.620.020.419.015.417.616.720.216.816.017.0
Norfolk Island Aero20.120.520.620.520.018.219.318.417.516.818.118.116.116.919.521.420.320.519.519.019.017.819.020.317.818.419.018.918.116.1
Antarctica and Macquarie Island (300)123456789101112131415161718192021222324252627282930
Casey-11.6-12.9-8.5-7.7-10.2-8.4-10.6-16.6-14.3-10.9-7.1-6.7-5.9-7.6-4.9-9.5-12.7-14.4-9.9-13.4-9.2-8.9-11.9-6.5-6.9-14.5-14.0-7.9-7.9-16.9
Davis-6.5-8.3-12.7-13.6-12.7-10.3-9.7-12.4-19.1-17.0-12.3-9.3-12.9-13.7-15.3-16.0-14.0-12.5-3.8-13.2-12.7-13.9-13.3-11.0-10.0-13.1-15.3-16.9-16.9-6.2
Macquarie Island4.75.72.81.62.41.93.32.41.43.23.64.13.12.84.76.42.83.12.61.91.92.15.62.62.65.43.34.24.86.4
Mawson-13.0-13.1-13.3-15.1-16.6-17.0-16.4-15.3-12.6-12.6-8.5-10.5-11.4-14.5-14.6-13.7-13.7-9.0-9.4-7.0-9.4-14.6-17.7-17.7-14.2-16.2-18.6-19.0-15.4-15.6
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 April 2018
Offshore Islands (200)123456789101112131415161718192021222324252627282930
Christmas Island Aero - 8.2 - 0.4 - - 8.8 1.6 4.0 16.8 - 1.6 - - 1.8 3.0 29.6 - - 22.0 4.4 19.6 69.8 1.6 - - 0.6
Cocos Island Airport 0.2 - - 2.0 0.2 7.2
- - 3.6 15.0 13.2 1.2 2.8 0.2 1.0 - - - 0.2 2.0 27.6 3.2 12.6 23.8 2.0 23.2 11.0 3.6 7.6
Lord Howe Island (Milky Way) - - - - - 2.0 - - - - - - - 2.2 - 11.8 0.2 0.2 - - - - 8.4 101 6.4 0.2 1.6 10.8 1.2 1.2
Lord Howe Island Aero - - - - - 1.0 - 0.2 - - - - - 2.6 - 8.0 - 10.8 - - 0.8 - 6.2 35.2 9.8 - 0.6 9.4 4.2 2.2
Norfolk Island Aero - - - - - - - - - - 3.0 - - - - - 3.2 - 5.8 - - - 2.4 1.4 38.4 2.4 42.6 2.6 0.4 2.0
Antarctica and Macquarie Island (300)123456789101112131415161718192021222324252627282930
Casey
- - - - 0.2 3.8 0.2 0.4 - 0.6 - 0.1 - - 2.6 - 2.8 2.2 2.4 2.8 6.0 1.4
- - - - - -
Davis - - - - - 1.6 1.0 - - - - - - - - - - - - - - - - - - - - - 0.4 1.6
Macquarie Island 1.8 2.4 5.6 5.0 1.6 9.4 2.8 8.8 2.0 0.4 1.6 13.8 0.2 - 3.6 7.6 - 1.8 9.8 4.4 3.6 1.0 4.2 0.6 4.8 1.6 3.4 1.4 0.6 13.6
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 1 pm on Tuesday 1 May 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