Remote Islands and Antarctica in August 2019

Australia's Indian Ocean islands

  • Temperatures were below average on the Cocos (Keeling) Islands, especially during the middle of the month
  • Cocos Islands Airport was half a degree cooler than average, registering its lowest August mean daily maximum temperature since 1997 and its lowest August mean temperature since 1997
  • Rainfall of 88.2 mm at Cocos Islands Airport was 74% of the long-term August average
  • The Cocos (Keeling) Islands have been much warmer than usual so far this year
  • Christmas Island's temperatures were below average for much of August, with the mean maximum temperature for the month half a degree below average
  • There was only 16.0 mm of rainfall at Christmas Island Airport, about two-fifths of the August average
  • Rainfall on Christmas Island has been well below average so far this year

Australia's Pacific Ocean islands

  • Mild weather was common on Lord Howe Island, with the mean maximum temperature 0.6 °C above average and the mean minimum temperature 0.3 °C above average
  • Lord Howe Island Airport received 129.4 mm of rain for the month, somewhat above the August average
  • Lord Howe Island has been much drier and warmer than usual so far this year
  • On Norfolk Island, the mean maximum temperature was 0.6 °C above average and the mean minimum temperature 0.5 °C above average
  • Norfolk Island Airport had a minimum temperature of 18.9 °C on the morning of the 11th, its warmest August night (highest daily minimum temperature) on record
  • Only 51.8 mm of rain was recorded at Norfolk Island Airport, only two-fifths of the long-term average
  • Norfolk Island has been drier and much warmer than usual so far this year

Australia's Antarctic and sub-Antarctic territories

  • Temperatures were well above average at Mawson, going above -10 °C on thirteen days, well above the August average of about five days
  • At Davis, temperatures were more than three degrees warmer than average for August, with sixteen days above -10 °C compared to an average of about nine days that warm
  • Casey was warmer than average for most of the month, including a maximum of -2.9 °C on the 4th, but turned cold in the final week with a minimum of -28.7 °C on the 28th
  • Mawson and Casey have been warmer than usual so far this year, but the mean temperature at Davis is close to the long-term average
  • Macquarie Island was colder than usual, with a mean maximum temperature 0.5 °C below average and a mean minimum temperature 1.1 °C below average
  • Total precipitation of 113.8 mm on Macquarie Island was more than 50% above the long-term average
  • Macquarie Island has been much wetter and warmer than usual so far this year

Further information

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Lowest August mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
August
Cocos Island Airport 27.4 27.1 in 1997 28.0



Record highest August daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Norfolk Island Aero 18.9 on the 11th 18.3 on the 27th in 1971 81 13.2



Lowest August mean temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
August
Cocos Island Airport 25.5 25.2 in 1997 26.0



Summary statistics for August 2019
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Precipitation
(millimetres)
Mean for
August
2019
Diff
from
average
Highest for
August
2019
Mean for
August
2019
Diff
from
average
Lowest for
August
2019
Total for
August
2019
Average
for
August
Rank of
August
2019
Fraction of
August
average
Offshore Islands (district 200)
Christmas Island Aero 25.6 -0.5 26.6 3rd 21.9 -0.3 19.9 12th 16.0 41.2 average 39%
Cocos Island Airport 27.4 -0.6 28.7 29th 23.5 -0.4 20.9 7th 88.2 119.2 average 74%
Lord Howe Island Aero 19.6 +0.6 21.9 17th 13.8 +0.3 9.6 16th 129.4 110.4 average 117%
Norfolk Island Aero 18.9 +0.6 20.6 10th 13.7 +0.5 11.2 7th 51.8 125.3 v low 41%
Antarctica and Macquarie Island (district 300)
Casey -10.8 0.0 -2.9 4th -17.5 +1.1 -28.7 28th 9.9 19.5 low 51%
Davis -10.8 +3.3 -5.2 4th -17.7 +3.1 -32.6 17th 5.0 6.8 average 74%
Macquarie Island 4.6 -0.5 6.7 18th 0.5 -1.1 -3.4 4th 113.8 74.9 v high 152%
Mawson -13.1 +2.3 -7.3 22nd -20.3 +1.3 -29.6 16th
Note: Precipitation values from Casey and Davis should be used with caution.

Daily maximum temperatures for August 2019
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero26.126.026.625.725.925.225.925.525.925.525.224.424.425.825.625.525.324.925.025.625.425.826.126.025.825.125.526.125.926.326.5
Cocos Island Airport28.428.128.128.127.826.026.626.326.827.727.626.827.726.627.826.926.727.327.726.628.027.627.026.626.927.528.428.727.828.5
Lord Howe Island Aero19.619.418.719.418.820.120.919.421.118.218.018.218.319.118.720.921.918.720.918.919.719.817.619.321.019.920.120.720.520.119.6
Norfolk Island Aero17.618.917.719.118.418.119.120.020.320.620.520.219.419.518.217.519.319.418.819.219.219.717.117.816.418.618.719.019.320.118.3
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey-14.5-8.0-4.9-2.9-6.9-5.3-7.9-4.5-5.0-8.8-5.0-4.8-7.1-10.3-5.5-6.6-7.4-7.3-7.7-5.9-8.5-13.6-15.6-16.4-21.9-22.5-23.6-20.4-19.0-17.1-18.7
Davis-19.5-12.0-6.5-5.2-6.1-5.7-7.4-9.9-11.9-8.5-7.7-11.3-14.6-13.7-17.8-21.1-9.7-8.0-7.5-6.9-6.9-5.8-6.2-8.3-13.0-17.5-15.7-12.7-11.4-13.0-12.8
Macquarie Island4.96.71.22.64.35.45.60.71.43.73.82.95.25.62.45.26.46.76.52.83.74.36.24.65.35.96.34.45.05.76.5
Mawson-14.6-14.8-16.4-9.4-9.3-8.0-7.8-8.8-12.6-18.2-15.0-12.6-16.8-23.9-24.7-19.4-18.0-17.4-8.3-8.7-8.4-7.3-8.8-9.9-12.8-13.0-17.6-13.3-10.7-9.1-9.8
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 August 2019
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero22.422.622.922.821.420.520.722.322.221.421.319.920.521.222.522.522.521.121.422.122.122.422.822.321.722.021.622.122.022.422.3
Cocos Island Airport25.225.025.325.724.621.420.922.422.124.222.122.624.022.422.623.723.023.223.822.923.722.924.424.223.422.623.923.824.424.524.1
Lord Howe Island Aero13.813.811.415.612.010.914.713.213.215.911.512.213.914.914.99.617.812.115.412.615.115.312.113.913.915.214.213.914.014.315.6
Norfolk Island Aero13.913.613.414.314.412.311.214.615.813.918.916.316.114.812.412.611.712.314.012.414.014.212.911.313.413.512.212.911.913.815.6
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey-20.8-20.5-21.0-12.3-8.1-11.1-11.7-16.1-15.3-9.7-17.4-13.7-9.6-13.1-18.8-17.6-11.9-12.7-13.6-12.0-10.8-19.1-17.6-23.2-24.6-28.5-28.6-28.7-26.7-25.1-23.7
Davis-27.1-27.5-22.8-12.6-9.6-11.2-8.7-10.2-13.2-15.8-15.2-24.6-22.9-17.9-20.4-21.4-32.6-31.8-10.3-10.3-12.3-14.5-10.1-9.5-15.8-20.8-21.1-21.4-20.8-15.6-19.9
Macquarie Island4.01.3-1.0-3.4-1.71.53.00.3-1.7-1.21.1-2.7-2.8-2.41.6-0.40.55.05.82.6-1.30.90.50.1-0.11.32.52.7-2.2-1.73.3
Mawson-28.4-19.8-21.4-21.1-19.0-11.8-12.2-10.2-14.2-24.0-24.9-22.9-20.3-26.5-29.1-29.6-28.9-26.3-25.7-19.9-17.1-14.9-14.8-16.4-16.1-20.8-23.4-20.5-14.5-13.4
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 August 2019
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero - - - - 0.4 0.4 2.8 - - 2.8 2.0 3.0 0.2 - - - 1.2 3.0 - - - - - - - 0.2 - -
Cocos Island Airport - - - - - 6.4 6.4 3.8 10.6 - 4.0 14.6 0.2 9.8 2.2 2.0 18.8 - 1.0 1.8
0.2 0.2 0.8 2.4 2.8 - -
- 0.2
Lord Howe Island (Milky Way) 3.8 1.0 2.0 - 1.8 - 0.2 1.8 17.2 - 11.0 4.8 - - - - - - - 4.4 1.2 7.4 10.4 1.4 - 3.4 - 32.8 6.4 5.4 5.2
Lord Howe Island Aero 3.2 0.6 2.2 0.8 1.4 - 1.0 1.8 30.4 0.2 8.6 6.6 0.4 - - - - - - 2.6 1.8 5.2 10.4 0.4 - 1.4 0.2 33.2 9.8 4.6 2.6
Norfolk Island Aero 0.6 1.0 0.4 0.6 0.4 1.8 - 5.8 1.2 4.0 - 0.6 - - 1.0 1.2 - 3.2 0.2 - 6.0 5.0 10.0 1.8 - - 2.8 0.8 - - 3.4
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey - - 2.0 3.0


- - - -
2.1 - - 0.8 2.0 - -
- - - - - - - - - - -
Davis - - - - -

- - - 0.4 3.2 - - - 0.8 - -
- - - - - - - - - 0.6 - -
Macquarie Island 0.8 0.2 4.4 1.4 4.6 5.8 2.6 0.8 - - 0.4 2.8 3.2 1.0 4.0 18.6 1.0 0.6 7.6 6.2 3.4 10.0 0.6 9.4 1.0 3.6 5.0 4.4 2.6 3.6 4.2
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 Monday 2 September 2019. 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