Remote Islands and Antarctica in September 2018

Australia's Indian Ocean islands

Australia's Pacific Ocean islands

  • Both maximum and minimum temperatures were below average on Lord Howe Island
  • Lord Howe Island recorded 81.4 mm of rain which is 72% of average and double what was recorded in record dry September 2017
  • Temperatures were close to average on Norfolk Island
  • Norfolk Island Aero recorded 28.6 mm of rain which is only 31% of average and much drier than last September

Australia's Antarctic and sub-Antarctic territories

  • Temperatures were below average at Australia's Antarctic sites, especially at Casey where maximum temperatures were 2.7 °C below average and minimum temperatures 4.2 °C below average; Mawson and Davis were both slightly colder than average
  • Casey's September mean maximum temperature was the lowest since 1998, its September mean minimum temperature the lowest on record, and it's overall September mean temperature its lowest since 1998
  • Temperatures at Macquarie Island were close to a degree above average
  • On the 16th, Macquarie Island recorded its highest September daily precipitation on record with 38.4 mm recorded by the manual gauge; this breaks the record set last September when the manual gauge recorded 27.2 mm
  • Overall, total precipitation on Macquarie Island was 154% of average with 116.2 mm recorded

Further information

Media
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Record highest September daily precipitation
New record
(mm)
Old
record
Years of
record
Macquarie Island 38.4 on the 16th 27.2 on the 19th in 2017 71



Lowest September total precipitation for at least 20 years
Observed
(mm)
Most recent
lower
Average for
September
Cocos Island Airport 12.8 2.8 in 1986 93.4



Record lowest September daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Christmas Island Aero 23.0 on the 6th = 23.0 on the 14th in 1975 45 26.3



Record lowest September mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Christmas Island Aero 24.9 25.2 in 1978 44 26.3

Lowest September mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
September
Casey -12.5 -13.3 in 1998 -9.8



Record lowest September mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Christmas Island Aero 20.8 21.1 in 1982 44 22.3
Casey -21.4 -21.1 in 1998 29 -17.2



Record lowest September mean temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Christmas Island Aero 22.9 23.4 in 1977 44 24.3

Lowest September mean temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
September
Casey -17.0 -17.2 in 1998 -13.5



Summary statistics for September 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Precipitation
(millimetres)
Mean for
September
2018
Diff
from
average
Highest for
September
2018
Mean for
September
2018
Diff
from
average
Lowest for
September
2018
Total for
September
2018
Average
for
September
Rank of
September
2018
Fraction of
September
average
Offshore Islands (district 200)
Christmas Island Aero 24.9 -1.4 25.7 25th 20.8 -1.5 18.6 14th 22.6 55.7 average 41%
Cocos Island Airport 27.9 -0.3 28.7 25th 24.0 +0.1 21.5 5th 12.8 93.4 v low 14%
Lord Howe Island Aero 19.6 -0.4 22.5 29th 14.5 -0.1 9.1 26th 81.4 113.6 low 72%
Norfolk Island Aero 19.0 -0.1 20.9 17th 13.6 -0.2 9.8 27th 28.6 92.8 v low 31%
Antarctica and Macquarie Island (district 300)
Casey -12.5 -2.7 -3.4 12th -21.4 -4.2 -33.5 24th 25.6 17.4 high 147%
Davis -13.1 -0.3 -5.4 25th -20.0 -0.2 -29.2 7th 3.4 5.3 average 64%
Macquarie Island 6.3 +0.9 7.6 30th 2.6 +1.0 -3.5 26th 116.2 75.7 v high 154%
Mawson -14.6 -0.4 -7.0 21st -20.7 -0.2 -28.3 7th
Note: Precipitation values from Casey and Davis should be used with caution.

Daily maximum temperatures for September 2018
Offshore Islands (200)123456789101112131415161718192021222324252627282930
Christmas Island Aero24.725.125.325.424.723.025.124.524.325.324.525.425.425.024.925.724.524.824.525.124.525.425.324.825.725.225.2
Cocos Island Airport27.527.527.627.126.427.427.628.128.028.428.028.227.928.127.127.828.228.128.227.927.828.328.028.428.728.328.5
Lord Howe Island Aero19.920.017.217.918.518.920.120.419.618.719.419.420.820.621.821.618.118.719.920.218.619.219.919.817.418.419.721.022.519.8
Norfolk Island Aero19.720.718.517.618.017.718.117.818.818.918.219.519.820.519.820.720.919.318.318.519.818.419.219.018.017.618.118.919.419.8
Antarctica and Macquarie Island (300)123456789101112131415161718192021222324252627282930
Casey-23.0-21.3-20.4-17.4-10.2-9.4-6.4-5.5-5.3-6.4-6.4-3.4-5.2-6.7-8.4-12.2-15.1-15.6-16.7-17.0-20.8-20.2-21.4-11.0-11.9-15.8-8.2-9.9-11.1
Davis-12.7-17.1-18.9-18.7-17.8-20.8-15.3-13.2-23.2-18.4-14.8-11.8-15.5-9.5-7.1-7.6-6.2-8.6-10.0-17.4-13.6-15.8-8.8-7.5-5.4-6.7-6.1-14.8-15.2
Macquarie Island6.05.76.16.76.46.96.66.47.06.66.86.76.56.76.56.26.76.16.36.16.65.44.54.84.15.97.07.26.77.6
Mawson-10.4-14.9-17.2-17.0-17.5-21.2-18.0-19.2-20.4-21.6-22.2-18.0-15.7-17.1-14.0-10.2-10.0-8.3-12.7-9.0-7.0-12.7-13.7-12.8-12.4-8.3-10.2-14.8-16.7
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 September 2018
Offshore Islands (200)123456789101112131415161718192021222324252627282930
Christmas Island Aero21.121.121.220.020.120.320.420.420.221.221.521.120.318.620.520.421.121.121.021.221.621.621.421.320.821.020.920.9
Cocos Island Airport23.423.922.823.021.522.724.724.724.724.424.824.123.422.922.424.624.824.524.224.324.724.624.324.624.824.824.7
Lord Howe Island Aero15.015.614.712.813.913.315.717.114.913.415.512.715.916.017.318.413.414.216.017.113.815.312.113.012.89.19.713.916.415.2
Norfolk Island Aero14.513.914.512.611.912.712.313.511.614.612.913.915.115.216.015.017.815.614.115.213.213.614.313.613.311.19.812.112.111.9
Antarctica and Macquarie Island (300)123456789101112131415161718192021222324252627282930
Casey-29.2-28.2-30.8-28.4-27.6-18.7-15.6-19.7-17.0-14.5-18.5-17.2-12.1-10.8-12.0-22.6-20.2-21.0-22.5-23.0-25.0-26.4-25.7-33.5-22.5-22.3-24.5-18.7-15.4-17.3
Davis-15.2-21.8-24.7-23.7-22.6-26.1-29.2-25.8-26.5-27.4-26.1-23.9-20.2-20.1-16.2-10.8-10.5-10.9-16.0-20.9-23.4-22.6-24.5-22.0-10.3-9.6-10.0-16.5-19.5-24.1
Macquarie Island5.6-1.1-0.52.55.45.55.45.44.54.72.43.43.43.54.70.3-0.44.72.81.71.83.51.6-0.5-2.7-3.52.75.32.33.2
Mawson-14.9-17.2-21.5-20.9-22.2-24.6-28.3-28.2-27.6-26.7-27.2-26.8-26.5-18.3-20.6-18.8-15.7-15.0-19.3-19.2-16.8-15.6-18.2-18.5-18.9-18.3-13.1-18.7-21.1-23.7
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 September 2018
Offshore Islands (200)123456789101112131415161718192021222324252627282930
Christmas Island Aero - - - 0.2 0.4 4.6 3.6 13.2 0.4 - - - - - - - - - 0.2 - - - - - - - - - - -
Cocos Island Airport - - 0.4 0.2 8.4 2.2 0.4 - - -

- 0.2 - 0.6 0.2 0.2 - - - - - - - - - -

Lord Howe Island (Milky Way) 8.0 - 2.0 0.4 - 3.0 - - 27.0 3.0 - - - - - - 8.2 0.6 - 0.8 0.6 0.2 - - - 0.2 6.0 2.6 0.8 16.6
Lord Howe Island Aero 8.2 - - 1.4 2.8 0.8 - - 19.6 3.2 0.2 - - - - - 6.6 1.0 - 0.2 8.0 0.2 - - 0.2 0.4 8.4 0.4 2.8 17.0
Norfolk Island Aero - 8.2 - - 0.4 1.0 3.8 0.2 0.2 5.6 1.8 0.6 1.6 - - - - 1.4 - - - 0.8 0.2 - 0.4 0.6 1.8 - - -
Antarctica and Macquarie Island (300)123456789101112131415161718192021222324252627282930
Casey - - - 1.0 - - - - 0.2 2.6 1.2 - - 6.2 2.2 - - - - - - 0.4 - - 11.2 - - 0.4 0.2 -
Davis
- - - 0.4 - - - - - - - - 0.2 - 0.8 0.2 - - - - - - 0.4 0.6 0.6 - - 0.2 -
Macquarie Island 2.2 4.0 1.2 0.2 0.4 0.6 0.2 1.4 2.2 1.6 2.2 2.8 6.0 5.0 4.4 28.6 13.0 10.0 0.4 0.8 2.8 5.4 3.2 1.4 2.2 1.6 0.4 1.2 1.4 7.8
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 9 am on Monday 1 October 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