Remote Islands and Antarctica in August 2018

Australia's Indian Ocean islands

Australia's Pacific Ocean islands

  • Days on both Lord Howe Island and Norfolk Island were mostly warmer than average for August, with mean maximum temperatures 0.3 °C and 0.7 °C above average respectively
  • There were many cooler than average nights on Lord Howe Island, giving a mean minimum temperature 0.7 °C below the August average
  • Lore Howe Island recorded 65.4 mm of rain, 60 % of the August average
  • Norfolk Island recorded 54.0 mm of rain, 43 % of the August average

Australia's Antarctic and sub-Antarctic territories

  • It was an exceptionally warm August at Mawson and Davis, broadly consistent with the Southern Annular Mode being negative
  • Mawson recorded its highest August mean daily maximum temperature, mean daily minimum temperature and mean temperature on record
  • Mawson's mean temperature was 5.8 °C above the long-term average, and 1.2  °C above the previous record from 1996
  • Davis recorded its highest August mean daily maximum temperature since 1981, and its highest August mean daily minimum temperature and overall August mean temperature since 1998
  • Davis' mean temperature was 4.8 °C above the long-term average
  • This continues a spell of relatively mild weather that began in the middle of July
  • Temperatures at Casey were almost five degrees below average, with cold weather dominant up to the 19th and again at the end of the month
  • Macquarie Island had a string of relatively mild weather in the first half of the month, with the mean for the month a degree above average
  • Rainfall on Macquarie Island was close to average with 59.8 mm

Further information

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Record highest August mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Mawson -10.2 -10.7 in 1996 64 -15.5

Highest August mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
August
Davis -9.6 -9.3 in 1981 -14.2



Lowest August mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
August
Christmas Island Aero 25.0 =25.0 in 1997 26.1
Cocos Island Airport 27.5 27.1 in 1997 28.1



Record highest August mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Mawson -15.3 -17.2 in 1996 64 -21.7

Highest August mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
August
Davis -15.7 =-15.7 in 1998 -20.8



Record lowest August mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Christmas Island Aero 20.8 = 20.8 in 1997 43 22.2



Record highest August mean temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Mawson -12.8 -14.0 in 1996 64 -18.6

Highest August mean temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
August
Davis -12.7 =-12.7 in 1998 -17.5



Record lowest August mean temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Christmas Island Aero 22.9 = 22.9 in 1997 43 24.2



Summary statistics for August 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Precipitation
(millimetres)
Mean for
August
2018
Diff
from
average
Highest for
August
2018
Mean for
August
2018
Diff
from
average
Lowest for
August
2018
Total for
August
2018
Average
for
August
Rank of
August
2018
Fraction of
August
average
Offshore Islands (district 200)
Christmas Island Aero 25.0 -1.1 25.7 15th 20.8 -1.4 18.4 4th 20.8 41.7 average 50%
Cocos Island Airport 27.5 -0.6 28.6 26th 23.8 -0.1 22.0 7th 59.0 119.4 low 49%
Lord Howe Island Aero 19.3 +0.3 21.9 6th 12.8 -0.7 8.1 3rd 65.4 109.7 low 60%
Norfolk Island Aero 19.0 +0.7 20.8 19th 13.5 +0.3 11.7 27th 54.0 125.8 v low 43%
Antarctica and Macquarie Island (district 300)
Casey -15.5 -4.9 -4.4 20th -23.2 -4.8 -33.0 28th 10.8 20.0 low 54%
Davis -9.6 +4.6 -2.3 6th -15.7 +5.1 -26.2 30th 0.2 6.7 v low 3%
Macquarie Island 5.9 +0.8 8.2 10th 2.8 +1.2 -1.4 20th 59.8 74.3 average 80%
Mawson -10.2 +5.3 -5.2 5th -15.3 +6.4 -24.7 29th
Note: Precipitation values from Casey and Davis should be used with caution.

Daily maximum temperatures for August 2018
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero25.624.124.024.524.924.924.225.525.525.124.725.724.825.525.725.124.824.624.925.425.225.524.625.225.425.524.624.824.825.1
Cocos Island Airport27.427.727.427.227.327.327.327.227.627.427.427.728.327.228.027.726.327.527.627.727.327.827.727.727.828.628.327.827.226.927.1
Lord Howe Island Aero20.319.319.520.219.521.919.519.120.119.820.321.118.018.720.121.619.920.118.815.918.118.417.518.418.819.620.317.617.918.120.2
Norfolk Island Aero18.919.218.917.919.519.419.618.118.618.418.118.519.219.219.820.020.819.320.817.817.719.418.718.318.117.818.820.619.219.219.2
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey-17.6-13.5-15.0-18.9-17.9-17.9-19.7-14.1-10.7-9.9-14.1-13.7-16.4-19.9-22.1-18.5-19.3-10.8-4.5-4.4-8.2-10.5-9.7-11.3-16.3-19.3-22.2-17.9-19.5-24.3-21.8
Davis-9.4-15.2-5.5-5.5-3.8-2.3-7.3-13.5-3.7-4.3-4.0-10.8-9.9-9.4-12.4-10.4-8.7-6.5-5.8-5.8-8.6-8.5-13.6-13.6-15.4-19.2-11.8-16.0-21.4-8.5-8.2
Macquarie Island6.35.36.45.86.06.67.06.76.98.26.37.35.67.07.55.35.33.02.72.33.65.76.55.96.64.25.36.46.76.46.8
Mawson-6.4-11.5-8.3-6.5-5.2-7.0-7.5-8.7-10.7-7.1-6.5-9.3-8.4-8.6-11.7-11.5-11.0-8.6-8.4-8.7-8.5-11.8-12.2-13.1-15.7-16.0-14.4-14.8-14.3-12.8-11.6
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 August 2018
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero21.319.819.218.420.919.621.220.621.521.020.421.121.821.721.521.320.820.621.021.221.021.021.520.920.920.821.120.920.120.2
Cocos Island Airport23.624.123.023.522.523.022.024.724.723.223.723.824.923.623.324.723.222.724.724.724.523.624.724.524.024.725.125.023.522.322.3
Lord Howe Island Aero8.815.18.113.414.89.813.815.58.29.39.716.613.214.215.617.210.613.413.99.810.813.213.010.013.313.915.014.812.813.914.9
Norfolk Island Aero14.513.513.713.012.414.812.714.512.913.413.313.211.814.614.813.016.914.313.714.012.313.214.313.912.712.111.715.313.612.512.3
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey-23.6-23.6-20.4-23.6-24.3-23.5-24.7-27.9-24.2-21.4-18.6-18.2-22.0-24.3-26.8-28.1-24.1-24.3-22.3-13.0-13.4-14.0-19.9-17.8-20.1-26.7-26.8-33.0-26.0-32.5-31.3
Davis-12.2-19.0-18.4-18.5-9.0-8.4-8.0-14.5-17.4-14.4-6.1-12.2-14.3-14.1-13.8-15.5-13.4-13.5-10.1-9.6-9.3-13.7-16.9-20.5-20.5-21.1-26.0-23.1-22.5-26.2-24.9
Macquarie Island3.71.42.95.05.25.35.35.85.54.24.54.53.42.44.14.6-0.41.0-0.2-1.4-1.2-0.53.23.60.90.7-0.5-0.94.85.65.5
Mawson-10.5-13.6-18.0-15.6-11.1-11.0-8.6-9.7-14.7-15.2-10.8-9.5-13.5-13.5-12.4-14.4-14.5-19.2-18.5-16.0-15.0-15.1-16.0-15.3-16.0-22.8-22.8-17.2-24.7-24.2-16.1
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 2018
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero - 10.0 3.6 0.2 0.2 - - 0.2 - - 5.0 - 0.2 - - - - - - - - - - - 1.0 - - - - 0.4
Cocos Island Airport 3.8 4.6 0.4 - 8.4 - 0.8 0.2 - 1.8 1.0 8.6 - - 4.6 - 3.4 13.6 - - - - 0.2 - - - - - 0.4 3.2 4.0
Lord Howe Island (Milky Way) - 0.4 0.4 - 1.2 - 8.0 1.0 - 0.2 - - 14.0 1.0 1.6 - - - 4.4 7.2 6.4 1.0 1.4 0.8 0.6 0.4 7.2 2.4 0.4 1.0
Lord Howe Island Aero 1.4 8.0 - - 1.2 - 9.0 0.2 - - - - 12.4 2.2 - 0.2 - - 4.0 7.2 4.2 0.8 1.0 0.8 - 0.4 10.4 0.6 0.2 1.2 -
Norfolk Island Aero - - - - - 2.2 0.2 - 3.0 0.2 - - - 1.4 - 0.4 - 5.4 0.2 5.0 6.4 0.6 2.0 - - 0.2 - 21.8 - - 5.0
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey - - - - - - - - 0.8 - - - - - - - - - - - 7.0 1.4 - 0.8 0.2 - - - 0.6 - -
Davis - - -
-
- - - - - - - - - 0.2 - - - - - - - - - - -

- -
Macquarie Island 0.4 0.6 0.2 0.4 0.2 1.6 2.6 2.6 3.0 1.8 2.0 1.2 1.6 1.2 7.0 4.6 1.8 8.4 - 0.4 1.0 - 0.2 3.4 4.6 2.0 5.0 0.6 0.4 - 1.0
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 3 September 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