Remote Islands and Antarctica in August 2020

Australia's Indian Ocean islands: warm days and nights

Australia's Pacific Ocean islands: some warm days and nights

  • Rainfall was below average at Lord Howe Island Aero, receiving just 59% of its August average rainfall.
  • Norfolk Island Aero was slightly drier than average for the month, receiving 93% of its August average rainfall.
  • Both daytime and night-time temperatures in August were warmer than average at Lord Howe Island and Norfolk Island.
  • Lord Howe Island Aero equalled its highest August mean daily maximum temperature on record.

Australia's Antarctic and sub-Antarctic territories: severe winds at Mawson and Davis, wet at Macquarie Island

  • The month began with maximum wind gusts of 172 km/h at Davis and 157 km/h at Mawson on the 1st.
  • There were even stronger winds on the 9th, but the strongest gust was 206 km/h at Mawson on the morning of the 30th, the site's strongest in August since 2004.
  • Total wind run for August was above average at Mawson and Davis, but slightly below average at Casey.
  • Both mean maximum and mean minimum temperatures were several degrees above average at Mawson and Davis, but below average at Casey.
  • The coldest recorded temperature was -31.8 °C at Casey on the 24th.
  • Macquarie island had several cold days, with maximum temperatures just above zero, contributing to a cooler than average month for both maximum and minimum temperatures.
  • Precipitation at Macquarie Island was above average, 137% of the August average.
  • On the 19th, Macquarie Island recorded 27.0 mm, its highest August daily precipitation on record.

Further information

Media
(03) 9669 4057

Record highest August daily precipitation
New record
(mm)
Old
record
Years of
record
Macquarie Island 27.0 on the 19th 26.7 on the 2nd in 1968 73



Highest August total precipitation for at least 20 years
Observed
(mm)
Most recent
higher
Average for
August
Cocos Island Airport 289.4 349.2 in 1996* 120.9

* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported




Record highest August temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Cocos Island Airport 30.6 on the 14th 30.3 on the 28th in 2010 69 28.0



Record highest August mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Lord Howe Island Aero 19.8 = 19.8 in 2013 31 19.0



Highest August mean temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
August
Cocos Island Airport 26.9 27.3 in 1999 26.0



Summary statistics for August 2020
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Precipitation
(millimetres)
Mean for
August
2020
Diff
from
average
Highest for
August
2020
Mean for
August
2020
Diff
from
average
Lowest for
August
2020
Total for
August
2020
Average
for
August
Rank of
August
2020
Fraction of
August
average
Offshore Islands (district 200)
Christmas Island Aero 26.4 +0.3 27.1 28th 22.9 +0.7 21.0 10th 28.6 40.9 average 70%
Cocos Island Airport 28.7 +0.7 30.6 14th 25.1 +1.2 22.8 20th 289.4 120.9 v high 239%
Lord Howe Island Aero 19.8 +0.8 22.1 19th 13.7 +0.2 7.9 28th 64.8 109.2 low 59%
Norfolk Island Aero 18.9 +0.6 21.4 20th 14.2 +0.9 10.2 28th 116.2 125.2 average 93%
Antarctica and Macquarie Island (district 300)
Casey -12.6 -1.8 -4.2 20th -21.5 -3.0 -31.8 24th 16.1 19.8 average 81%
Davis -10.4 +3.6 -3.2 19th -17.7 +3.0 -28.1 23rd 2.4 6.7 low 36%
Macquarie Island 4.6 -0.5 7.0 2nd 0.7 -0.9 -3.5 13th 127.2 75.5 v high 168%
Mawson -10.8 +4.6 -4.9 24th -17.6 +4.0 -25.0 7th
Note: Precipitation values from Casey and Davis should be used with caution.

Daily maximum temperatures for August 2020
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero26.225.726.226.526.825.326.226.527.026.526.726.625.326.326.526.825.125.826.726.625.826.926.826.926.926.726.827.126.427.026.8
Cocos Island Airport28.829.029.229.429.830.330.327.928.127.529.529.829.930.629.129.329.329.025.724.927.129.028.928.828.428.328.628.428.428.828.7
Lord Howe Island Aero18.918.318.920.522.119.419.519.320.519.519.819.520.021.421.620.620.421.222.120.619.919.618.017.618.317.818.720.018.520.521.6
Norfolk Island Aero17.618.718.918.919.820.119.518.218.819.319.218.417.618.218.118.419.419.019.821.420.120.619.120.119.117.817.518.018.018.319.5
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey-11.0-10.8-5.4-8.0-6.4-5.5-10.2-20.0-23.3-20.8-8.3-6.2-8.4-9.8-13.3-10.7-10.0-11.0-9.9-4.2-8.4-11.5-25.2-22.3-9.6-12.5-16.0-19.3-21.3-16.7-14.7
Davis-6.2-8.8-11.6-10.7-10.2-17.1-8.1-8.8-7.7-12.1-5.7-7.8-12.8-15.3-7.7-5.2-4.1-5.7-3.2-3.8-8.9-16.8-16.9-20.5-11.9-12.8-14.7-16.7-13.2-6.9-10.4
Macquarie Island6.67.05.13.74.64.04.85.42.63.12.70.14.75.05.35.26.36.92.73.00.54.04.85.56.05.46.26.14.54.95.1
Mawson-10.4-12.9-11.3-7.2-11.3-14.6-13.2-12.3-6.1-5.0-8.9-7.2-8.5-12.0-19.8-14.2-10.9-6.4-7.3-7.7-11.3-10.6-6.7-4.9-16.6-15.9-15.1-13.4-13.8-10.4-9.5
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 2020
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero22.222.222.322.922.423.221.822.922.121.023.123.223.723.123.423.222.922.222.923.123.523.523.323.023.423.523.423.122.523.223.0
Cocos Island Airport24.225.625.623.824.626.325.925.524.024.123.925.326.126.225.925.025.924.423.522.823.323.425.826.525.724.425.425.425.926.226.1
Lord Howe Island Aero14.815.614.714.416.115.016.210.315.312.69.614.413.812.413.714.511.516.817.118.915.313.911.811.213.311.09.27.912.814.115.0
Norfolk Island Aero15.314.116.215.613.415.313.315.012.013.714.214.111.712.312.213.415.914.215.617.316.716.016.715.414.214.613.610.212.213.214.1
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey-28.1-27.1-17.0-15.0-12.2-12.0-12.3-21.8-29.6-30.2-26.5-22.7-13.2-14.4-18.3-18.8-20.9-15.6-18.1-17.9-13.6-13.9-27.9-31.8-30.4-28.8-24.6-26.4-26.9-27.2-24.6
Davis-14.0-10.3-13.2-15.3-15.9-17.2-24.7-18.7-12.7-20.9-23.6-13.5-14.6-21.5-24.1-16.5-9.1-9.0-9.4-7.8-12.6-24.1-28.1-25.2-26.4-24.4-20.4-21.6-21.3-19.8-14.1
Macquarie Island3.85.03.2-0.30.42.81.11.3-0.1-1.1-1.7-3.0-3.50.02.82.82.63.5-1.2-0.5-1.5-1.70.41.51.21.40.02.40.51.4-1.3
Mawson-17.5-13.7-21.9-16.3-15.4-24.6-25.0-17.9-14.1-13.7-18.4-18.4-11.3-15.5-21.7-23.4-22.0-18.7-12.5-12.5-14.2-16.2-17.8-12.9-18.2-24.5-22.9-17.1-15.9-16.1-16.3
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 August 2020
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero 0.4 11.0 0.4 1.0 6.4 - - - - - 0.6 0.2 - - - 6.4 1.4 0.2 - - - - - - 0.6 - -
Cocos Island Airport 1.6 0.2 - - 3.8 0.2 - - 16.4 0.4 14.2 4.6 1.2 - - 0.4 - 5.4 20.8 56.2 158 2.4 2.4 - - 1.4 0.2 - - - -
Lord Howe Island (Milky Way) 0.2 - - - - - - 1.8 15.0 2.6 4.4 1.8 0.6 0.6 9.0 50.4 4.0 - 2.4 - 0.8 3.6 9.0 9.2 - 0.2 - 0.4 6.6 0.2 0.2
Lord Howe Island Aero 0.4 - - - 0.2 - - 1.0 17.4 2.4 4.8 3.8 1.0 0.6 7.0

-
- 1.0 2.0 6.2 8.4 1.6 0.6 - 0.2 6.2 - -
Norfolk Island Aero 8.4 0.8 0.6 - 1.0 1.4 - - 0.2 6.2 17.0 1.4 - - - - 44.8 7.2 - - 11.6 - - 1.2 6.4 - - 0.4 5.8 1.8 -
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey 0.2 1.0 3.4 0.8 0.4 0.4 0.8 - - - - - - - 0.6 - - - - 0.8 1.9 5.8 - - - - - - - - -
Davis -

- 0.4 0.4 - - - - 0.2 1.2 - - - -

- - - 0.2 - - - - - - - -
Macquarie Island 1.8 17.0 5.4 0.8 1.0 1.8 2.0 4.8 2.2 3.0 5.0 1.0 0.4 0.4 1.8 - 0.6 6.0 27.0 11.8 2.2 0.4 0.2 1.8 - 2.6 1.2 4.2 14.6 4.4 1.8
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 2 pm on Tuesday 1 September 2020. 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

Climate