Remote Islands and Antarctica in June 2020

Australia's Indian Ocean islands: drier than average

  • June began with a wet day on Christmas Island, but it ended up being a drier than average month, with no recorded rainfall for the second half of the month
  • Rainfall was also very much below average at Cocos Island Airport, recording less than 20% of its June average and likely its driest June for more than 20 years (noting that an estimated 3 mm fell during power outages at the Airport, resulting some days of missing rainfall in the real-time reporting)
  • Daytime temperatures were close to average at both Christmas Island Aero and Cocos Island Airport
  • Night-time temperatures were warmer than average during most of the month

Australia's Pacific Ocean islands: drier than average at Norfolk

  • At Norfolk Island Aero, light rainfall was recorded on most days during the month, however the total for June was less than half of average
  • Rainfall for June was close to average at Lord Howe Island Aero, with heavy rain at times and four days recording more than 20 mm
  • Both daytime and night-time temperatures were generally close to average at both Lord Howe Island Aero and Norfolk Island Aero

Australia's Antarctic and sub-Antarctic territories: cold at Casey, record warm end to the month at Macca

  • Casey had cooler than average maximum and minimum temperatures throughout the first half of the month
  • Casey recorded a minimum temperature of -30.6 °C on the 19th, the site's coldest temperature in June since -31.1 °C on 17 June 2016
  • At Mawson and Davis, maximum and minimum temperatures were generally above average, apart from a cooler than average week through the middle of the month
  • Precipitation at Macquarie Island was close to average, with precipitation recorded on most days during June
  • On the 30th, Macquarie Island recorded a maximum temperature of 10.6 °C, its highest June temperature on record and highest for any month between May and October
  • Mean maximum and mean minimum temperatures at Macquarie Island were both slightly warmer than average for June

Further information

Media
(03) 9669 4057

Record highest June temperature
New record
(°C)
Old
record
Years of
record
Average for
June
Macquarie Island 10.6 on the 30th 8.7 on the 20th in 1974 73 5.1



Summary statistics for June 2020
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Precipitation
(millimetres)
Mean for
June
2020
Diff
from
average
Highest for
June
2020
Mean for
June
2020
Diff
from
average
Lowest for
June
2020
Total for
June
2020
Average
for
June
Rank of
June
2020
Fraction of
June
average
Offshore Islands (district 200)
Christmas Island Aero 27.0 0.0 27.8 4th 23.8 +0.5 21.5 2nd 77.8 174.2 average 45%
Cocos Island Airport 28.7 +0.1 29.5 23rd 25.5 +1.0 24.2 2nd 32.6 211.5 v low 15%
Lord Howe Island Aero 20.0 +0.1 22.9 1st 14.5 -0.3 8.9 7th 164.0 168.2 average 98%
Norfolk Island Aero 19.5 +0.2 21.5 4th 14.8 +0.1 11.8 29th 66.0 143.2 low 46%
Antarctica and Macquarie Island (district 300)
Casey -11.2 -0.5 -1.6 21st -19.7 -1.1 -30.6 19th 21.8 25.7 average 85%
Davis -11.0 +1.6 -4.1 5th -16.9 +2.0 -27.4 16th 9.2 9.1 average 101%
Macquarie Island 5.7 +0.6 10.6 30th 2.0 +0.4 -3.1 12th 82.8 77.5 average 107%
Mawson -12.5 +1.0 -6.8 9th -18.4 +1.2 -26.1 20th
Note: Precipitation values from Casey and Davis should be used with caution.

Daily maximum temperatures for June 2020
Offshore Islands (200)123456789101112131415161718192021222324252627282930
Christmas Island Aero27.226.927.427.827.527.227.126.827.127.626.926.727.026.926.727.427.127.027.526.626.826.727.126.126.827.727.227.226.2
Cocos Island Airport27.928.629.029.328.629.228.628.229.127.928.127.928.228.628.828.428.728.929.029.528.828.729.528.529.128.327.529.328.628.8
Lord Howe Island Aero22.920.420.917.719.219.820.617.719.920.221.721.722.222.221.221.221.018.617.919.717.919.419.819.118.618.8
Norfolk Island Aero20.521.521.021.518.518.619.219.419.418.819.720.420.320.620.819.818.920.217.118.419.119.518.819.719.220.419.718.318.518.0
Antarctica and Macquarie Island (300)123456789101112131415161718192021222324252627282930
Casey-13.8-21.3-16.5-19.8-14.2-14.8-17.1-17.5-22.3-8.2-7.7-16.8-13.0-14.0-18.0-10.4-20.8-5.5-1.6-1.8-1.6-5.1-12.2-4.4-3.5-3.2-4.0-5.5-11.7-8.4
Davis-14.7-13.9-10.3-6.8-4.1-4.7-8.4-7.1-6.9-10.4-9.2-8.2-12.9-20.1-21.2-21.3-21.4-16.9-12.1-6.6-5.1-9.9-7.3-8.0-6.4-9.7-13.7-8.8-10.5-13.4
Macquarie Island7.46.56.36.63.64.66.16.76.65.64.85.26.67.96.86.75.66.56.53.42.53.44.14.35.05.45.15.85.410.6
Mawson-20.5-15.9-13.1-12.2-8.3-15.8-12.1-7.8-6.8-11.6-14.7-14.6-13.6-17.8-14.5-12.5-16.1-19.5-22.6-7.9-7.1-9.5-9.2-9.7-8.4-8.8-9.7-12.5-10.7-11.5
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 June 2020
Offshore Islands (200)123456789101112131415161718192021222324252627282930
Christmas Island Aero22.521.522.523.525.024.422.224.324.124.323.723.623.923.823.924.624.324.224.224.023.724.024.223.924.123.923.723.524.1
Cocos Island Airport24.624.226.126.826.426.725.425.026.124.525.224.825.525.325.725.126.126.224.724.626.325.724.625.725.725.824.624.726.1
Lord Howe Island Aero16.118.213.813.814.610.08.914.213.816.818.217.419.517.218.010.610.716.513.613.611.912.811.614.716.916.411.815.4
Norfolk Island Aero16.814.117.516.413.914.412.712.814.215.614.515.115.716.016.517.816.015.613.713.414.413.113.115.015.715.616.514.311.812.3
Antarctica and Macquarie Island (300)123456789101112131415161718192021222324252627282930
Casey-18.6-22.5-25.7-23.5-27.8-22.2-24.4-26.8-26.6-27.1-28.0-18.6-21.5-21.7-22.9-22.3-22.1-28.9-30.6-7.0-8.3-6.6-14.3-18.2-17.8-8.1-8.6-9.1-14.3-17.7
Davis-17.5-17.3-22.9-16.3-16.1-7.8-9.3-10.2-12.6-12.7-13.8-13.7-13.6-21.2-25.5-27.4-24.3-26.8-24.1-20.1-19.7-10.6-16.6-15.8-11.6-11.8-14.0-21.2-16.1-16.3
Macquarie Island6.53.12.1-1.20.6-1.4-2.61.83.04.21.1-3.13.34.85.53.20.90.15.3-0.21.51.21.92.31.62.44.01.42.33.0
Mawson-23.5-24.2-22.3-17.8-16.0-18.1-20.3-19.5-12.6-12.5-16.8-19.4-18.9-21.3-21.6-21.4-18.0-22.0-25.6-26.1-23.2-16.5-16.6-12.3-12.1-10.2-12.4-16.2-18.8-14.6
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 June 2020
Offshore Islands (200)123456789101112131415161718192021222324252627282930
Christmas Island Aero 46.2 18.2 - 0.2 0.8 10.6 - - - 0.8 1.0 - - - - - - - - - - - -
Cocos Island Airport 0.4
0.4 0.2 - -
0.2 - 2.6

0.2

0.6

6.4 1.2 - - - 0.2 0.4 0.8 3.6 15.4
-
Lord Howe Island (Milky Way) 6.8 3.4 3.0 0.8 0.4 0.4 - 2.6 21.8 1.4 - 7.2 - 30.8 26.4 - - 1.2 0.4 0.2 2.8 5.2 11.6 14.0 14.8 1.4 0.4 0.6 0.8 0.4
Lord Howe Island Aero 8.6 3.2 1.6 3.2 0.2 0.4 - 2.4 22.4 1.0 - 7.2 - 26.6 30.0 0.6 - - 1.2 2.2

8.8 18.6 25.6
- 0.2 -
Norfolk Island Aero 1.2 0.2 1.8 0.2 0.4 0.2 0.8 - 0.8 0.6 - - 4.4 1.0 0.6 0.2 13.0 4.6 1.4 0.4 0.4 0.8 1.0 17.8 1.0 6.6 0.2 2.0 2.8 1.6
Antarctica and Macquarie Island (300)123456789101112131415161718192021222324252627282930
Casey - - - 0.2 - 2.6 0.2 - - - 1.4 - - 7.8 - - 3.8 - - 0.6

4.2 0.6 0.2 - 0.2 - - -
Davis 1.6 -
1.8 1.0 0.2 - - 1.2 1.2 - - - - - - - - 2.0
- - - -
- - 0.2 -
Macquarie Island 1.2 10.6 12.4 0.8 1.6 1.6 5.0 4.4 3.4 1.6 6.2 1.8 0.4 0.4 8.8 1.8 3.6 1.2 1.8 8.4 0.6 - 0.2 1.0 0.2 0.2 - - 3.2 0.4
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 3 pm on Wednesday 1 July 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