Remote Islands and Antarctica in June 2017

Australia's Indian Ocean islands

  • There were several days of moderate to heavy rain, leading to both Christmas Island and the Cocos (Keeling) Island having a very much wetter than usual June: the 481.4 mm at Cocos Island Airport was their wettest June since 1988
  • Daytime temperatures were generally below average, but overnight temperatures were above average

Australia's Pacific Ocean islands

  • Rainfall was near the June average at both Lord Howe and Norfolk Islands, with much of it falling between the 18th and 21st
  • Overnight temperatures were mostly above average, with a warm spell in the middle of the month but some chilly temperatures toward the end
  • Lord Howe Island was a little cooler than average by day, but Norfolk Island's days were a little warmer than average

Australia's Antarctic and sub-Antarctic territories

  • Australia's mainland Antarctic sites had a mostly very cold month, with the mean temperature at Mawson around 3 °C below average, Davis around 4 °C below average and Casey almost 5 °C below average
  • Casey's mean daily maximum temperature of −15.6 °C and mean temperature of −19.3 °C equalled the June low records from 1990
  • Davis reported 10 mm of snow on the 23rd and a total of 29 mm of precipitation for the month, well above the June average of around 10 mm (although there are some issues with the way precipitation has been measured and reported at Antarctic sties in the past)

Further information

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Highest June total precipitation for at least 20 years
Observed
(mm)
Most recent
higher
Average for
June
Cocos Island Airport 481.4 649.4 in 1988 214.5
Macquarie Island 132.4 155.4 in 1993 77.8



Record highest June mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
June
Macquarie Island 6.4 6.3 in 1979 69 5.1



Record lowest June mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
June
Casey -15.6 = -15.6 in 1990 28 -10.5



Record lowest June mean temperature
New record
(°C)
Old
record
Years of
record
Average for
June
Casey -19.3 = -19.3 in 1990 28 -14.5



Summary statistics for June 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Precipitation
(millimetres)
Mean for
June
2017
Diff
from
average
Highest for
June
2017
Mean for
June
2017
Diff
from
average
Lowest for
June
2017
Total for
June
2017
Average
for
June
Rank of
June
2017
Fraction of
June
average
Offshore Islands (district 200)
Christmas Island Aero 27.1 0.0 28.3 9th 23.8 +0.5 22.2 27th 510.0 180.1 v high 283%
Cocos Island Airport 28.4 -0.2 30.4 2nd 24.7 +0.2 23.1 1st 481.4 214.5 v high 224%
Lord Howe Island Aero 19.7 -0.2 21.3 24th 15.1 +0.2 9.7 28th 180.8 170.5 average 106%
Norfolk Island Aero 19.8 +0.5 21.4 21st 15.2 +0.5 12.8 27th 123.2 144.8 average 85%
Antarctica and Macquarie Island (district 300)
Casey -15.6 -5.1 -0.6 2nd -22.9 -4.4 -30.2 13th 13.8 25.9 low 53%
Davis -16.6 -4.1 -8.9 24th -23.1 -4.2 -35.4 22nd 29.3 9.7 v high 302%
Macquarie Island 6.4 +1.3 8.0 20th 2.3 +0.7 -0.6 9th 132.4 77.8 v high 170%
Mawson -16.8 -3.3 -11.5 24th -21.8 -2.2 -28.9 18th
Note: Precipitation values from Casey and Davis should be used with caution.

Daily maximum temperatures for June 2017
Offshore Islands (200)123456789101112131415161718192021222324252627282930
Christmas Island Aero25.926.726.527.527.327.227.928.328.328.027.728.027.127.327.126.927.427.226.926.627.527.026.726.727.025.524.826.327.427.6
Cocos Island Airport29.630.428.027.829.128.728.028.829.128.928.729.929.028.028.528.529.528.029.429.128.728.627.627.028.027.427.726.425.926.9
Lord Howe Island Aero18.619.519.719.419.619.519.019.619.420.020.320.020.520.720.820.920.419.619.518.919.719.420.221.318.819.518.819.120.818.0
Norfolk Island Aero20.320.119.820.219.020.020.821.018.119.119.519.520.520.219.020.020.219.520.220.221.420.519.819.320.119.319.618.619.219.9
Antarctica and Macquarie Island (300)123456789101112131415161718192021222324252627282930
Casey-7.0-0.6-3.3-11.2-12.6-14.4-16.8-20.6-18.9-18.8-20.2-21.7-19.2-18.2-7.1-7.5-16.0-17.5-23.1-12.7-15.4-18.9-16.4-21.2-20.6-14.7-19.1-23.3-12.2-18.9
Davis-14.8-19.1-21.7-24.9-16.6-14.7-13.9-16.7-15.9-11.2-11.2-11.3-15.3-22.7-24.5-26.5-28.8-25.7-15.5-21.9-19.9-14.5-9.4-8.9-11.8-15.6-11.5-9.9-12.9-9.7
Macquarie Island6.97.06.77.16.56.17.47.25.47.15.13.66.56.86.46.86.66.87.28.05.87.27.43.16.15.96.66.06.55.4
Mawson-12.9-17.7-20.4-21.7-21.4-14.4-13.9-15.0-14.5-12.5-13.2-14.2-13.4-16.1-22.5-24.3-23.4-20.3-15.4-20.0-17.9-17.3-12.0-11.5-13.8-17.3-18.3-22.1-13.3-12.6
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 June 2017
Offshore Islands (200)123456789101112131415161718192021222324252627282930
Christmas Island Aero22.522.424.624.624.124.324.424.625.023.623.624.024.424.523.424.224.424.624.124.224.023.723.523.122.323.122.223.022.824.3
Cocos Island Airport23.126.224.524.925.226.125.426.524.726.124.825.926.523.824.324.525.223.124.025.124.025.023.923.823.924.425.224.123.723.6
Lord Howe Island Aero13.614.415.015.715.215.211.315.513.516.116.116.317.017.517.317.318.817.616.616.716.916.615.814.510.813.012.89.710.314.6
Norfolk Island Aero14.416.616.216.113.213.213.214.316.114.815.213.115.016.815.916.113.516.916.918.017.117.517.114.514.814.112.814.814.012.9
Antarctica and Macquarie Island (300)123456789101112131415161718192021222324252627282930
Casey-15.7-16.4-9.3-13.5-16.3-19.7-20.0-22.3-24.5-23.9-25.4-25.3-30.2-26.5-23.5-22.2-20.1-19.2-25.1-28.7-24.3-22.3-25.8-24.2-26.3-26.4-26.8-26.7-28.5-29.0
Davis-17.7-19.8-23.2-25.1-27.2-25.8-20.1-20.1-21.6-21.7-20.8-17.7-17.9-25.0-26.3-29.2-31.0-34.3-33.7-26.2-35.0-35.4-21.8-17.1-12.1-15.9-18.5-22.3-14.1-16.3
Macquarie Island4.34.23.22.74.22.82.56.0-0.6-0.63.3-0.50.41.31.71.44.61.70.21.61.00.05.72.6-0.61.43.65.34.71.4
Mawson-18.0-19.8-22.8-25.0-25.6-22.9-23.1-16.2-17.5-18.2-16.7-17.2-16.1-16.7-24.6-27.6-28.6-28.9-26.2-22.8-24.7-23.9-19.8-18.2-14.8-19.6-20.5-23.8-27.4-26.2
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 2017
Offshore Islands (200)123456789101112131415161718192021222324252627282930
Christmas Island Aero 130 126 1.2 - 0.2 - - - - 6.6 2.4 0.2 - - 11.8 2.4 - - - - - - 8.0 7.4 137 2.4 50.0 6.8 18.0 -
Cocos Island Airport 54.8 0.2 22.8 15.6 2.6 0.4 - - 9.8 3.2 13.4 7.8 - 1.0 0.2 3.8 8.4 78.8 10.8 - 4.4 0.4 25.2 16.6 0.6 0.2 0.6 12.0 131 57.0
Lord Howe Island (Milky Way) 10.2 1.4 8.6 - - 0.6 5.8 0.4 8.4 5.6 2.8 1.8 0.2 2.2 0.4 - 0.2 4.0 73.0 19.6 13.0 0.8 - - 0.2 2.2 1.4 - - 24.6
Lord Howe Island Aero 14.6 2.0 4.4 - 0.2 - 1.0 1.8 11.0 4.0 6.2 - - 0.6 1.0 - - 1.0 63.0 15.0 20.8 2.0 0.2 - 1.4 2.6 3.2 - 0.2 24.6
Norfolk Island Aero 0.4 2.2 - - 5.0 0.2 - - 13.6 28.4 - 0.2 0.2 - 1.2 - 2.0 4.4 30.0 13.6 12.4 1.4 2.2 0.2 3.8 - 1.8 - - -
Antarctica and Macquarie Island (300)123456789101112131415161718192021222324252627282930
Casey -
- 0.2 -
0.2
- - - - - 0.8
1.2 - - - - 0.2 - - 10.8 0.4 - - -
-
Davis - - - - - - - - - 0.8 1.2 1.2 - - -
- - - 0.3
4.6 10.2 1.0 2.4 0.2 - 2.2 5.2 -
Macquarie Island 1.2 1.8 5.2 - 8.2 2.6 1.2 2.4 13.6 3.0 2.8 6.8 0.2 6.4 3.8 1.0 18.2 8.4 4.0 10.4 2.2 0.2 5.0 - 5.0 3.8 2.4 4.2 2.4
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 11 am on Monday 3 July 2017. 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.

Precipitation values from Casey and Davis should be used with caution.

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