Remote Islands and Antarctica in January 2020

Australia's Indian Ocean islands

  • It was a warm month on the Cocos (Keeling) Islands, with the mean maximum temperature more than a degree above average and the mean minimum temperature half a degree above average
  • There was only 49 mm of rain at Cocos Islands Airport, less than one-third of the January average
  • Christmas Island was warmer than usual, with the mean maximum temperature more than a degree above average and the mean minimum temperature half a degree above average, giving the second-warmest January mean temperature on record (behind January 2016)
  • Total rainfall of 274 mm at Christmas Island Airport was a little below the January average; most of the rain fell between the 20th and 26th

Australia's Pacific Ocean islands

  • Lord Howe Island was almost one and a half degrees warmer than average; the mean temperature was the second-warmest for January (behind January 2019)
  • Monthly rainfall of 56 mm at Lord Howe Island Airport was about half of the long-term average, but much more than the record dry January 2019
  • Most of Lord Howe Island's rain fell in less than 6 hours on the morning of the 12th
  • Norfolk Island had its driest month on record with just 0.6 mm for the whole month; the previous driest month was February 1926 with 2.8 mm, and the previous driest January was in 1946 with 3.7 mm
  • Combined with low rainfall in both November and December, the most recent two- and three-month periods are the driest on record for Norfolk Island
  • Daytime temperatures on Norfolk Island were almost a degree above average, but minimum temperatures were a little below average

Australia's Antarctic and sub-Antarctic territories

  • The mean temperature at Mawson was half a degree above average
  • At Davis, the mean temperature was more than a degree above average
  • Casey equalled its highest temperature on record with 9.2 °C on the 24th, and also had its highest January daily minimum temperature on record on the 25th
  • Casey had its second-warmest month on record, for any time of the year: the mean temperature was 1.5 °C above the January average, and just 0.1 °C cooler than the warmest month (January 2010)
  • The mean daily maximum was also second-warmest at Casey (and 0.1 °C behind January 2010), whilst the mean daily minimum temperature was also more than a degree above average
  • Macquarie Island was almost half a degree warmer than average
  • Macquarie Island's precipitation for the month was very much above average

Further information

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Record lowest January total precipitation
New record
(mm)
Old
record
Years of
record
Average for
January
Norfolk Island Aero 0.6 3.7 in 1946 127 86.6



Record highest January temperature
New record
(°C)
Old
record
Years of
record
Average for
January
Casey 9.2 on the 24th = 9.2 on the 30th in 1991 32 2.3

Also an equal record for any month


Record highest January daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
January
Casey 2.5 on the 25th 2.3 on the 11th in 2014 32 -2.5



Summary statistics for January 2020
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Precipitation
(millimetres)
Mean for
January
2020
Diff
from
average
Highest for
January
2020
Mean for
January
2020
Diff
from
average
Lowest for
January
2020
Total for
January
2020
Average
for
January
Rank of
January
2020
Fraction of
January
average
Offshore Islands (district 200)
Christmas Island Aero 29.0 +1.0 30.8 1st 23.4 +0.7 20.9 10th 273.6 296.7 average 92%
Cocos Island Airport 30.9 +1.1 31.6 30th 25.5 +0.6 22.3 14th 49.0 164.2 low 30%
Lord Howe Island Aero 27.0 +1.6 28.5 9th 21.9 +1.2 17.4 3rd 56.0 106.0 low 53%
Norfolk Island Aero 25.5 +0.9 27.0 28th 19.1 -0.1 16.3 6th 0.6 86.6 lowest 1%
Antarctica and Macquarie Island (district 300)
Casey 4.3 +2.0 9.2 24th -1.4 +1.1 -5.4 13th 3.9 9.4 low 41%
Davis 4.2 +1.0 6.9 18th -0.3 +0.9 -3.0 5th 1.2 1.9 average 63%
Macquarie Island 9.0 +0.2 10.6 27th 5.6 +0.3 2.5 19th 159.4 89.2 v high 179%
Mawson 2.9 +0.4 5.5 24th -2.4 +0.3 -5.4 1st
Note: Precipitation values from Casey and Davis should be used with caution.

Daily maximum temperatures for January 2020
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero30.830.029.428.327.828.929.228.728.728.929.129.728.128.729.529.129.330.128.129.028.629.529.128.928.429.429.629.029.128.129.4
Cocos Island Airport31.430.830.830.630.930.930.531.129.831.331.631.130.930.730.931.030.831.231.431.430.830.430.230.630.531.031.130.831.031.631.2
Lord Howe Island Aero26.726.426.526.028.327.924.826.528.527.328.324.426.527.426.525.927.226.126.127.027.827.827.327.428.327.527.226.627.528.328.1
Norfolk Island Aero25.824.624.825.325.424.724.223.723.424.526.126.226.425.925.825.425.725.924.725.126.026.425.225.726.426.326.327.026.126.526.2
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey5.86.15.94.06.17.23.15.53.52.02.12.33.96.15.04.54.53.05.25.25.04.08.39.27.64.52.31.40.30.30.1
Davis1.33.86.13.51.61.82.94.26.86.75.43.32.23.84.45.55.96.96.06.76.25.85.36.82.65.31.81.62.03.61.8
Macquarie Island9.98.98.79.67.78.07.99.68.29.19.37.58.79.89.38.36.37.29.310.59.310.010.410.69.510.310.69.09.88.09.1
Mawson3.33.92.32.63.62.53.94.04.63.90.11.51.80.42.52.13.14.94.53.64.74.83.15.53.94.23.0-0.61.00.21.5
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 January 2020
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero24.724.824.623.523.523.423.022.523.220.921.623.023.023.423.721.921.021.722.623.423.024.223.724.024.224.724.725.224.422.524.3
Cocos Island Airport26.526.424.026.226.426.025.425.824.424.225.925.725.322.324.422.825.123.526.126.926.024.924.424.527.126.726.926.626.626.926.1
Lord Howe Island Aero21.819.417.422.222.621.122.322.522.921.022.421.119.122.822.621.621.921.521.722.023.224.123.723.824.123.323.122.519.319.423.0
Norfolk Island Aero19.818.718.618.617.016.320.417.517.418.119.620.520.820.219.719.721.119.818.717.117.720.019.919.120.019.219.021.218.219.020.6
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey-4.70.3-1.2-0.81.21.1-2.8-1.6-0.1-1.5-1.5-1.8-5.4-2.3-0.9-2.1-3.7-3.4-0.21.2-0.1-0.1-0.70.82.51.1-2.5-3.4-5.0-2.6-3.3
Davis-2.3-2.8-0.10.2-3.0-2.2-0.2-0.22.02.50.20.4-0.6-2.0-1.31.4-0.2-0.20.61.81.60.70.50.40.0-0.5-2.0-1.5-1.3-1.2-1.2
Macquarie Island6.87.34.14.04.45.23.55.44.64.76.74.23.76.65.87.35.15.52.55.65.37.56.97.26.97.47.37.76.04.64.0
Mawson-5.4-2.9-3.8-5.0-1.4-2.6-3.2-0.31.4-0.4-0.4-1.6-1.3-3.5-3.6-3.9-4.3-0.7-4.2-2.8-2.2-1.9-0.7-0.4-3.4-3.6-2.5-4.1-2.2-2.3-2.3
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 January 2020
Offshore Islands (200)12345678910111213141516171819202122232425262728293031
Christmas Island Aero - - - 41.6 5.0 5.8 - - - - - - 2.2 2.0 5.2 - 0.2 - - 58.8 23.6 19.8 4.2 37.2 27.4 10.2 - - - 17.4 13.0
Cocos Island Airport - - 1.6 0.4 - - - - 0.4 1.6 - 1.2 - - - - 1.4 - - - - 8.4 18.0 15.0 - - - - - - 1.0
Lord Howe Island (Milky Way) - - - - - - - - - - 1.6 43.2 2.0 - - 3.6 - 2.8 4.0 1.2 1.6 0.2 - - - - - - - - -
Lord Howe Island Aero - - - - 0.2 - 0.2 0.2 - - 0.2 34.8 7.8 0.2 - 0.2 - 1.6 7.6 1.4 1.2 0.4 - - - - - - - - -
Norfolk Island Aero - - - - - - - - - 0.2 - 0.2 - - - - - 0.2 - - - - - - - - - - - - -
Antarctica and Macquarie Island (300)12345678910111213141516171819202122232425262728293031
Casey - - - - - - - - - - 0.2 1.6 - - - - - - 0.6 - 0.8 - - - - - - - - 0.7 -
Davis 0.2 - - -
- 0.2 - - - - - - - - - - - - - - 0.2 - - - - - - 0.6 - -
Macquarie Island 1.0 4.8 12.8 - 19.4 13.2 0.8 1.6 3.2 0.8 22.0 3.4 1.8 0.4 0.2 3.4 16.8 1.4 - - - 27.0 0.8 7.6 3.0 0.8 0.4 - 6.8 2.2 3.8
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 10 am on Monday 3 February 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
Enquiries