Tuesday, 1 August 2023 - Monthly Climate Summary for Remote Islands and Antarctica - Product code IDCKGC1RR0
Remote Islands and Antarctica in July 2023
Jump to a map of the areas covered in this summary
Australia's Indian Ocean islands
- Christmas Island Aero was drier than average in July, with a monthly rainfall total of 16.2 mm, which was 18% of the July average.
- At Christmas Island Aero, the mean maximum temperature equalled the long-term average, while the mean minimum temperature was 0.2 °C warmer than average.
- Rainfall in July for Cocos Island Aero was 23.0 mm, which was very much below the site's July average rainfall of 209.4 mm.
- At Cocos Island Aero, both the mean maximum and mean minimum temperatures were cooler than average.
Australia's Pacific Ocean islands
- Total July rainfall for Lord Howe Island Aero was 36.2 mm, which was 25% of the July average.
- The mean maximum temperature at Lord Howe Island was 0.2 °C above average, while the mean minimum temperature was 0.3 °C below average.
- Total July rainfall for Norfolk Island Aero was 25.8 mm, which was 18% of the July average.
- At Norfolk Island Aero, the mean maximum temperature was 0.01 °C below average and the mean minimum temperature was 0.01 °C above average.
Australia's Antarctic and sub-Antarctic territories
- The strongest wind gust recorded at Australia's Antarctic stations in July was 170 km/h at Mawson on the 4th.
- Both mean maximum and mean minimum temperatures were below average at Australian Antarctic stations, with temperatures generally above average in the first half of the month but very much below average later in the month.
- The coldest July day (lowest maximum temperature) on record at Casey was observed on the 27th at -30.9 °C. The previous record was -27.9 °C in 1997. The average maximum temperature for July is -10.5 °C.
- The coldest July (lowest minimum temperature) on record at Casey was observed on the 28th at -36.4 °C. The previous record was -34.2 °C in 2016. The average for July is -18.7 °C.
- At Macquarie Island, the mean maximum temperature was 0.9 °C above average and the mean minimum temperature was 0.8 °C above average.
- Macquarie Island had its highest total July precipitation on record, at 142.4 mm, the previous July record was 126.2 mm in 1994.
- The strongest wind gust at Macquarie Island was recorded on 4th at 113 km/h.
Records Summaries Daily observations Important notes the top
| Record highest July total precipitation | |||||
|---|---|---|---|---|---|
|
New record (mm) |
Old record |
Years of record |
Average for July |
||
| Macquarie Island | 142.4 | 126.2 | in 1994 | 74 | 75.4 |
| Record lowest July daily maximum temperature | ||||||
|---|---|---|---|---|---|---|
|
New record (°C) |
Old record |
Years of record |
Average for July |
|||
| Casey | -30.9 | on the 27th | -27.9 | on the 25th in 1997 | 35 | -10.5 |
| Record lowest July temperature | ||||||
|---|---|---|---|---|---|---|
|
New record (°C) |
Old record |
Years of record |
Average for July |
|||
| Casey | -36.4 | on the 28th | -34.2 | on the 11th in 2016 | 35 | -18.7 |
Records Summaries Daily observations Important notes the top
| Summary statistics for July 2023 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperatures (°C) |
Minimum temperatures (°C) |
Precipitation (millimetres) |
||||||||||
| Mean for July 2023 |
Diff from average |
Highest for July 2023 |
Mean for July 2023 |
Diff from average |
Lowest for July 2023 |
Total for July 2023 |
Average for July |
Rank of July 2023 |
Fraction of July average |
|||
| Offshore Islands | ||||||||||||
| Christmas Island Aero | 26.3 | 0.0 | 27.0 | 1st | 22.8 | +0.2 | 21.1 | 8th | 16.2 | 90.4 | low | 18% |
| Cocos Island Airport | 27.7 | -0.4 | 29.1 | 2nd | 24.0 | -0.1 | 22.2 | 18th | 23.0 | 209.4 | lowest | 11% |
| Lord Howe Island Aero | 19.2 | +0.2 | 21.3 | 31st | 13.6 | -0.3 | 8.1 | 29th | 36.2 | 143.3 | lowest | 25% |
| Norfolk Island Aero | 18.3 | -0.1 | 21.0 | 6th | 13.7 | +0.1 | 11.4 | 30th | 25.8 | 139.7 | lowest | 18% |
| Antarctica and Macquarie Island | ||||||||||||
| Casey | -12.7 | -2.2 | -4.4 | 7th | -21.8 | -3.1 | -36.4 | 28th | 33.1 | 27.1 | high | 122% |
| Davis | -18.0 | -3.8 | -5.8 | 3rd | -25.2 | -4.6 | -36.1 | 27th | 5.8 | 8.1 | average | 72% |
| Macquarie Island | 5.8 | +0.9 | 7.5 | 29th | 2.4 | +0.8 | -2.6 | 2nd | 142.4 | 75.4 | highest | 189% |
| Mawson | -16.1 | -1.2 | -7.6 | 9th | -22.5 | -1.6 | -32.9 | 31st | ||||
| Note: Precipitation values from Casey and Davis should be used with caution. | ||||||||||||
Records Summaries Daily observations Important notes the top
| Daily maximum temperatures for July 2023 | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Offshore Islands | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| Christmas Island Aero | 27.0 | 26.2 | 26.3 | 26.0 | 26.5 | 26.0 | 25.8 | 25.5 | 25.5 | 25.8 | 26.5 | 26.7 | 26.1 | 26.7 | 26.7 | 26.3 | 26.7 | 26.8 | 26.2 | 26.0 | 25.8 | 25.5 | 25.7 | 26.9 | 26.4 | 26.9 | 26.6 | 26.3 | 26.3 | 26.1 | |
| Cocos Island Airport | 28.8 | 29.1 | 28.4 | 27.6 | 27.5 | 27.3 | 27.9 | 28.0 | 28.0 | 27.8 | 27.9 | 27.5 | 28.0 | 27.7 | 27.0 | 28.0 | 27.5 | 27.9 | 28.2 | 27.9 | 27.6 | 27.1 | 27.8 | 28.4 | 27.5 | 27.5 | 27.2 | 26.7 | 27.4 | 26.7 | 26.7 |
| Lord Howe Island Aero | 19.2 | 18.9 | 19.2 | 19.4 | 19.7 | 21.1 | 18.7 | 18.7 | 18.8 | 19.5 | 19.4 | 19.7 | 18.3 | 19.4 | 19.8 | 21.2 | 19.6 | 18.8 | 18.2 | 17.4 | 19.4 | 17.4 | 18.1 | 18.5 | 18.1 | 18.7 | 17.8 | 19.1 | 20.5 | 20.6 | 21.3 |
| Norfolk Island Aero | 19.3 | 18.9 | 18.5 | 17.4 | 18.9 | 21.0 | 20.0 | 18.7 | 19.4 | 19.1 | 18.7 | 18.6 | 18.0 | 17.7 | 18.2 | 17.3 | 18.0 | 18.0 | 18.6 | 17.5 | 18.2 | 17.5 | 17.8 | 17.7 | 17.2 | 18.2 | 17.3 | 17.9 | 17.2 | 18.1 | 18.8 |
| Antarctica and Macquarie Island | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| Casey | -6.6 | -9.4 | -13.9 | -20.1 | -9.0 | -5.4 | -4.4 | -10.1 | -15.3 | -15.2 | -16.1 | -8.2 | -7.9 | -11.2 | -5.9 | -7.5 | -10.1 | -13.8 | -16.8 | -15.8 | -12.8 | -8.8 | -14.0 | -18.0 | -25.7 | -24.2 | -30.9 | -12.0 | -6.7 | -6.0 | -12.6 |
| Davis | -27.0 | -19.4 | -5.8 | -6.4 | -10.5 | -14.6 | -12.4 | -8.7 | -6.3 | -8.5 | -12.2 | -11.2 | -17.3 | -17.2 | -20.0 | -20.5 | -20.2 | -14.7 | -13.8 | -15.3 | -19.9 | -23.8 | -23.0 | -22.1 | -22.4 | -27.6 | -28.1 | -27.4 | -26.3 | -29.7 | -24.2 |
| Macquarie Island | 1.2 | 3.3 | 4.8 | 2.5 | 4.8 | 6.6 | 6.9 | 7.1 | 6.9 | 6.9 | 4.3 | 6.3 | 5.8 | 7.2 | 7.0 | 5.9 | 4.8 | 2.7 | 5.4 | 6.8 | 7.0 | 6.7 | 6.7 | 6.7 | 6.2 | 6.4 | 7.3 | 7.3 | 7.5 | 7.1 | 5.2 |
| Mawson | -21.6 | -11.5 | -9.6 | -8.2 | -8.1 | -13.4 | -15.9 | -14.4 | -7.6 | -9.4 | -13.9 | -14.5 | -14.7 | -16.7 | -20.2 | -19.7 | -12.9 | -11.9 | -10.7 | -10.4 | -14.2 | -18.2 | -23.7 | -25.3 | -22.1 | -18.7 | -20.2 | -24.3 | -26.8 | -25.4 | -14.3 |
|
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 July 2023 | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Offshore Islands | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| Christmas Island Aero | 23.2 | 22.4 | 22.6 | 22.2 | 22.1 | 23.3 | 22.6 | 21.1 | 22.6 | 23.1 | 23.7 | 23.7 | 23.3 | 23.1 | 22.8 | 22.5 | 23.1 | 23.0 | 23.3 | 23.0 | 22.9 | 22.7 | 23.2 | 22.6 | 22.5 | 23.1 | 23.2 | 22.0 | 22.5 | 22.8 | |
| Cocos Island Airport | 24.3 | 23.3 | 24.0 | 25.0 | 24.5 | 23.9 | 24.2 | 24.0 | 24.4 | 24.8 | 24.5 | 24.8 | 23.6 | 23.7 | 25.2 | 24.7 | 22.2 | 23.8 | 24.7 | 24.9 | 23.8 | 23.1 | 24.6 | 24.4 | 24.4 | 22.9 | 23.6 | 23.6 | 22.9 | 23.0 | |
| Lord Howe Island Aero | 15.3 | 16.1 | 15.5 | 14.9 | 16.3 | 14.0 | 17.0 | 14.9 | 14.5 | 16.3 | 12.3 | 14.8 | 9.4 | 12.0 | 13.0 | 16.1 | 11.4 | 15.5 | 14.1 | 12.7 | 15.5 | 13.0 | 14.6 | 9.8 | 11.3 | 15.4 | 10.8 | 8.6 | 8.1 | 17.4 | 11.5 |
| Norfolk Island Aero | 14.5 | 14.8 | 13.8 | 15.6 | 12.0 | 14.6 | 16.8 | 16.4 | 14.9 | 15.2 | 15.0 | 13.1 | 13.8 | 13.4 | 14.0 | 14.0 | 11.9 | 14.0 | 12.9 | 13.9 | 13.7 | 13.5 | 12.8 | 11.9 | 12.5 | 13.8 | 13.4 | 13.2 | 11.5 | 11.4 | 11.7 |
| Antarctica and Macquarie Island | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| Casey | -28.6 | -11.6 | -15.8 | -25.1 | -25.8 | -25.3 | -13.0 | -10.4 | -16.6 | -29.0 | -27.6 | -22.2 | -21.9 | -15.5 | -16.6 | -19.3 | -13.2 | -17.4 | -22.4 | -23.1 | -18.6 | -19.2 | -18.4 | -19.2 | -32.5 | -32.4 | -33.1 | -36.4 | -35.1 | -13.4 | -15.6 |
| Davis | -28.6 | -31.9 | -34.7 | -19.5 | -14.6 | -19.3 | -18.0 | -16.4 | -17.7 | -10.7 | -20.1 | -19.6 | -20.1 | -21.7 | -21.6 | -25.3 | -27.0 | -28.8 | -26.3 | -20.6 | -21.5 | -28.7 | -31.2 | -26.0 | -27.6 | -35.5 | -36.1 | -31.7 | -31.4 | -33.0 | -34.9 |
| Macquarie Island | -1.8 | -2.6 | -0.6 | 1.6 | 0.4 | 1.5 | 4.6 | 5.3 | 4.7 | 5.1 | 3.4 | -1.9 | 0.5 | 1.7 | 5.5 | 3.2 | 3.3 | 0.9 | 0.0 | 1.8 | 5.3 | 4.5 | 3.1 | 4.4 | 2.5 | 2.1 | 1.1 | 4.7 | 1.5 | 3.2 | 4.1 |
| Mawson | -29.2 | -29.5 | -25.4 | -13.1 | -10.2 | -16.0 | -19.1 | -20.9 | -18.9 | -14.4 | -17.7 | -18.2 | -17.4 | -18.0 | -22.3 | -24.7 | -25.3 | -21.5 | -13.9 | -13.8 | -16.0 | -21.1 | -26.5 | -29.3 | -32.6 | -32.4 | -26.2 | -28.2 | -29.2 | -32.6 | -32.9 |
|
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 July 2023 | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Offshore Islands | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
| Christmas Island Aero | - | 0.6 | - | - | - | 5.0 | 4.2 | 0.4 | - | - | 1.2 | - | - | - | 2.2 | 0.6 | - | - | - | - | - | 0.2 | 0.6 | - | - | - | 1.2 | - | - | |||
| Cocos Island Airport | - | 2.6 | 10.8 | 0.2 | 0.2 | 0.8 | 0.2 | - | 0.2 | 0.2 | 1.2 | 2.4 | - | - | - | - | - | - | - | 1.0 | 0.2 | - | - | 1.0 | 0.6 | - | 0.6 | 0.8 | ||||
| Lord Howe Island (Milky Way) | 1.8 | - | 0.6 | 1.4 | - | 23.0 | 3.6 | 3.0 | 2.0 | - | 0.6 | - | - | - | - | - | 0.4 | 1.0 | 18.2 | 2.6 | - | 1.6 | 1.0 | 0.6 | 1.6 | - | - | - | - | - | 0.4 | |
| Lord Howe Island Aero | 3.0 | - | - | 0.2 | 1.4 | 15.4 | 0.6 | 3.8 | - | 1.8 | 0.2 | - | - | - | 0.2 | - | 3.0 | - | 2.6 | 0.2 | 1.0 | 2.6 | - | 0.2 | - | - | - | - | ||||
| Norfolk Island Aero | 0.8 | 5.2 | 3.2 | - | - | 2.8 | 0.6 | 1.2 | 0.2 | 1.8 | - | - | - | 0.4 | 0.8 | - | 0.8 | - | 4.2 | 1.0 | 0.4 | - | 0.6 | 1.4 | 0.2 | 0.2 | ||||||
| Antarctica and Macquarie Island | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
| Casey | 9.1 | 0.2 | - | - | 11.2 | 3.6 | 1.2 | - | 3.2 | - | 1.8 | - | - | 0.4 | - | - | - | 0.2 | - | - | - | - | - | - | 1.8 | 0.4 | - | |||||
| Davis | - | - | - | 1.8 | - | - | - | 2.6 | 0.1 | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1.1 | - | - | - | - | - | - | |
| Macquarie Island | 3.2 | 9.8 | 5.0 | 4.6 | 0.2 | 0.4 | 2.4 | 3.2 | 2.4 | 1.6 | 7.4 | 22.6 | 1.8 | 2.2 | 2.0 | 0.8 | 5.4 | 2.8 | 2.2 | 1.0 | - | 1.0 | 5.0 | 3.4 | 11.0 | 7.8 | 8.0 | 2.0 | 14.0 | 4.8 | 4.4 | |
|
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 | ||||||||||||||||||
Records Summaries Daily observations Important notes the top
Notes
The Monthly climate summary, usually published in the first week of the following 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.
This statement has been prepared based on information available at 2 pm on Tuesday 1 August 2023. 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.
Information about Australian Indigenous seasonal calendars is available at the Indigenous Weather Knowledge website.
Unless otherwise noted, all maps, graphs and diagrams in this page are licensed under the Creative Commons Attribution 4.0 International Licence
