Wednesday, 1 August 2018 - Monthly Climate Summary for Remote Islands and Antarctica - Product code IDCKGC1RR0
Remote Islands and Antarctica in July 2018
Jump to a map of the areas covered in this summary
Australia's Indian Ocean islands
- A cool July for Christmas Island, with temperatures more than a degree cooler than average and the lowest July mean temperature since 1994; sea surface temperatures around the Island have also been much cooler than usual
- Temperatures were slightly average on the Cocos (Keeling) Islands
- Rainfall below average, with Christmas Island Aero recording only 17.8 mm for the whole month and Cocos Islands Airport recording 96.0 mm
- Large waves affected the Cocos (Keeling) Islands on the 23rd and 24th, damaging roads, ripping trees from the ground and causing flooding on the south end of West Island
Australia's Pacific Ocean islands
- Days on Lord Howe Island were about half a degree warmer than average, but nights were around half a degree cooler than average
- The temperature at Lord Howe Island Aero dropped to 6.1 °C on the morning of the 23rd, the lowest July temperature on record and the second-lowest temperature for any time of year (behind 5.9 °C on 11 September 1992)
- Rainfall was about three quarters of average on Lord Howe Island
- Temperatures were above average on Norfolk Island, despite a run of cool mornings from the 20th
- It was the driest July on record at Norfolk Island Aero, with total rainfall of 30.8 mm well below the July average of around 140 mm
Australia's Antarctic and sub-Antarctic territories
- It was a cold start to the month for Australia's Antarctic stations: on the 4th, Casey's temperature dropped to -30.0 °C and Davis dropped to -28.0 °C
- Mawson's temperature dipped to -33.9 °C on the 10th, the lowest for any time of year since May 2012 and the lowest for July since 1998
- Temperatures rose markedly later in the month: on the 25th Mawson reached -2.8 °C and Davis reached -0.3 °C, both the warmest July temperatures since 2009, and starting an unprecedented run of three July days above -0.5 °C at Davis
- Casey had its highest July temperature on record with a maximum of +3.0 °C on the 27th (the old site recorded a temperature of +3.5 °C in July 1976)
- On the 27th, Mawson and Davis both equalled their highest July daily minimum temperature records from 2007
- Overall, temperatures were more than a degree above average at Mawson, more than three degrees above average at Davis and over four degrees above average at Casey
- Macquarie Island was almost a degree warmer than average, with fewer cold days and nights than usual for July
- Rainfall on Macquarie Island was about 120% of the July average
Further information
- Media
- media@bom.gov.au (03) 9669 4057
- Enquiries
- helpdesk.climate@bom.gov.au
Records Summaries Daily observations Important notes the top
| Record lowest July total precipitation | |||||
|---|---|---|---|---|---|
|
New record (mm) |
Old record |
Years of record |
Average for July |
||
| Norfolk Island Aero | 30.8 | 32.8 | in 1977 | 125 | 139.6 |
| Record highest July temperature | ||||||
|---|---|---|---|---|---|---|
|
New record (°C) |
Old record |
Years of record |
Average for July |
|||
| Casey | 3.0 | on the 27th | 2.4 | on the 13th in 2009 | 30 | -10.7 |
| Record highest July daily minimum temperature | ||||||
|---|---|---|---|---|---|---|
|
New record (°C) |
Old record |
Years of record |
Average for July |
|||
| Mawson | -5.8 | on the 27th | = -5.8 | on the 6th in 2007 | 65 | -20.9 |
| Davis | -3.3 | on the 27th | = -3.3 | on the 5th in 2007 | 58 | -20.7 |
| Record lowest July temperature | ||||||
|---|---|---|---|---|---|---|
|
New record (°C) |
Old record |
Years of record |
Average for July |
|||
| Lord Howe Island Aero | 6.1 | on the 23rd | 6.6 | on the 28th in 2010 | 30 | 13.9 |
| Record lowest July mean daily minimum temperature | |||||
|---|---|---|---|---|---|
|
New record (°C) |
Old record |
Years of record |
Average for July |
||
| Christmas Island Aero | 21.2 | = 21.2 | in 1994 | 43 | 22.6 |
| Lowest July mean temperature for at least 20 years | |||||
|---|---|---|---|---|---|
|
Observed (°C) |
Most recent lower |
Average for July |
|||
| Christmas Island Aero | 23.3 | 23.2 | in 1994 | 24.4 | |
Records Summaries Daily observations Important notes the top
| Summary statistics for July 2018 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperatures (°C) |
Minimum temperatures (°C) |
Precipitation (millimetres) |
||||||||||
| Mean for July 2018 |
Diff from average |
Highest for July 2018 |
Mean for July 2018 |
Diff from average |
Lowest for July 2018 |
Total for July 2018 |
Average for July |
Rank of July 2018 |
Fraction of July average |
|||
| Offshore Islands (district 200) | ||||||||||||
| Christmas Island Aero | 25.3 | -1.0 | 26.8 | 1st | 21.2 | -1.4 | 18.9 | 14th | 17.8 | 96.7 | low | 18% |
| Cocos Island Airport | 28.6 | +0.5 | 30.0 | 1st | 24.4 | +0.4 | 22.0 | 16th | 96.0 | 210.8 | low | 46% |
| Lord Howe Island Aero | 19.5 | +0.5 | 21.5 | 6th | 13.3 | -0.6 | 6.1 | 23rd | 106.6 | 137.8 | average | 77% |
| Norfolk Island Aero | 19.4 | +1.0 | 21.1 | 1st | 14.1 | +0.5 | 11.9 | 27th | 30.8 | 139.6 | lowest | 22% |
| Antarctica and Macquarie Island (district 300) | ||||||||||||
| Casey | -6.9 | +3.8 | 3.0 | 27th | -14.0 | +5.0 | -30.0 | 4th | 6.8 | 26.7 | v low | 25% |
| Davis | -10.7 | +3.6 | -0.3 | 25th | -17.3 | +3.4 | -28.0 | 4th | 12.2 | 8.3 | high | 147% |
| Macquarie Island | 5.8 | +0.9 | 7.9 | 3rd | 2.6 | +1.0 | -0.9 | 10th | 89.0 | 74.4 | high | 120% |
| Mawson | -13.2 | +1.8 | -2.8 | 25th | -19.7 | +1.2 | -33.9 | 10th | ||||
| 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 2018 | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Offshore Islands (200) | 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 | 26.8 | 26.5 | 26.0 | 25.5 | 26.0 | 24.3 | 24.8 | 26.0 | 25.4 | 25.4 | 25.3 | 24.9 | 24.9 | 24.9 | 24.9 | 25.0 | 25.3 | 24.5 | 25.7 | 24.5 | 25.1 | 25.3 | 23.9 | 25.4 | 25.3 | 25.4 | 25.5 | 25.9 | 24.5 | 24.9 | 26.0 |
| Cocos Island Airport | 30.0 | 29.6 | 29.5 | 29.4 | 28.2 | 28.3 | 28.8 | 28.5 | 29.2 | 29.0 | 29.5 | 29.3 | 29.2 | 28.6 | 27.8 | 27.8 | 27.4 | 28.6 | 28.3 | 28.6 | 28.3 | 28.9 | 28.2 | 28.4 | 28.4 | 27.6 | 28.8 | 29.5 | 27.2 | 28.1 | 28.3 |
| Lord Howe Island Aero | 20.5 | 17.7 | 18.8 | 20.3 | 20.5 | 21.5 | 19.9 | 18.4 | 18.6 | 18.2 | 18.8 | 19.5 | 18.3 | 18.2 | 17.8 | 20.3 | 19.0 | 20.7 | 20.5 | 21.3 | 18.0 | 17.9 | 18.1 | 20.0 | 21.4 | 20.5 | 20.8 | 19.7 | 20.5 | 19.4 | 19.4 |
| Norfolk Island Aero | 21.1 | 18.7 | 18.1 | 18.7 | 18.3 | 18.0 | 19.3 | 21.0 | 20.4 | 18.7 | 18.2 | 18.9 | 20.0 | 20.5 | 20.3 | 20.1 | 19.3 | 19.1 | 18.6 | 20.2 | 20.3 | 17.5 | 18.2 | 18.1 | 19.1 | 19.1 | 19.9 | 19.7 | 20.5 | 20.3 | 20.0 |
| Antarctica and Macquarie Island (300) | 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 | -17.7 | -23.7 | -22.8 | -13.8 | -7.4 | -7.4 | -6.4 | -4.3 | -9.0 | -8.3 | -8.7 | -7.1 | -6.8 | -5.3 | -4.4 | -5.5 | -4.8 | -2.5 | -4.8 | -3.1 | -3.4 | 0.5 | -0.6 | 0.0 | 1.4 | 2.6 | 3.0 | -11.1 | -9.2 | -15.8 | |
| Davis | -12.6 | -20.4 | -23.7 | -18.1 | -19.3 | -20.9 | -20.5 | -20.9 | -17.3 | -17.7 | -11.2 | -10.5 | -9.1 | -13.6 | -14.3 | -17.4 | -16.0 | -8.3 | -5.5 | -1.2 | -2.2 | -5.8 | -5.2 | -3.8 | -0.3 | -0.4 | -0.4 | -5.5 | -2.6 | -2.2 | -4.0 |
| Macquarie Island | 5.7 | 7.9 | 7.9 | 7.0 | 7.0 | 7.0 | 6.9 | 4.0 | 5.1 | 6.1 | 6.5 | 5.8 | 3.7 | 4.2 | 5.8 | 6.6 | 7.0 | 6.2 | 6.2 | 6.0 | 2.7 | 4.0 | 5.8 | 5.7 | 6.7 | 6.2 | 4.2 | 4.3 | 6.0 | 6.0 | 5.5 |
| Mawson | -12.3 | -17.2 | -15.7 | -15.5 | -19.2 | -23.1 | -24.6 | -24.1 | -27.1 | -18.0 | -14.0 | -19.9 | -15.5 | -16.3 | -20.1 | -14.4 | -10.4 | -12.1 | -14.7 | -8.8 | -10.1 | -8.6 | -9.4 | -4.6 | -2.8 | -3.1 | -3.4 | -4.4 | -6.6 | -6.7 | -6.3 |
|
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 2018 | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Offshore Islands (200) | 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 | 22.7 | 22.5 | 21.9 | 22.5 | 22.2 | 22.2 | 20.0 | 22.3 | 22.5 | 22.3 | 22.1 | 21.9 | 21.4 | 18.9 | 20.3 | 20.9 | 20.9 | 20.5 | 20.2 | 21.4 | 20.5 | 21.8 | 19.9 | 20.5 | 21.4 | 20.8 | 21.3 | 21.8 | 20.1 | 19.2 | 21.2 |
| Cocos Island Airport | 27.0 | 26.8 | 26.6 | 25.2 | 23.8 | 23.1 | 24.0 | 24.8 | 24.5 | 23.7 | 24.1 | 26.4 | 26.1 | 23.3 | 23.0 | 22.0 | 22.6 | 23.0 | 23.2 | 24.1 | 25.5 | 25.8 | 24.9 | 24.9 | 23.7 | 22.2 | 23.7 | 25.9 | 24.1 | 23.5 | 24.7 |
| Lord Howe Island Aero | 10.6 | 15.3 | 15.5 | 16.0 | 17.7 | 18.2 | 18.2 | 15.3 | 14.5 | 13.0 | 8.4 | 14.0 | 14.8 | 13.5 | 12.8 | 10.8 | 13.6 | 15.3 | 8.9 | 14.3 | 14.8 | 13.0 | 6.1 | 7.5 | 16.7 | 13.3 | 12.0 | 13.4 | 7.9 | 16.2 | 10.6 |
| Norfolk Island Aero | 15.2 | 14.9 | 15.8 | 15.2 | 14.5 | 14.7 | 13.2 | 16.4 | 15.1 | 15.5 | 12.5 | 12.7 | 15.3 | 16.4 | 16.2 | 13.7 | 12.9 | 13.9 | 15.5 | 12.9 | 12.8 | 14.5 | 12.6 | 13.1 | 12.6 | 12.4 | 11.9 | 13.1 | 13.6 | 12.8 | 15.7 |
| Antarctica and Macquarie Island (300) | 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 | -20.7 | -26.7 | -29.9 | -30.0 | -26.4 | -16.6 | -15.8 | -14.1 | -11.4 | -16.5 | -12.3 | -13.0 | -14.7 | -13.7 | -11.6 | -10.2 | -12.7 | -8.4 | -6.6 | -9.0 | -8.1 | -7.7 | -7.6 | -7.7 | -10.8 | -4.5 | -4.5 | -11.9 | -17.8 | -18.2 | |
| Davis | -27.4 | -20.5 | -25.9 | -28.0 | -25.3 | -21.8 | -25.3 | -24.5 | -25.1 | -24.8 | -25.3 | -24.7 | -14.5 | -14.0 | -17.9 | -21.1 | -25.0 | -23.5 | -20.3 | -9.5 | -6.3 | -6.4 | -13.3 | -13.3 | -7.5 | -5.1 | -3.3 | -6.2 | -10.8 | -13.4 | -6.1 |
| Macquarie Island | 3.4 | 3.2 | 5.6 | -0.3 | 2.2 | 3.8 | 4.8 | 2.9 | 1.4 | -0.9 | 0.0 | 1.3 | 2.1 | 0.3 | 2.0 | 3.7 | 4.9 | 4.2 | 4.8 | 2.8 | 1.4 | 0.0 | 0.6 | 3.6 | 4.9 | 5.6 | 3.4 | 0.5 | 0.5 | 3.5 | 3.4 |
| Mawson | -18.6 | -20.1 | -22.0 | -22.0 | -23.9 | -26.4 | -28.0 | -31.2 | -30.0 | -33.9 | -32.5 | -24.1 | -24.9 | -23.9 | -23.5 | -27.6 | -25.2 | -16.1 | -20.5 | -21.1 | -18.3 | -13.1 | -13.9 | -11.6 | -11.7 | -7.0 | -5.8 | -5.9 | -9.7 | -9.8 | -9.6 |
|
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 July 2018 | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Offshore Islands (200) | 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 | - | - | - | - | - | - | 2.8 | 0.2 | - | - | - | - | - | 9.2 | 0.2 | - | - | 1.2 | 1.8 | 0.2 | - | - | 0.4 | 0.4 | 0.2 | - | - | - | 0.2 | 1.0 | - | |
| Cocos Island Airport | - | - | - | 2.4 | 9.8 | 11.2 | 7.8 | - | 7.2 | 2.8 | 8.4 | - | - | 0.2 | - | 11.0 | 6.4 | 1.2 | 5.6 | 1.0 | - | - | 0.2 | 0.2 | - | 0.2 | 1.2 | 0.4 | 2.4 | 16.4 | - | |
| Lord Howe Island (Milky Way) | 0.2 | 0.8 | 8.0 | 6.6 | 0.2 | - | 0.6 | 23.4 | 2.4 | 0.4 | 0.2 | 1.6 | 16.4 | 21.0 | 4.0 | - | 1.2 | - | 0.2 | - | 10.2 | 1.2 | - | 0.2 | - | - | - | 17.2 | 0.2 | 2.6 | 1.0 | |
| Lord Howe Island Aero | 0.4 | 0.8 | 8.6 | 4.2 | - | - | 1.0 | 17.4 | 1.2 | 0.4 | 1.2 | 0.4 | 16.2 | 20.0 | 0.6 | - | 1.4 | - | - | - | 11.8 | 0.6 | - | 1.0 | - | - | - | 16.4 | - | 2.4 | 0.6 | |
| Norfolk Island Aero | - | 0.2 | 2.0 | 0.2 | 0.2 | - | - | - | - | - | - | 0.2 | - | 8.8 | - | - | - | 10.2 | 0.2 | - | 1.2 | 3.6 | - | 0.2 | - | - | 3.6 | 0.2 | - | - | - | |
| Antarctica and Macquarie Island (300) | 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 | - | 0.6 | - | - | - | - | - | 0.6 | 2.6 | - | - | - | - | - | 0.4 | 2.2 | 0.4 | - | - | - | - | - | - | - | - | |||||||
| Davis | - | - | - | - | - | - | - | - | 2.6 | 0.4 | - | 1.4 | 1.6 | - | 0.8 | - | - | 0.6 | 0.4 | - | 4.4 | - | - | - | - | - | - | - | - | - | ||
| Macquarie Island | 4.2 | 0.2 | 9.4 | 8.4 | 4.2 | 0.8 | 5.0 | 1.8 | 1.4 | 1.8 | 4.4 | 0.8 | 3.4 | 1.0 | 0.2 | 7.6 | 6.0 | 0.2 | 1.6 | 10.4 | 1.0 | - | 0.2 | - | 0.6 | 2.4 | 2.8 | 1.0 | 0.6 | 3.6 | 4.0 | |
|
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, 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 August 2018. 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
- media@bom.gov.au (03) 9669 4057
- Enquiries
- helpdesk.climate@bom.gov.au
Unless otherwise noted, all maps, graphs and diagrams in this page are licensed under the Creative Commons Attribution 4.0 International Licence
