Remote Islands and Antarctica in spring 2017

Australia's Indian Ocean islands

  • Temperatures were close to average on the Cocos (Keeling) Islands, and a little above average on Christmas Island
  • Cocos Islands Airport reached 31.1 °C on the 7th, equalling its highest spring temperature on record
  • Christmas Island Airport recorded 212.6 mm of rain in the 24 hours to 9 am on 29 November from an active monsoon trough to the north in which tropical cyclone Cempaka and then tropical cyclone Dahlia formed; this was its wettest day on record for any time of year, exceeding the 195.8 mm on 13 October 2016
  • Christmas Island Airport received 636 mm of rain from September to November: double the long-term average but well short of the record-breaking 2068 mm over the same period last year
  • Cocos Islands Airport reported 176 mm of rain, about two thirds of the long term average

Australia's Pacific Ocean islands

  • Lord Howe Island's temperatures were above average, particularly in October, with the mean daily minimum temperature equalling the spring record from 1996
  • With its driest September on record, and then below-average rain in both October and November, Lord Howe Island airport had spring total rainfall just two-thirds of the long term average
  • Temperatures on Norfolk Island were about half a degree above average for spring, both by day and by night
  • Norfolk Island airport received only 136 mm of rain, its driest spring since 2006

Australia's Antarctic and sub-Antarctic territories

  • Temperatures were below average for spring: by about half a degree at Mawson, around a degree at Davis, and more than a degree at Casey
  • Temperatures were below average in September and October, but above average in November
  • Casey had its lowest spring mean daily maximum temperature since 1993, and its lowest spring temperature on record with an overnight minimum of -33.8 °C on 28 September (although the old site reported a lower temperature in 1982)
  • With all three months seeing above-average precipitation, Macquarie Island had its second-wettest spring on record, just 0.1 mm behind that from 1955 (the automated gauge reported slightly more rain, but the manual gauge is considered more reliable for this spring)
  • Temperatures on Macquarie Island were about half a degree warmer than the spring average

Further information

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Record highest spring daily precipitation
New record
(mm)
Old
record
Years of
record
Christmas Island Aero 212.6 on 29 Nov 195.8 on 13 Oct 2016 45



Record highest spring total precipitation
New record
(mm)
Old
record
Years of
record
Average for
spring
Macquarie Island 309.8 309.9 in 1955 69 227.7
Note: this total is from the manual rain gauge; the automatic gauge reported somewhat more


Record highest spring temperature
New record
(°C)
Old
record
Years of
record
Average for
spring
Cocos Island Airport 31.1 on 7 Nov = 31.1 on 30 Nov 2016 66 28.7



Lowest spring mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
spring
Casey -8.0 -8.5 in 1993 -6.7



Record lowest spring temperature
New record
(°C)
Old
record
Years of
record
Average for
spring
Casey -33.8 on 28 Sep -32.9 on 19 Sep 2015 29 -13.6



Record highest spring mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
spring
Lord Howe Island Aero 16.6 16.5 in 1996 28 15.9



Summary statistics for spring 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Precipitation
(millimetres)
Mean for
spring
2017
Diff
from
average
Highest for
spring
2017
Mean for
spring
2017
Diff
from
average
Lowest for
spring
2017
Total for
spring
2017
Average
for
spring
Rank of
spring
2017
Fraction of
spring
average
Offshore Islands (district 200)
Christmas Island Aero 26.8 0.0 29.0 3 Nov 22.9 +0.3 21.0 18 Nov 635.8 301.5 high 211%
Cocos Island Airport 28.7 0.0 31.1 7 Nov 24.4 +0.2 22.3 27 Sep 176.0 277.7 average 63%
Lord Howe Island Aero 21.4 +0.3 24.9 30 Oct 16.6 +0.7 8.4 12 Sep 222.4 326.1 low 68%
Norfolk Island Aero 20.8 +0.5 24.3 7 Nov 15.6 +0.7 11.5 14 Sep 136.2 250.6 v low 54%
Antarctica and Macquarie Island (district 300)
Casey -8.0 -1.3 2.0 26 Nov -14.7 -1.1 -33.8 28 Sep 20.2 44.9 v low 45%
Davis -8.6 -0.7 2.9 4 Nov -15.6 -1.4 -31.5 3 Sep 12.0 11.3 average 106%
Macquarie Island 6.4 +0.5 8.9 29 Nov 2.7 +0.6 -1.8 16 Oct 317.8 227.7 highest 140%
Mawson -8.9 0.0 3.1 6 Nov -15.6 -0.4 -27.6 4 Sep
Note: Precipitation values from Casey and Davis should be used with caution.

Map of the areas covered by this summary

Notes

The Seasonal 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 2 pm on Friday 1 December 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.

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.

Further information

Media
(03) 9669 4057
Enquiries