Tuesday, 1 September 2015 — Seasonal Climate Summary for Australia — Product Code IDCKGC1A00
Australia in winter 2015
Winter was a warm season for most of Australia, but cooler than average for much of the southeast. Nationally, maximum temperatures were the equal-eighth warmest on record for winter and mean temperatures were the ninth warmest on record (anomalies of +0.83 °C and +0.79 °C respectively). The national minimum temperature anomaly was also above average at +0.75 °C.
Both maxima and minim were above to very much above average for Western Australia and Queensland, including an area of warmest-on-record for maximum temperatures in northwest Western Australia. Maximum temperatures were also above average for the north and west of the Northern Territory, and minimum temperatures above average for the north of South Australia.
Maximum temperatures were cooler than average for much of southeastern Australia although average to above average in eastern New South Wales. Minimum temperatures were cooler than average for Tasmania, and part of central Victoria, southeastern New South Wales, the northern agricultural districts of South Australia, and a pocket of the northwestern Alice Springs district in the Northern Territory.
Rainfall during winter was 16% below the long-term mean for Australia as a whole. Rainfall was lower than average for the season in most of Victoria and southeastern South Australia, much of Tasmania, southwest Western Australia, and along the east coast of central New South Wales to southeast Queensland. Much of northern Australia is seasonally dry at this time of year—this meant very small negative anomalies resulted in a drier-than-average season for parts of northern Queensland and much of the north of Western Australia.
The national maximum temperature anomaly for winter was +0.83 °C, the equal-eighth warmest on record. For Western Australia winter maxima were the second warmest on record at +1.44 °C, 0.12 °C behind the record set in 2002. Tasmania observed its tenth-coolest winter (anomaly −0.62 °C), reflecting cooler-than-average days for much of the southeast.
Maximum temperatures were above to very much above average over Western Australia and the adjacent margin of South Australia; for an area of the western Kimberley winter maxima were warmest on record. Maximum temperatures during June contributed substantially, with the majority of Western Australia in the highest 10% of historical observations (decile 10) for the month, with numerous daily and monthly records set. Winter maxima were also above to very much above average for the west and north of the Northern Territory, nearly all of Queensland, and along a narrow strip of the northern coast of New South Wales. Apart from the very warm June in the west, the story was one of above-average daytime temperatures around western and northern Australia in each winter month.
Maximum temperatures were below average for most of New South Wales inland of the Great Dividing Range and away from the Queensland border, most of Victoria except the far northeast, southeast South Australia, an area extending from the Eyre Peninsula through the Riverlands, and nearly all of Tasmania. While June was generally near-average for daytime temperatures in the southeast, July and August were cooler than average for most of the region, and August very much cooler than average for Tasmania.
Winter minimum temperatures were also above to very much above average for most of Western Australia and Queensland, except for parts of the northern Kimberley and the Cape York Peninsula. Minima were also above average for western and northern South Australia, parts of northern New South Wales, parts of the south and west of the Northern Territory and a pocket of the southwestern Top End. June minima were very much above average for Queensland, while August produced very-much-warmer-than-average nights for Western Australia.
For winter as a whole, minimum temperatures were below average for central Victoria and South Gippsland, parts of the southern Riverina and South West Slopes districts in New South Wales, and also for an area of the South West Slopes in New South Wales, parts of the northern agricultural districts in South Australia, and an area of the northwestern Alice Springs District in the Northern Territory. For Tasmania winter nights were the tenth-coolest on record (anomaly −0.63 °C), with minima across the State below to very much below average. August was a particularly cool month for Tasmania, with minimum temperatures the fourth coolest on record and some records set.
|Areal average temperatures|
|Maximum Temperature||Minimum Temperature||Mean Temperature|
|Australia||= 98||+0.83||equal 8th highest||93||+0.75||98||+0.79||9th highest|
|Queensland||94||+0.96||98||+1.46||9th highest||97||+1.21||10th highest|
|New South Wales||52||+0.03||72||+0.40||64||+0.22|
|Victoria||= 28||−0.37||43||−0.16||= 27||−0.26|
|Tasmania||10||−0.62||10th lowest; lowest since 1992||10||−0.63||10th lowest; lowest since 1995||= 6||−0.62||equal 6th lowest; lowest since 1966|
|Western Australia||105||+1.44||2nd highest (record +1.56 °C in 2002)||100||+0.95||7th highest; highest since 1998||105||+1.20||2nd highest (record +1.41 °C in 1996)|
Rank ranges from 1 (lowest) to 106 (highest). A rank marked with ’=‘ indicates the value is tied for that rank. Anomaly is the departure from the long-term (1961–1990) average.
Nationally, area-averaged winter rainfall was 16% below the long-term mean.
Winter rainfall was below to very much below average for southwest Western Australia, southeastern South Australia, all of Victoria except Gippsland, most of Tasmania, and along the east coast between Syndey and southeast Queensland. Rainfall for southwest Western Australia, southeast South Australia and western Victoria was below average in each month of winter, continuing a long run of drier-than-average months for these areas.
Rainfall for the season was above to very much above average for much of southern Western Australia away from the southwest, for much of New South Wales inland of the Great Dividing Range and an adjacent part of South Australia, and also for coastal southeast New South Wales and far East Gippsland in Victoria.
Moderate totals for winter in the eastern Top End, Barkly district of the Northern Territory, and parts of the North Tropical Coast of Queensland and the Cape York Peninsula resulted in above-average rainfall for the season. Elsewhere in the north some areas observed small negative rainfall anomalies, although most of this area is seasonally dry.
|New South Wales||71||125.2||+8%|
Rank ranges from 1 (lowest) to 116 (highest). A rank marked with ’=‘ indicates the value is tied for that rank. Departure from mean is relative to the long-term (1961–1990) average.
|Australian weather extremes in winter 2015|
|Hottest day||37.6 °C at Warmun on 25 August (WA)|
|Coldest day||−5.4 °C at Mount Hotham (Vic.) on 1 June|
|Coldest night||−12.8 °C at Perisher Valley AWS (NSW) on 4 August|
|Warmest night||26.2 °C at Troughton Island (WA) on 1 June|
|Wettest day||320.0 mm at Bellenden Ker Top Stn (Qld.) on 30 June|
The Seasonal Climate Summary is prepared to list the main features of the weather in Australia using the most timely and accurate information available on the date of publication; it will generally not be updated. Later information, including data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review, usually published in the fourth week of the month.
Climate Summaries are usually published on the first working day of each month.
This statement has been prepared based on information available at 10 am EST on Tuesday 1 September 2015. Some checks have been made on the data, but it is possible that results will change as new information becomes available, especially for rainfall where much more data becomes available as returns are received from volunteers.
Long-term averages in this statement and associated tables are for the period 1961 to 1990 unless otherwise specified.
The system used for calculating areal averages of rainfall was changed in May 2009; the main effect was that current and historical values for Tasmania were increased. Since December 2012, ACORN-SAT has been used for calculating areal averages of temperature; the major change from earlier datasets is that the ACORN-SAT dataset commences in 1910, and hence rankings are calculated using a larger set of years.