Australia in April 2017

In brief

  • A warmer than average month overall.
  • The continuation of warm conditions contributed to the sixth warmest January to April period on record.
  • Rainfall below average overall.
  • Above average rain for northwestern Western Australia through to South Australia, western New South Wales and much of Victoria.

Temperatures

The national mean temperature for April was 0.09 °C above average. The national mean maximum temperature was 0.28 °C above average and mean minimum temperature 0.10 °C below average. Following the exceptionally warm March, temperatures for April were relatively less extreme across the country. Temperatures were mostly below average along the east coast and parts of central and southern Western Australia. Temperatures were above average across northern Australia, southwest Queensland, and southeast Australia excluding eastern Victoria. There were some areas of very much above average temperatures (in the highest 10% of historical observations; decile 10) in the central part of the west coast of Western Australia and the west coast of Tasmania. Temperatures were close to average elsewhere.

Maximum temperatures were average to very much above average for Tasmania; parts of coastal Victoria; southwestern New South Wales; western, central and areas of northern Queensland; much of the Northern Territory excluding the far north; parts of southeastern South Australia; and western parts of Western Australia extending south from the Gascoyne region. Western parts of Tasmania were very much above average for the month as was an area along the central west coast of Western Australia.

Maximum temperatures were below average for the far north of the Northern Territory and Queensland, for southeast Queensland and northeast New South Wales and in regions in the north central parts of Western Australia.

Minimum temperatures were warmer than average for parts of northern Australia, much of Tasmania, and in a large area extending north from western Victoria and eastern South Australia, through western New South Wales and into southwestern Queensland. Minima were in the highest 10% of historical observations (decile 10) for small areas in the northern part of the Northern Territory, southwestern Victoria, and northwestern Tasmania.

Minimum temperatures were below average across large parts of central Western Australia, in the far southwest and in southern areas to the east of Esperance and in small areas elsewhere across Australia, especially in a large area of Queensland inland from Rockhampton.


Areal average temperatures
Maximum Temperature Minimum Temperature Mean Temperature
Rank
(of 108)
Anomaly
(°C)
Comment Rank
(of 108)
Anomaly
(°C)
Comment Rank
(of 108)
Anomaly
(°C)
Comment
Australia 70 +0.28 64 −0.10 70 +0.09
Queensland 81 +0.72 58 −0.12 67 +0.30
New South Wales = 59 −0.11 71 +0.24 = 59 +0.07
Victoria 73 +0.48 89 +0.66 = 84 +0.57
Tasmania 91 +0.78 = 80 +0.31 89 +0.54
South Australia 52 −0.08 70 +0.04 = 65 −0.01
Western Australia = 57 +0.15 44 −0.33 53 −0.08
Northern Territory = 73 +0.43 54 −0.11 68 +0.16

Rank ranges from 1 (lowest) to 108 (highest). A rank marked with ’=‘ indicates the value is tied for that rank. Anomaly is the departure from the long-term (1961–1990) average.


Temperature maps
MeanAnomalyDeciles
Mean
daily
maximum
temperatures
Map of mean daily maximum temperature Map of mean daily maximum temperature anomalies Map of mean daily maximum temperature deciles
Mean
daily
minimum
temperatures
Map of mean daily minimum temperature Map of mean daily minimum temperature anomalies Map of mean daily minimum temperature deciles
Mean
daily
temperatures
Map of mean daily temperature Map of mean daily temperature anomalies Map of mean daily temperature deciles

Rainfall

Nationally, rainfall for Australia during April was somewhat below average. However, this disguises marked differences in the rainfall received over different parts of the country.

April rainfall was above to very much above average in the far north of the Northern Territory and in a band extending from northwestern Western Australia, down through South Australia into western parts of New South Wales and Victoria. Monthly rainfall was in the highest 10% of historical observations (decile 10) over a large part of South Australia, some western parts of New South Wales and Victoria, east central Western Australia and the far northern parts of the Northern Territory and Queensland. South Australian rainfall was the tenth wettest on record for April with a large area receiving more than 400% of the April average.

April rainfall was below to very much below average for southwest Western Australia, central and eastern parts of the Northern Territory, much of central and eastern Queensland, large parts of Tasmania; and scattered areas in central and eastern New South Wales. Monthly rainfall was in the lowest 10% of historical observations (decile 1) over western Tasmania, large parts of central to eastern Queensland, the southwestern coast of Western Australia, and scattered areas in the Northern Territory.


Area-average rainfall
Rank
(of 118)
Average
(mm)
Departure
from mean
Comment
Australia 57 25.5 −17%
Queensland 23 11.8 −72%
New South Wales 51 27.5 −41%
Victoria 101 77.1 +51%
Tasmania 19 67.4 −40%
South Australia 109 32.6 +100% 10th highest
Western Australia 72 22.8 +9%
Northern Territory 79 31.1 +12%
Murray-Darling Basin 65 27.8 −27%

Rank ranges from 1 (lowest) to 118 (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.


Rainfall maps
TotalsPercentagesDeciles
Total
rainfall
Map of total rainfall Map of percentage of normal rain Map of rainfall deciles


Australian weather extremes during April 2017
Hottest day 40.2 °C    at Carnarvon Airport (WA) on the 10th
Coldest day −0.8 °C    at Mount Hotham (Vic.) on the 26th
Coldest night −6.1 °C    at Thredbo AWS (NSW) on the 27th
Warmest night 28.8 °C    at Troughton Island (WA) on the 3rd
Wettest day 222.4 mm at Warruwi Airport (NT) on the 11th


Notes

The Monthly 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 1 pm EST on Monday 3 April 2017. 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 October 2009; the main effect was that current and historical values for Tasmania were increased. Since October 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.


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