Adelaide in winter 2015: below average temperatures and below average rainfall

Both maximum and minimum temperatures were cooler than average during winter, with the coolest days accompanied with rain from cold frontal systems and southwesterly airstreams. Rainfall was generally below average across Adelaide, with most locations across the region receiving 60 to 80% of their long term average.

  • Adelaide's driest winter since 2006
  • Cooler than average days
  • Cooler than average nights

The season started dry with very much below average rainfall throughout June. Rainfall tended near average in July, but again tended below average throughout August. This resulted in the driest winter since 2006 for Adelaide, and in the lowest 20% of winter rainfall totals since records began in 1839. In the hills, Nairne had its lowest total winter rainfall for at least 20 years.

Overall, the season was cooler than average, with both maximum and minimum temperatures tending below average across the region. At Kent Town, daytime temperatures averaged 15.5°C. The winter mean minimum temperature averaged 7.7°C. Throughout the season, there were 16 nights where the minimum temperatures dropped below 5.0°C, this is close to the average, despite the overall slightly colder than average temperatures. The coldest temperature recorded for Adelaide during winter was 1.8°C on 20 July which was the coldest July morning for the city in 4 years.

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Extremes in winter 2015
Hottest day 23.0 °C at Noarlunga on 20 Aug
Warmest days on average 15.7 °C at Parafield Airport
Coolest days on average 9.5 °C at Mount Lofty
Coldest day 5.3 °C at Mount Lofty on 11 Jul
Coldest night -1.7 °C at Mount Barker on 20 Jul
Coolest nights on average 4.7 °C at Mount Lofty
Warmest nights on average 8.3 °C at Noarlunga
Warmest night 13.4 °C at Noarlunga on 21 Aug
Warmest on average overall 11.6 °C at Adelaide (Kent Town)
11.6 °C at Noarlunga
Coolest on average overall 7.1 °C at Mount Lofty
Wettest overall 367.3 mm at Uraidla
Wettest day 40.0 mm at Piccadilly (Woodhouse) on 11 Jul
Strongest wind gust 96 km/h at Mount Crawford (Mt Crawford AWS) on 25 Jul


Lowest winter total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
winter
Nairne 164.4 99.8 in 1982* 270.1

* note: there are gaps in the historical record at this site, so it is possible a lower value has gone unreported.




Summary statistics for winter 2015
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
winter
2015
Diff
from
average
Highest for
winter
2015
Mean for
winter
2015
Diff
from
average
Lowest for
winter
2015
Total for
winter
2015
Average
for
winter
Rank of
winter
2015
Fraction of
winter
average
Adelaide (Kent Town) 15.5 -0.5 22.9 20 Aug 7.7 -0.3 1.8 20 Jul 137.4 222.3 v low 62%
Adelaide Airport 15.3 -0.3 22.6 20 Aug 7.6 +0.2 1.4 19 Jul 95.2 165.4 v low 58%
Edinburgh RAAF 15.5 -0.4 21.0 6 Jun 6.2 -0.2 -0.6 20 Jul 121.6 156.8 low 78%
Kuitpo Forest Reserve 12.3 -0.7 20.7 20 Aug 6.4 -0.6 0.6 20 Jul 270.0 305.0 average 89%
Mount Barker 13.8 +0.2 21.2 20 Aug 5.2 +0.3 -1.7 20 Jul 213.2 309.0 low 69%
Mount Crawford (Mt Crawford AWS) 11.0 -0.7 17.8 20 Aug 5.6 -0.5 1.2 20 Jul 188.2 262.7 low 72%
Mount Lofty 9.5 +0.3 16.7 20 Aug 4.7 -0.5 0.1 19 Jul 334.4
Noarlunga 14.9 -0.5 23.0 20 Aug 8.3 -0.7 2.9 20 Jul
Parafield Airport 15.7 0.0 21.7 20 Aug 6.0 -0.7 -0.3 11 Jun 121.0 166.2 low 73%

Notes

The Seasonal climate summary lists the main features of the weather in Adelaide 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.

A climate summary is generally published on the first working day of each month.

This statement has been prepared based on information available at 11 am 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.

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 rain.

The Rank indicates how rainfall this time compares with the climate record for the site, based on the decile ranking (very low rainfall 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 rain has fallen this time as a percentage of the long-term mean.

The ACORN-SAT dataset is used for temperature area averages.

Further information

Media
(03) 9669 4057
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