Adelaide Metro & Hills in October 2012: Dry and warm conditions persist across the Adelaide region

  • Rainfall was very much below average across the Adelaide region with many locations receiving less than half of the long term October average.
  • Adelaide observed its driest October in 3 years.
  • Despite very cold temperatures in the second week of October which resulted in a rare snow event, daytime temperatures were in excess of 1C above average while night time temperatures were near average.
  • Adelaide's warmest October days in 4 years.

Rainfall

The October 2012 rainfall total at Adelaide (Kent Town) was 20.0mm received on 5 rain days. This is less that half of the long term average of 43.8 mm received on 10 or more rain days, and results in the driest October in the Adelaide region since 2009 when only 18.4 mm was observed. The long term median October rainfall for Adelaide (Kent Town) is 37.0 mm, last time exceeded in October 2011 when 42.6 mm was observed. The driest October at Adelaide (Kent Town) was observed in 2006 when just 1.0mm was recorded.

Most of the rainfall during October for the Adelaide and Hills region, was observed in just one day. On the 10th, a strong cold frontal system and associated cold air mass moved over South Australia which resulted in heavy showers, snow fall and hail in several locations about the Adelaide and Mt Lofty Ranges. Adelaide (Kent Town) recorded 16.4 mm to 9am on the 11th as a result of this event; Kuitpo Forest Reserve was the wettest overall this day with 29 mm.

Most locations received less than half of the long term October average with monthly rainfall totals typically ranging between 10 to 20mm on the Adelaide Plains, with higher totals in the 30 to 40mm range throughout the Adelaide Hills. The wettest location across the region was at Kuitpo Forest Reserve where 40.0 mm was recorded for the month.

Note that the Adelaide official climate rainfall record is taken from the manually observed 203mm rain gauge at the Kent Town site in Adelaide. These figures may differ from totals on some Bureau of Meteorology web pages as these may be from automatic tipping bucket rain gauge readings.

Temperature

The average maximum temperature recorded at Adelaide (Kent Town) for October 2012 was 23.1C, 1.3C above the long term average October maximum temperature resulting in the warmest October since 2008 when the average maximum temperatures were 24.1°C. By comparison, October 2011 saw average maximum temperatures of 22.1C at Adelaide (Kent Town). The record warmest October average maximum in Adelaide is 26.8C, observed in 1914 at the West Terrace site.

Several warm periods contributed to the warmer than average October, as high pressure systems, clear skies and above average sunshine hours dominated the weather throughout the month. The hottest day for any location across the Adelaide and Hills region was reported at Edinburgh RAAF where the maximum reached 34.3C on the 30th. Parafield Airport reported the warmest days on average, with a monthly average of 23.7 C, which is 2.0 C above the long term average for this site.

Daytime temperatures in the Adelaide region were coolest on the 10th and 11th owing to a pool of cold air associated with the strong cold frontal system, resulting in very much below average temperatures with snow across parts of the Adelaide Hills. The coldest day of the month for any location in the Adelaide and Hills region was reported at Mount Lofty on the 11th when the maximum reached 7.8 C. The coolest days on average were at Mount Lofty where the October maximum temperature averaged 17.5 C.

Mean minimum temperatures were generally below average across the Adelaide Plains and Hills this October. The minimum temperature at Adelaide (Kent Town) averaged 10.7C, 0.8 C below the long term October average. During October 2011, the minimum temperatures averaged 13.0 C. Reduced cloud cover can be attributed to the below average temperatures this October.

The coldest nights for most locations occurred through the second week of October as a high pressure system centred well south of South Australia directed a very cold airmass over the State.

The coldest minimum temperature during October 2012 in the Adelaide and Hills area was 0.4 C observed at Mount Lofty on the 11th and again on the 12th. The coolest nights on average were recorded at Mount Lofty with 7.7 C. Mount Barker observed an average October minimum of 8.1C, 0.7C above the long term October average for that site. The warmest night was observed at Kuitpo Forest Reserved and Noarlunga with 21.0C on the 31st. Noarlunga also recorded the warmest nights overall, with a monthly average of 11.0 C

 

Further information

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Extremes in October 2012
Hottest day 34.3 °C at Edinburgh RAAF on the 30th
Warmest days on average 23.7 °C at Parafield Airport
Coolest days on average 17.5 °C at Mount Lofty
Coldest day 7.8 °C at Mount Lofty on the 11th
Coldest night 0.4 °C at Mount Lofty on the 11th
0.4 °C at Mount Lofty on the 12th
Coolest nights on average 7.7 °C at Mount Lofty
Warmest nights on average 11.0 °C at Noarlunga
Warmest night 21.0 °C at Kuitpo Forest Reserve on the 31st
21.0 °C at Noarlunga on the 31st
Warmest on average overall 16.8 °C at Adelaide (Kent Town)
Coolest on average overall 12.4 °C at Mount Lofty
Wettest overall 40.0 mm at Kuitpo Forest Reserve
Driest overall 5.6 mm at Mount Crawford (Mt Crawford AWS)
Wettest day 29.0 mm at Kuitpo Forest Reserve on the 11th
Highest wind gust 83 km/h at Edinburgh RAAF on the 11th

 


Summary statistics for October 2012
Maximum temperatures
for October
(°C)
Minimum temperatures
for October
(°C)
Rainfall
for October
(millimetres)
Mean for
October
2012
Diff
from
average
Highest for
October
2012
Mean for
October
2012
Diff
from
average
Lowest for
October
2012
Total for
October
2012
Average
for
October
Rank of
October
2012
Fraction of
October
average
Adelaide (Kent Town) 23.1 +1.3 33.9 30th 10.7 -0.8 4.9 11th 20.0 43.8 low 46%
Adelaide Airport 21.8 +0.8 32.8 30th 9.6 -1.0 4.3 2nd 14.0 37.5 low 37%
Edinburgh RAAF 23.5 +1.5 34.3 30th 9.1 -0.9 3.1 7th 17.8 39.1 low 46%
Kuitpo Forest Reserve 19.3   29.9 30th 9.1   2.7 11th 40.0
Mount Barker 20.6 +1.2 31.1 30th 8.1 +0.9 2.7 11th 29.8 66.5 low 45%
Mount Crawford (Mt Crawford AWS) 19.5   30.5 30th 8.4   1.1 11th 5.6
Mount Lofty 17.5   27.5 30th 7.7   0.4 11th 28.4
Noarlunga 21.7   32.9 30th 11.0   5.4 11th 23.2
Parafield Airport 23.7 +2.0 34.2 30th 9.3 -0.8 2.6 7th 15.2 41.7 low 36%

 


Notes

A Monthly Climate Summary is prepared to list the main features of the weather in Adelaide Metro & Hills 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.

This statement has been prepared based on information available at 2 pm on Wednesday 31 October 2012. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Averages 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 20 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.

Further information

Media
(03) 9669 4057
Enquiries