Adelaide Metro & Hills in May 2013: A warm finish to autumn, with near average rainfall

This statement was prepared on the afternoon of the 31st May 2013 before all maximum temperature data for the period were available. This may affect some of the statistics presented.
  • Very much hotter than average to start with, resulting in May temperatures 1 to 2 C above average.
  • Record hottest May days were recorded at several locations.
  • Hottest May for Adelaide in 92 years (since 1921), and third hottest on record.
  • Near average rainfall on the Adelaide plains, though drier than average in the Adelaide Hills.

Rainfall

The May 2013 rainfall total at Adelaide (Kent Town) was slightly below average, with 54.8 mm received on 13 rain days. This is compared to the long-term average of 60.0 mm on 14 rain days, with median rainfall being 60.8 mm. By comparison, during May 2012, 62.8 mm was recorded.

The wettest periods for the Adelaide and Hills region occurred mid-month with a significant cold frontal system producing much of the month's rainfall in a 5 day period, though the month ended part way through a significant rainfall event.

Rainfall totals for May 2013 typically ranged from 40 to 60mm across the Adelaide Plains with slightly higher totals of up to 80 mm observed in the Hills. The wettest location for the month was at Crafers in the Adelaide Hills where 94.2 mm was recorded for the month, most of that occurring mid- month. This is the lowest May rainfall recorded at that site since observations commenced in 2005.

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.

Some sites had their lowest total 1 May to 31 May rainfall for at least 25 years.

Temperature

The first half of the month was very much warmer than average for daytime temperatures, and minimum temperatures remained consistently warmer than average for the whole month, and both ended up 1 to 2 C above average across the month.

The mean temperature for the month (the combination of maximum and minimum temperature) was the third hottest on record for Adelaide, since temperature observations began in 1887, and the warmest in 92 years, after 1921, and 1918.

The coldest period, with respect to daytime temperatures, occurred on the 22nd following the passage of a cold frontal system. The coldest nights occurred in the last week as a high pressure system maintained mostly fine and clear conditions across the State.

The average maximum temperature recorded at Adelaide (Kent Town) for May 2013 was 20.6 C, 1.7C above the long-term mean maximum temperature of 18.9C. In comparison, May 2012 averaged 18.2C for May maximum temperature at Adelaide (Kent Town). The record highest May mean maximum in Adelaide is 22.0C set in 1934 at the West Terrace site.

The coldest day in the region in May 2013 was reported at Mount Lofty on the 22nd when the maximum reached 9.4 C, and Adelaide (Kent Town) also recorded the coldest day for the month, a maximum of 15.2 C, on this day.

The hottest day across the Adelaide and Hills region was reported at Edinburgh RAAF with a maximum of 31.2 C on the 8th. The warmest days on average for the month were at Parafield Airport with monthly average maximum temperatures of 20.9 C.

Minimum temperatures were between 1 to 2 C warmer than average throughout the month. The mean minimum temperature for May 2013 at Adelaide (Kent Town) was 12.3 C, 2.0 C warmer than the long term May average of 10.3 C. This is the warmest May nights for Adelaide since 2007. By comparison, May 2012 saw minimum temperature for the month averaging 9.3 C.

The coldest minimum temperature recorded during May 2013 in the Adelaide and Hills area was 3.8 C on the 18th at Mt Barker, whilst the coolest nights on average were recorded at Mount Barker were nights averaged 8.9 C. The warmest night was 22.5C at Noarlunga on the 10th. Noarlunga also recorded the warmest nights on average with a monthly average 13.0 C

Some sites had their highest 1 May to 31 May temperature on record.
Some sites had their warmest 1 May to 31 May night (highest daily minimum temperature) on record.
Some sites had their highest 1 May to 31 May mean daily minimum temperature on record.

Other phenomena

Some other things happened too, and they are mentioned here.

Further information

Media
(03) 9669 4057
Enquiries

Extremes in May 2013
Hottest day 31.2 °C at Edinburgh RAAF on the 8th
Warmest days on average 21.0 °C at Parafield Airport
Coolest days on average 14.8 °C at Mount Lofty
Coldest day 9.4 °C at Mount Lofty on the 22nd
Coldest night 3.8 °C at Mount Barker on the 18th
Coolest nights on average 8.9 °C at Mount Barker
Warmest nights on average 13.0 °C at Noarlunga
Warmest night 22.5 °C at Noarlunga on the 10th
Warmest on average overall 16.5 °C at Noarlunga
Coolest on average overall 11.8 °C at Mount Lofty
Wettest overall 94.2 mm at Crafers (Mt Lofty)
Driest overall 1.4 mm at Hahndorf
Wettest day 31.0 mm at Inglewood on the 14th
Highest wind gust 67 km/h at Mount Crawford (Mt Crawford AWS) on the 2nd
67 km/h at Mount Crawford (Mt Crawford AWS) on the 11th

Lowest total May rainfall for at least 25 years
Total rainfall
for 1 May to 31 May 2013 (mm)
Most recent 1 May to 31 May
at least this dry
Years since
drier
Average for
1 May to 31 May
Hahndorf 1.4 0.3 in 1934* 78 96.2
Woodside 40.4 29.4 in 1976* 25 92.5

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




Record highest May temperature
Highest temperature
in 1 May to 31 May 2013 (°C)
Previous warmest
for 1 May to 31 May
Years of
record
Average for
1 May to 31 May
Adelaide Airport 30.4 on the 9th 29.2 on the 4th in 1967 59 18.6
Mount Barker 28.9 on the 8th 27.4 on the 3rd in 2002 57 16.6
Parafield Airport 31.1 on the 8th 30.4 on the 8th in 2002 56 18.9
Edinburgh RAAF 31.2 on the 8th 31.0 on the 4th in 2005 41 19.2
Adelaide (Kent Town) 31.1 on the 8th 29.2 on the 4th in 2005 37 19.0



Record highest May mean daily maximum temperature
Mean daily maximum
temperature
for 1 May to 31 May 2013 (°C)
Previous warmest
for 1 May to 31 May
Years of
record
Average for
1 May to 31 May
Adelaide Airport 20.7 20.4 in 2005 59 18.6



Record highest May daily minimum temperature
Highest daily minimum
temperature
in 1 May to 31 May 2013 (°C)
Previous warmest
for 1 May to 31 May
Years of
record
Average for
1 May to 31 May
Parafield Airport 20.9 on the 10th 19.7 on the 5th in 1990 55 9.4



Record highest May mean daily minimum temperature
Mean daily minimum
temperature
for 1 May to 31 May 2013 (°C)
Previous warmest
for 1 May to 31 May
Years of
record
Average for
1 May to 31 May
Adelaide (Kent Town) 12.3 12.1 in 2007 37 10.2
Edinburgh RAAF 11.5 11.2 in 1988 37 9.2

Highest May mean daily minimum temperature for at least 25 years
Mean daily minimum
temperature
for 1 May to 31 May 2013 (°C)
Most recent 1 May to 31 May
at least this warm
Years since
warmer
Average for
1 May to 31 May
Parafield Airport 11.4 11.6 in 1950* 45 9.4

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




Summary statistics for May 2013
Maximum temperatures
for 1 May
to 31 May
(°C)
Minimum temperatures
for 1 May
to 31 May
(°C)
Rainfall
for 1 May
to 31 May
(millimetres)
Mean for
1 May
to 31 May
2013
Diff
from
average
Highest for
1 May
to 31 May
2013
Mean for
1 May
to 31 May
2013
Diff
from
average
Lowest for
1 May
to 31 May
2013
Total for
1 May
to 31 May
2013
Average
for
1 May
to 31 May
Rank of
1 May
to 31 May
2013
Fraction of
1 May
to 31 May
average
Adelaide (Kent Town) 20.6 +1.7 31.1 8th 12.3 +2.1 6.7 24th 54.8 60.0 average 91%
Adelaide Airport 20.7 +2.1 30.4 9th 11.7 +2.2 5.7 24th 57.2 53.9 average 106%
Edinburgh RAAF 20.9 +1.7 31.2 8th 11.5 +2.3 5.0 24th 50.8 43.9 average 116%
Kuitpo Forest Reserve 17.8   27.9 9th 10.2   5.8 13th 73.8
Mount Barker 17.9 +1.3 28.9 8th 8.9 +2.0 3.8 18th 48.0 85.0 low 56%
Mount Crawford (Mt Crawford AWS) 16.6   26.8 8th 9.8   5.2 13th 71.2
Mount Lofty 14.8   24.5 8th 9.0   4.2 13th 87.4
Noarlunga 20.0   29.2 8th 13.0   8.6 18th 52.4
Parafield Airport 21.0 +2.1 31.1 8th 11.4 +2.0 4.3 24th 68.0 47.1 high 144%

Notes

This statement was prepared before all data for the period were available. This may affect some of the statistics presented.

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 3 pm on Friday 31 May 2013. 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.

The ACORN-SAT dataset is being used for temperature area averages from December 2012 onwards. The major change from earlier datasets is that the ACORN-SAT dataset commences in 1910, rather than 1950, and hence rankings are calculated using a larger set of years.

Further information

Media
(03) 9669 4057
Enquiries