Adelaide Metro & Hills in July 2011: Warmer and drier than average

  • Near to below average rainfall across the Adelaide region.
  • Despite bursts of cold conditions mid month, warmer than average temperatures for the month as a whole.
  • Winter and growing season (April to October ) rainfall so far are tracking below average.

Rainfall

The total rainfall recorded in Adelaide (Kent Town) for July 2011 was 61.4mm recorded on 15 days, as against the long term average of 75.4 mm on 17 days. The record lowest July rainfall for the complete Adelaide rainfall record was recorded in 1899 with 10.1mm. Last July, 59.8mm was recorded at Kent Town.

Note that the readings used here for climate records are from the manual Kent Town gauge. Some Adelaide rainfall totals on some web pages may differ as they are from automatic rainfall recordings.

Rainfall totals elsewhere over the metropolitan and hills area were generally below the long-term July average, with rainfall totals on the Adelaide plains typically between 30 mm and 60 mm, increasing up to 100mm in the Mt Lofty Ranges, with totals typically ~80% of average for this month. Some stations in the southern Adelaide Hills had higher than average July rainfall totals, with the highest July rainfall total being 161.4mm at Aldgate Creek.

98.6mm has been recorded in Adelaide (Kent Town) this winter so far, which is 124.2mm below the long-term winter average of 222.8mm, and 56.0mm below the average for June to July rainfall. This year so far 312.6mm has been recorded in Adelaide (Kent Town), with the long-term average being 314.8mm for the same period. Growing season ( April to October ) rainfall so far, is also below average across the Adelaide and Hills region.

One site had its warmest July night (highest daily minimum temperature) on record.

Temperature

Despite a run of cooler than average temperatures mid-month, a warm burst of temperatures in the last week left maximum temperatures slightly warmer than the long-term July average across the Adelaide metro and hills area. Temperatures were within 1 degree of the long term average.

The mean maximum temperature recorded at Adelaide (Kent Town) for July 2011 was 15.6 C, which is 0.3C above the long-term mean maximum temperature of 15.3C. Last year, the mean maximum temperature was 15.4C. Of the last 10 July's at the Kent Town site only 2 have been cooler than average, with 8 average or warmer than average. The last cooler than average July was in 2008 with an average of 14.8C.

The hottest maximum temperature recorded in the Adelaide metropolitan and hills area in July 2011, was 22.5 C, recorded at Adelaide Airport on the 1st , with the coldest day being recorded at Mount Lofty with 5.8C on the 12th, with Adelaide ( Kent Town) having its coldest day in July 2011 with 11.4C on the same day.

Mean minimum temperatures were closer to average, though still generally warmer than average, with the mean minimum temperature at Adelaide (Kent Town) for July being 7.9C, which is 0.4C above the average monthly mean minimum temperature of 7.5 C. The lowest recorded average minimum temperature of 4.8 C was recorded at the Adelaide (West Terrace) site in 1899. Last year the July mean minimum temperature was 6.8C. Adelaide(Kent Town) recorded the warmest July night on record for this site with 15.5C on the 1st, though when looking across the complete Adelaide record the warmest July night is 17.0C on the 24th July 1908 at the West Tce site.

The coldest minimum temperature recorded in the Adelaide metropolitan and hills area was -2.5C on the 22nd at Mount Barker. This was a particularly frosty night with several centres in the Adelaide region recording temperatures below freezing in an event which would be expected to be seen about once every 3 to 4 years on average. The warmest night was 15.5 C recorded at Adelaide(Kent Town) on the 1st.

Further information

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Extremes in July 2011
Hottest day 22.5 °C at Adelaide Airport on the 1st
Warmest days on average 15.9 °C at Parafield Airport
Coolest days on average 9.7 °C at Mount Lofty
Coldest day 5.8 °C at Mount Lofty on the 12th
Coldest night -2.5 °C at Mount Barker on the 22nd
Coolest nights on average 5.1 °C at Mount Lofty
Warmest nights on average 8.5 °C at Noarlunga
Warmest night 15.5 °C at Adelaide (Kent Town) on the 1st
Warmest on average overall 11.8 °C at Adelaide (Kent Town)
11.8 °C at Noarlunga
Coolest on average overall 7.4 °C at Mount Lofty
Wettest overall 161.4 mm at Aldgate Creek
Highest wind gust 72 km/h at Edinburgh RAAF on the 6th

Record highest July daily minimum temperature
Highest daily minimum
temperature
in July 2011 (°C)
Previous warmest
for July
Years of
record
Average for
July
Adelaide (Kent Town) 15.5 on the 1st 15.2 on the 30th in 1993 35 7.5



Summary statistics for July 2011
Maximum temperatures
for July
(°C)
Minimum temperatures
for July
(°C)
Rainfall
for July
(millimetres)
Mean for
July
2011
Diff
from
average
Highest for
July
2011
Mean for
July
2011
Diff
from
average
Lowest for
July
2011
Total for
July
2011
Average
for
July
Rank of
July
2011
Fraction of
July
average
Adelaide (Kent Town) 15.6 +0.3 22.2 1st 7.9 +0.4 1.3 22nd 61.4 75.0 low 82%
Adelaide Airport 15.5 +0.6 22.5 1st 7.1 +0.1 0.1 22nd 53.4 59.3 average 90%
Edinburgh RAAF 15.4 +0.2 21.7 1st 6.0 0.0 -1.0 22nd 48.6 52.8 average 92%
Mount Barker 13.2 +0.3 19.4 1st 5.4 +0.9 -2.5 22nd 116.2 106.0 average 110%
Mount Lofty 9.7   15.9 1st 5.1   1.1 22nd 134.4
Noarlunga 15.2   22.1 1st 8.5   3.3 16th 60.6
Parafield Airport 15.9 +0.8 22.2 1st 6.0 -0.3 -0.9 16th 44.2 58.6 average 75%

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 12 pm on Monday 1 August 2011. 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