Greater Adelaide in autumn 2018: Warm with below average rainfall

Rainfall was below average in Greater Adelaide during autumn 2018, continuing the generally below average rainfall experienced since the start of the year. Both daytime and nighttime temperatures were well above average.

Below average rainfall

  • Rainfall was below average for autumn 2018, with a closer to average May not enough to offset below average rainfall reported in March and April
  • Rainfall totals were mostly below 100 mm in the Adelaide Plains, reaching the 150 mm to 200 mm range in the Hills
  • Uraidla reported the highest autumn total rainfall with 212.0 mm, as well as the highest daily total with 48.0 mm in the 24 hours to 9am on 4 May

Above average temperatures

  • Both daytime and nighttime temperatures were well above average, largely due to a warm March and very warm April
  • Maximum temperatures were well above average across Greater Adelaide, ranging from 0.7 °C above average at Noarlunga to 2.9 °C above average at Mount Lofty.
  • Adelaide (Kent Town) had a total of twenty days of 30 °C or more (ten in March and ten in April) breaking the Adelaide city autumn record of nineteen for counts of such days in 1986; Adelaide (West Terrace / ngayirdapira) reported nineteen days of 30 °C or more (nine in March and ten in April)
  • Both Adelaide city sites had a run of five consecutive days of 30 °C or above from 19 April to 23 April, the latest such a run of days has occurred in the year. The pevious latest run of at least five consecutive 30 °C days ended on 21 April at the old West Terrace site in both 1919 and 1902)
  • Minimum temperatures ranged from 0.2 °C below average at Rosedale to 2.1 °C above average at Mount Barker
  • Adelaide (West Terrace / ngayirdapira)

    • Total rainfall for Adelaide (West Terrace / ngayirdapira) was 81.2 mm, which is 60% of the long-term average of 136.1 mm
    • The mean daily maximum temperature for Adelaide (West Terrace / ngayirdapira) was 24.0 °C, which is 1.8 °C above the long-term average of 22.2 °C. The warmest day was 36.3 °C on 11 Apr, and the coolest day was on 17 May when the temperature reached 15.2 °C
    • The mean daily minimum temperature for Adelaide (West Terrace / ngayirdapira) was 14.0 °C, which is 1.2 °C above the long-term average of 12.8 °C. The coldest morning was 4.8 °C on 16 May, and the warmest morning was on 9 Mar when the minimum temperature was 24.1 °C

    Further information

    Media
    (03) 9669 4057
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    Extremes in autumn 2018
    Hottest day 38.2 °C at Edinburgh RAAF on 11 Apr
    38.2 °C at Parafield Airport on 11 Apr
    Warmest days on average 24.8 °C at Parafield Airport
    Coolest days on average 18.6 °C at Mount Lofty
    Coldest day 8.6 °C at Mount Lofty on 10 May
    Coldest night 1.2 °C at Rosedale (Turretfield Research Centre) on 14 May
    Coolest nights on average 10.3 °C at Mount Lofty
    Warmest nights on average 14.3 °C at Noarlunga
    Warmest night 24.7 °C at Mount Crawford AWS on 10 Apr
    Warmest on average overall 19.1 °C at Adelaide (West Terrace / ngayirdapira)
    Coolest on average overall 14.5 °C at Mount Lofty
    Wettest overall 212.0 mm at Uraidla
    Wettest day 48.0 mm at Uraidla on 4 May
    Strongest wind gust 106 km/h at Mount Crawford AWS on 14 Apr

    Summary statistics for autumn 2018
    Maximum temperatures
    (°C)
    Minimum temperatures
    (°C)
    Rainfall
    (millimetres)
    Mean for
    autumn
    2018
    Diff
    from
    average
    Highest for
    autumn
    2018
    Mean for
    autumn
    2018
    Diff
    from
    average
    Lowest for
    autumn
    2018
    Total for
    autumn
    2018
    Average
    for
    autumn
    Rank of
    autumn
    2018
    Fraction of
    autumn
    average
    Adelaide (Kent Town) 24.2 +1.5 36.9 11 Apr 13.7 +1.0 5.8 16 May 95.8 126.8 low 76%
    Adelaide (West Terrace / ngayirdapira) 24.0 +1.8 36.3 11 Apr 14.0 +1.2 4.8 16 May 81.2 136.1 low 60%
    Adelaide Airport 23.4 +1.3 36.2 9 Mar 13.8 +1.8 5.2 16 May 49.8 109.4 low 46%
    Edinburgh RAAF 24.6 +1.5 38.2 11 Apr 12.6 +0.8 2.7 16 May 61.2 99.8 low 61%
    Kuitpo Forest Reserve 20.8 +1.1 33.6 11 Apr 12.0 +0.8 5.9 16 May 126.2 175.8 low 72%
    Mount Barker 22.5 +1.9 36.0 10 Apr 10.6 +2.1 3.7 16 May 142.4 176.6 average 81%
    Mount Crawford AWS 20.7 +1.5 33.6 10 Apr 11.1 +0.7 3.4 16 May 104.8 141.8 low 74%
    Mount Lofty 18.6 +2.9 31.0 11 Apr 10.3 +0.7 2.9 16 May 175.2
    Noarlunga 22.9 +0.7 35.5 9 Mar 14.3 +0.7 5.9 16 May 60.6 106.0 v low 57%
    Parafield Airport 24.8 +1.9 38.2 11 Apr 12.5 +0.6 2.1 16 May 66.4 108.8 low 61%
    Rosedale (Turretfield Research Centre) 24.6 +1.5 37.8 9 Apr 10.6 -0.2 1.2 14 May 75.7 110.0 low 69%

    Notes

    The Seasonal climate summary, generally published on the first working day of each month, lists the main features of the weather in Greater Adelaide using the most timely and accurate information available on the date of publication; it will generally not be updated. More extensive discussion of significant weather events, along with later information and data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.

    In September 2017 this summary was broadened to include data from observing sites in or near the Greater Adelaide “Greater Capital City Statistical Area” (GCCSA). The Australian Bureau of Statistics designed the GCCSAs to “include the population within the urban area of the city, as well as people who regularly socialise, shop or work within the city, and live in small towns and rural areas surrounding the city. It is important to note that GCCSAs do not define the built up edge of the city. They provide a stable definition for these cities and are designed for the output of a range of social and economic survey data.

    This statement has been prepared based on information available at 10 am on Friday 1 June 2018. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

    In some situations, some or all of the rainfall is in the form of hail or snow. In these cases the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.

    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.

    Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.

    Further information

    Media
    (03) 9669 4057
    Enquiries