Friday, 1 May 2009 - Monthly Climate Summary for Adelaide Metro & Hills - Product code IDCKGC23R0

Adelaide Metro & Hills in April 2009
Welcome Drenching Rain.

Summary

  • Near average temperature during the month.
  • Heavy rainfall toward end of April
  • April rainfall boosts year to date totals to almost average

An archive of previous monthly summaries for Adelaide Metro & Hills is also available, as are summaries for other states and many other climate summaries and diagnostics.

Rainfall

Some sites had their highest total April rainfall for at least 25 years.

Adelaide's (Kent Town) rainfall for April 2009 was 73.6 mm recorded on 7 days, which is very much above the long term average of 39.6 mm on 8 days. Over the metropolitan and hills areas the rainfall was mostly well above average. The highest rainfall total was 158.3 mm recorded at Piccadilly (Woodhouse) in the Adelaide Hills.

The 66.6 mm of rain recorded between the 24th and the 27th is the highest consecutive 4 day April total since 1948 at the South Australian Regional Office.

In comparison, April 2008 received a similar rainfall pattern very little during the first few weeks followed by substantial rain during the latter part of the month. Statistically the 25th of April, Anzac Day, has the highest probability during April that it will rain, near 50%. Anzac Day this year kept to tradition and rained!

Temperature

Overall the average temperature in the Adelaide metropolitan area was near average but the hills areas was about 1°C above the long term average.

The mean maximum temperature recorded at the South Australian Regional Office (Kent Town) for April 2009 was 22.8°C, which is 0.2°C above the long term April mean maximum temperature. This is comparable to April last year which was 22.7°C, the highest April mean maximum is 26.9°C in 1923. The hottest maximum temperature recorded in the Adelaide metropolitan and hills area was 34.7°C on the 1st at the Parafield Airport.

The mean minimum temperature for April 2009 at the South Australian Regional Office (Kent Town) was 13.0°C, which is 0.6°C above the normal April mean minimum temperature of 12.4°C. April's highest recorded average minimum temperature is 15.7°C in 1971. April, last year, the mean minimum temperature was 12.2°C. The coldest minimum temperature recorded in the Adelaide metropolitan and hills area was 4.7°C on the 29th at Mount Barker, whilst the warmest night was 21.3°C at the South Australian Regional Office (Kent Town) on the 23rd.

Further information

South Australian Regional Office
South Australian Climate Services Centre
Bureau of Meteorology
Phone (08) 8366 2600
Email climate.sa@bom.gov.au

Extremes

Hottest day
Highest temperature
34.7°C at Parafield Airport on the 1st
Warmest days on average
Highest mean daily maximum temperature
23.4°C at Parafield Airport
Coolest days on average
Lowest mean daily maximum temperature
21.8°C at Noarlunga
Coldest day
Lowest daily maximum temperature
13.9°C at Mount Barker on the 26th
Coldest night
Lowest temperature
4.7°C at Mount Barker on the 29th
Coolest nights on average
Lowest mean daily minimum temperature
9.0°C at Mount Barker
Warmest nights on average
Highest mean daily minimum temperature
13.8°C at Noarlunga
Warmest night
Highest daily minimum temperature
21.3°C at Adelaide (Kent Town) on the 23rd
Wettest overall
Highest total rainfall
158.3 mm at Piccadilly (Woodhouse)
Highest wind gust
91 km/h at Adelaide Airport on the 25th

Summaries

This table is very wide and may not fit if printed.

Summary statistics for April 2009
Maximum temperatures
for April
(°C)
Minimum temperatures
for April
(°C)
Rainfall
for April
(millimetres)
Mean for
April
2009
Diff
from
average
Highest for
April
2009
Mean for
April
2009
Diff
from
average
Lowest for
April
2009
Total for
April
2009
Average
for
April
Rank of
April
2009
Fraction of
April
average
Adelaide 22.9 +0.3 34.1 1st 13.0 +0.6 8.6 30th 73.6 39.6 high 186%
Adelaide Airport 22.2 +0.1 33.8 2nd 12.5 +0.8 8.0 10th 51.2 35.1 high 146%
Edinburgh RAAF 23.0 +0.1 34.4 2nd 12.3 +0.7 7.2 9th 57.4 31.5 high 182%
Mount Barker 22.0 +1.6 32.5 2nd 9.0 +0.7 4.7 29th 75.7 58.8 high 129%
Noarlunga 21.8   33.0 2nd 13.8   9.2 29th 70.2
Parafield Airport 23.4 +0.8 34.7 1st 11.7 −0.1 6.5 10th 84.2 40.1 very high 210%

Notes

This statement has been prepared based on information available at 4 pm on Friday 1 May 2009. 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

South Australian Regional Office
South Australian Climate Services Centre
Bureau of Meteorology
Phone (08) 8366 2600
Email climate.sa@bom.gov.au