Wednesday, 2 September 2009 - Seasonal Climate Summary for Brisbane Metro - Product code IDCKGC24R0

Brisbane Metro in winter 2009
A very hot, dry season

  • Record high winter daily maximum temperatures
  • Some record high winter daily minimum temperatures
  • 21% or less of long-term average rainfall

Information current at 1 September 2009

This statement was prepared using the most timely and accurate data available on 1 September 2009.  This document will not be updated.  Final values, which have had greater opportunity for data quality control, will be presented in the Monthly Weather Review, which is usually published during the fourth week of the month.  Further major quality control statements may also appear in Annual Climate Summaries.  Please note that there is no seasonal weather review product, however seasonal statistics can be obtained by combining statistics available in each month's weather review. 

An archive of previous seasonal summaries for Brisbane Metro is also available, as are summaries for other states and many other climate summaries and diagnostics.

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Rainfall

Overall during winter, average rainfall occurred in the metropolitan area, due to above average rainfall in June.  July and August were very dry months in the metropolitan area. While low rainfall is normal between July and September, this July and August have been particularly dry.   

The wettest overall in winter was 128.1 mm at Logan City Water Treatment, followed by 117.0 mm at Redcliffe, followed by 100.4 mm at Brisbane Aero.

The driest overall was 73.9 mm at Amberley AMO, followed by 95.2 mm at Brisbane City, followed by 99.0 mm at Archerfield Airport.

On the wettest single day 41.8 mm of rainfall was recorded at Logan City Water Treatment on 23 Jun, followed by 34.2 mm at Logan City Water Treatment on 22 Jun, followed by 34.2 mm at Archerfield Airport on 23 Jun, followed by 34.0 mm at Redcliffe on 23 Jun.  Much of the rainfall that occurred in the metropolitan area during winter was recorded between 9am on the 20th and 9am on the 23rd of June.  A rain band with isolated thunderstorms developed near the southeast coast on the 20th then spread slowly northwest. Rain areas increased on the 21st and 22nd as an upper trough approached from the west.  Flash flooding was reported at both Goodna and Nerang on the 22nd. 

See a map of total rainfall. See a map of rainfall deciles.

Temperature

The latest Special Climate Statement regarding exceptional winter heat is available here.

Maximum temperature

Close to average maximum temperatures in the metropolitan area in June and July were followed by record high August daily maximum temperatures, which resulted in the highest winter temperatures on record at all weather stations considered in this summary.

The hottest day during winter in the metropolitan area was 36.4 °C at Amberley AMO on 24 Aug, followed by 35.7 °C at Archerfield Airport on 24 Aug, followed by 35.4 °C at Brisbane City on 24 Aug.

The warmest days on average were 23.1 °C at Amberley AMO, followed by 22.8 °C at Brisbane City, followed by 22.7 °C at Logan City Water Treatment.

The coolest days on average were 21.7 °C at Redcliffe, followed by 22.0 °C at Brisbane Aero, followed by 22.6 °C at Archerfield Airport.

The coldest day was 15.6 °C at Amberley AMO on 7 Jul, followed by 15.9 °C at Redcliffe on 7 Jul, followed by 16.2 °C at Redcliffe on 11 Jun, followed by 16.2 °C at Brisbane Aero on 7 Jul.

See a map of mean maximum temperatures. See a map of maximum temperature anomalies.

Minimum temperature

Above average minimum temperatures in the metropolitan area in June were followed by close to average minimum temperatures in July.  In August all six sites in the Brisbane Metro area included in this summary had their warmest August night (highest daily minimum temperature) on record.  As a result, some sites had their warmest winter night (highest daily minimum temperature) on record.

The coldest night was -2.5 °C at Amberley AMO on 12 Jun, followed by 0.3 °C at Amberley AMO on 15 Jul, followed by 0.7 °C at Amberley AMO on 30 Jul.

The coolest nights on average were 6.4 °C at Amberley AMO, followed by 8.8 °C at Archerfield Airport, followed by 10.2 °C at Brisbane Aero.

The warmest nights on average were 11.7 °C at Redcliffe, followed by 11.2 °C at Brisbane City, followed by 10.9 °C at Logan City Water Treatment.

The warmest night was 20.2 °C at Redcliffe on 25 Aug, followed by 19.8 °C at Amberley AMO on 25 Aug, followed by 19.2 °C at Brisbane City on 29 Aug.

See a map of mean minimum temperatures. See a map of minimum temperature anomalies.

Wind

The strongest wind gust was 69 km/h at Brisbane Aero on 3 Jul, followed by 63 km/h at Archerfield Airport on 3 Jul, followed by 63 km/h at Redcliffe on 8 Jul, followed by 61 km/h at Amberley AMO on 3 Jul.

Other phenomena

A tornado was observed at Rosewood and Amberley on the 5th of June.

Further information

Queensland Climate Services Centre
Bureau of Meteorology
Phone (07) 3239 8700
Email climate.qld@bom.gov.au

Extremes

Hottest day
Highest temperature		 36.4 °C at Amberley AMO on 24 Aug
35.7 °C at Archerfield Airport on 24 Aug
35.4 °C at Brisbane on 24 Aug
Warmest days on average
Highest mean daily maximum temperature		 23.1 °C at Amberley AMO
22.8 °C at Brisbane
22.7 °C at Logan City Water Treatment
Coolest days on average
Lowest mean daily maximum temperature		 21.7 °C at Redcliffe
22.0 °C at Brisbane Aero
22.6 °C at Archerfield Airport
Coldest day
Lowest daily maximum temperature		 15.6 °C at Amberley AMO on 7 Jul
15.9 °C at Redcliffe on 7 Jul
16.2 °C at Redcliffe on 11 Jun
16.2 °C at Brisbane Aero on 7 Jul
Coldest night
Lowest temperature		 -2.5 °C at Amberley AMO on 12 Jun
0.3 °C at Amberley AMO on 15 Jul
0.7 °C at Amberley AMO on 30 Jul
Coolest nights on average
Lowest mean daily minimum temperature		 6.4 °C at Amberley AMO
8.8 °C at Archerfield Airport
10.2 °C at Brisbane Aero
Warmest nights on average
Highest mean daily minimum temperature		 11.7 °C at Redcliffe
11.2 °C at Brisbane
10.9 °C at Logan City Water Treatment
Warmest night
Highest daily minimum temperature		 20.2 °C at Redcliffe on 25 Aug
19.8 °C at Amberley AMO on 25 Aug
19.2 °C at Brisbane on 29 Aug
Wettest overall
Highest total rainfall		 128.1 mm at Logan City Water Treatment
117.0 mm at Redcliffe
100.4 mm at Brisbane Aero
Driest overall
Lowest total rainfall		 73.9 mm at Amberley AMO
95.2 mm at Brisbane
99.0 mm at Archerfield Airport
Wettest day
Highest daily rainfall		 41.8 mm at Logan City Water Treatment on 23 Jun
34.2 mm at Logan City Water Treatment on 22 Jun
34.2 mm at Archerfield Airport on 23 Jun
34.0 mm at Redcliffe on 23 Jun
Highest wind gust
 69 km/h at Brisbane Aero on 3 Jul
63 km/h at Archerfield Airport on 3 Jul
63 km/h at Redcliffe on 8 Jul
61 km/h at Amberley AMO on 3 Jul

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Records

Record highest winter temperature
Highest temperature
in winter 2009 (°C) 		Previous highest
for winter		 Years of
record		 Average for
winter
Amberley AMO 36.4 on 24 Aug 33.3 on 13 Aug 1946 69 21.8
Archerfield Airport 35.7 on 24 Aug 32.2 on 14 Aug 1946 35 21.6
Brisbane Aero* 33.7 on 25 Aug 28.7 on 10 Aug 1993 61 21.2
Brisbane* 35.4 on 24 Aug 32.8 on 14 Aug 1946 86 21.1
Logan City Water Treatment 34.3 on 24 Aug 29.2 on 22 Aug 1995  17 21.8
Redcliffe* 33.4 on 24 Aug        29.0 on 18 Aug 1992  22 21.2


Record highest winter daily minimum temperature
Highest daily minimum
temperature
in winter 2009 (°C) 		Previous highest
for winter		 Years of
record		 Average for
winter
Amberley AMO 19.8 on 25 Aug 17.8 on 19 Jun 1942 69 6.2
Brisbane* 19.2 on 29 Aug 19.0 on 1 Jun 1981 86 10.3
Redcliffe* 20.2 on 25 Aug            18.3 on 5 Jun 1988  22 11.0


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Summaries

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

Summary statistics for winter 2009
Maximum temperatures
for winter
(°C)		 Minimum temperatures
for winter
(°C)		 Rainfall
for winter
(millimetres)
Mean for
winter
2009		 Diff
from
average		 Highest for
winter
2009		 Mean for
winter
2009		 Diff
from
average		 Lowest for
winter
2009		 Total for
winter
2009		 Average
for
winter		 Rank of
winter
2009		 Fraction of
winter
average
Moreton South Coast (district 40)
Amberley AMO 23.1 +1.3 36.4 24 Aug 6.4 +0.2 -2.5 12 Jun 73.9 114.7 average 64%
Archerfield Airport 22.6 +1.0 35.7 24 Aug 8.8 +0.6 2.3 12 Jun 99.0 154.5 average 64%
Brisbane* 22.8 +1.7 35.4 24 Aug 11.2 +0.9 5.5 12 Jun 95.2 123.1 average 77%
Brisbane Aero 22.0 +0.7 33.7 25 Aug 10.2 +0.6 3.4 12 Jun 100.4 136.3 average 74%
Logan City Water Treatment 22.7 +0.9 34.3 24 Aug 10.9 +1.7 3.5 12 Jun 128.1 151.3 average 85%
Redcliffe* 21.7 +0.5 33.4 24 Aug 11.7 +0.7 4.6 12 Jun 117.0 151.8 average 77%

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Notes

This statement has been prepared based on information available at 10 am on Wednesday 2 September 2009. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Please note that the rainfall data from Bureau of Meteorology telemetry gauges (those with ALERT, AL or TM in their names) includes real-time operational data from automated systems and has not been checked.

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 10 years of record, as they cannot then be calculated reliably.  *In this case, normals from a nearby suitable site may be included to calculate statistics (these are marked with an *).

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

Queensland Climate Services Centre
Bureau of Meteorology
Phone (07) 3239 8700
Email climate.qld@bom.gov.au