Monday, 2 November 2009 - Monthly Climate Summary for Brisbane Metro - Product code IDCKGC14R0

Brisbane Metro in October 2009

An archive of previous monthly 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

Monthly rainfall totals from the six Brisbane metropolitan sites ranged from 36.3mm to 92.6mm. Only Redcliffe received above average rainfall for October, while the remaining sites recorded below the long term average.

Isolated showers and thunderstorms due to an upper trough over south east Queensland produced patchy thundery rain about the southern metropolitan area on the 11th. Logan City and Amberley recorded 11.7mm and 19mm respectively to 9am on the 12th.

Showers and gusty thunderstorms associated with a surface trough also occurred over the metropolitan area on the 13th, with small hail reported at some Brisbane suburbs and a maximum wind gust of 93km/hr was recorded at the Brisbane site.

On the evening of the 26th, the Brisbane metropolitan sites recorded around 20mm to 60mm of rainfall, making it the wettest day in the metropolitan area for October. These showers and thunderstorms were generated from the combination of a surface trough located from the Northern Territory to south east Queensland, and an upper level trough over the southern interior.

The remainder of the month was mostly fine, with a few isolated showers over the Brisbane metropolitan area, but no significant rainfall totals were recorded.

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

Temperature

Daytime temperatures were 1 to 2 °C above the long term October average at all the metropolitan stations. The highest temperature occurred on the 13th, with Archerfield recording 35.3 °C and Amberley recording 35.2 °C.

In contrast, overnight temperatures were around 1 °C below the long term average. Lack of cloud cover during the month contributed to these lower than expected minimum temperatures.

Maximum temperature

The hottest day was 35.3 °C at Archerfield Airport on the 13th, followed by 35.2 °C at Amberley AMO on the 13th.

The warmest days on average were 29.3 °C at Amberley AMO.

The coolest days on average were 26.1 °C at Redcliffe.

The coldest day was 20.7 °C at Logan City Water Treatment , followed by 20.9 °C at Redcliffe and then 21.2 °C at Amberley AMO, all on the 11th.

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

Minimum temperature

The coldest night was 5.1 °C at Amberley AMO on the 17th, followed by 5.5 °C at Amberley AMO on the 8th, followed by 6.8 °C at Amberley AMO on the 9th.

The coolest nights on average were 11.5 °C at Amberley AMO.

The warmest nights on average were 16.2 °C at Redcliffe.

The warmest night was 20.8 °C at Redcliffe on the 3rd.

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

Wind

The strongest wind gust was 93 km/h at Brisbane on the 13th, followed by 74 km/h at Archerfield Airport and 70 km/h at Brisbane Aero, both recorded on the 14th.

Other phenomena

Dust haze extended to the south east coast on the 14th, following the passage of a surface trough. Visibility was reduced to around 5km during the day.

Further information

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

Extremes

Hottest day
Highest temperature		 35.3 °C at Archerfield Airport on the 13th
Warmest days on average
Highest mean daily maximum temperature		 29.3 °C at Amberley AMO
Coolest days on average
Lowest mean daily maximum temperature		 26.1 °C at Redcliffe
Coldest day
Lowest daily maximum temperature		 20.7 °C at Logan City Water Treatment on the 11th
Coldest night
Lowest temperature		 5.1 °C at Amberley AMO on the 17th
Coolest nights on average
Lowest mean daily minimum temperature		 11.5 °C at Amberley AMO
Warmest nights on average
Highest mean daily minimum temperature		 16.2 °C at Redcliffe
Warmest night
Highest daily minimum temperature		 20.8 °C at Redcliffe on the 3rd
Wettest overall
Highest total rainfall		 92.6 mm at Redcliffe
Driest overall
Lowest total rainfall		 36.3 mm at Logan City Water Treatment
Wettest day
Highest daily rainfall		 62.0 mm at Redcliffe on the 27th
Highest wind gust
 93 km/h at Brisbane on the 13th

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Summaries

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

Summary statistics for October 2009
Maximum temperatures
for October
(°C)		 Minimum temperatures
for October
(°C)		 Rainfall
for October
(millimetres)
Mean for
October
2009		 Diff
from
average		 Highest for
October
2009		 Mean for
October
2009		 Diff
from
average		 Lowest for
October
2009		 Total for
October
2009		 Average
for
October		 Rank of
October
2009		 Fraction of
October
average
Moreton South Coast (district 40)
Amberley AMO 29.3 +1.6 35.2 13th 11.5 -1.9 5.1 17th 41.0 73.7 low 56%
Archerfield Airport 28.1 +1.2 35.3 13th 13.7 -0.6 8.5 8th 43.6 77.2 low 56%
Brisbane* 27.8 +1.7 35.0 13th 15.6 -0.2 11.8 8th 57.4 75.4 average 76%
Brisbane Aero 26.7 +1.3 34.8 3rd 14.7 -1.1 9.8 8th 59.0 64.9 average 91%
Logan City Water Treatment 27.8 +1.5 35.0 3rd 14.3 -0.5 9.6 8th 36.3 58.6 low 62%
Redcliffe* 26.1  +0.9 34.7 3rd 16.2 -0.3 12.2 8th 92.6 70.4 high 132%

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Notes

This statement has been prepared based on information available at 7 am on Monday 2 November 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 10 years of record, as they cannot then be calculated reliably.  *In this case, averages from a nearby suitable site have been used instead (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