Melbourne Metropolitan Area in September 2011: Warm days

  • Average maximum temperatures warmer than usual
  • Average minimum temperatures close to normal
  • Rainfall totals close to normal.

Rainfall

Rainfall totals for September were generally close to normal. The driest station was Avalon Airport in the west which recorded 39.8 mm over 13 rain days. To contrast, in the east, Coldstream recorded the largest total with 103.2 mm over 12 rain days. The wettest single day was the 29th when Melbourne Airport recorded 51.6 mm. Some sites had their highest September daily rainfall on record.

Maximum temperature

Average daytime temperatures were warmer than usual for September. The hottest day was the 19th when Avalon Airport recorded 29.2 C and the warmest days on average were recorded at Melbourne Regional Office with 19.4 C. The coolest days on average, 17.7 C, were recorded at both Cerberus and Cranbourne Botanic Gardens. The coldest day was the 9th when Coldstream recorded 12.1 C. Some sites had their highest September temperature on record.

Minimum temperature

Average minimum temperatures were generally close to normal for September. A majority of stations recorded average minimum temperatures that were within 0.5 C of their respective long-term means. The coldest night was the 15th when Coldstream recorded 0.3 C, Coldstream also recorded the coolest nights on average with 5.7 C. The warmest nights on average were recorded at Melbourne Regional Office with 9.8 C and the warmest night was the 4th when Moorabbin Airport recorded 16.7 C.

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Extremes in September 2011
Hottest day 29.2 C at Avalon Airport on the 19th
Warmest days on average 19.4 C at Melbourne Regional Office
Coolest days on average 17.7 C at Cerberus
17.7 C at Cranbourne Botanic Gardens
Coldest day 12.1 C at Coldstream on the 9th
Coldest night 0.3 C at Coldstream on the 15th
Coolest nights on average 5.7 C at Coldstream
Warmest nights on average 9.8 C at Melbourne Regional Office
Warmest night 16.7 C at Moorabbin Airport on the 4th
Warmest on average overall 14.6 C at Melbourne Regional Office
Coolest on average overall 11.8 C at Coldstream
Wettest overall 103.2 mm at Coldstream
Driest overall 39.8 mm at Avalon Airport
Wettest day 51.6 mm at Melbourne Airport on the 29th
Highest wind gust 89 km/h at Melbourne Airport on the 19th

Record highest September daily rainfall
Highest daily rainfall
in September 2011 (mm)
Previous wettest
for September
Years of
record
Melbourne Airport 51.6 on the 29th 38.0 on the 15th in 1993 42



Record highest September temperature
Highest temperature
in September 2011 (C)
Previous warmest
for September
Years of
record
Average for
September
Cerberus 28.9 on the 19th 28.3 on the 19th in 2006 20 16.2



Summary statistics for September 2011
Maximum temperatures
for September
(C)
Minimum temperatures
for September
(C)
Rainfall
for September
(millimetres)
Mean for
September
2011
Diff
from
average
Highest for
September
2011
Mean for
September
2011
Diff
from
average
Lowest for
September
2011
Total for
September
2011
Average
for
September
Rank of
September
2011
Fraction of
September
average
East Central (district 86)
Bundoora (Latrobe University) 18.4 +1.6 27.0 19th 7.6 +0.4 1.9 8th 69.8 59.2 average 118%
Cerberus 17.7 +1.5 28.9 19th 7.5 0.0 0.8 8th 57.4 66.1 average 87%
Coldstream 17.9 +0.8 26.7 19th 5.7 +0.2 0.3 15th 103.2 71.5 high 144%
Cranbourne Botanic Gardens 17.7 +1.4 27.6 19th 7.6 -0.1 3.3 2nd 71.5 85.3 average 84%
Essendon Airport 18.7 +2.1 27.7 19th 7.6 +1.0 1.6 8th 71.0 51.1 high 139%
Melbourne Airport 18.4 +1.9 27.1 19th 7.2 +0.2 2.6 8th 76.0 46.9 high 162%
Melbourne Regional Office 19.4 +2.2 28.3 19th 9.8 +1.8 5.4 8th 73.6 58.1 high 127%
Moorabbin Airport 18.3 +1.5 28.4 19th 8.6 +0.7 3.5 26th 80.4 65.9 average 122%
Scoresby Research Institute 18.0 +1.6 27.1 19th 7.5 0.0 2.5 8th 91.4 84.7 average 108%
Viewbank (ARPANSA) 18.5 +0.9 27.9 19th 7.9 +0.2 1.8 15th 82.6 56.1 high 147%
West Central (district 87)
Avalon Airport 18.9 +1.3 29.2 19th 6.6 0.0 0.8 8th 39.8 45.9 average 87%
Laverton RAAF 18.7 +1.8 27.8 19th 7.1 +0.5 1.6 8th 42.8 49.5 average 86%

Notes

A Monthly Climate Summary is prepared to list the main features of the weather in Melbourne Metropolitan Area and Environs 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 9 am on Monday 3 October 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 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.

Further information

Media
(03) 9669 4057
Enquiries