Melbourne Metropolitan Area and Environs in June 2011: Rainfall less than that in most years

Highlights:

  • Overnight temperatures near to those in most years
  • Daytime temperatures slightly warmer than those in most years
  • Rainfall less than that in most years

Melbourne City

Located in the Central District at the head of Port Phillip Bay, Melbourne is Victoria's State Capital. Here, overnight minimum temperatures were slightly warmer than those usually experienced and averaged 7.8C (departure from normal 0.9C). That the overnight temperatures in Melbourne are higher than those in most surrounding localities is a consequence of the city being under the influence of the effect of urbanisation (cities are usually warmer than their rural surroundings, especially at night, because of heat stored in bricks and concrete and trapped between close-packed buildings). Daytime maximum temperatures were much warmer than those usually experienced and averaged 15.8C (departure from normal 1.8C). Total rainfall for the month was 32.2 mm, this being slightly less than that usually recorded (normal 49.0 mm, percentage of normal received 66%).

Suburbs

In the suburb of Essendon, which is located some 15 kilometres to the northwest of the city centre, overnight minimum temperatures were near to those usually experienced and averaged 6.1C (departure from normal 0.2C). Daytime maximum temperatures were warmer than those usually experienced and averaged 14.7C (departure from normal 1.1C). Total rainfall for the month was 23 mm, this being less than that usually recorded (normal 38.8 mm, percentage of normal received 59%).

The suburb of Laverton is located some 30 kilometres to the southwest of the city centre, and is often under the drying influence of the rain shadow from the ranges of western Victoria. Here, overnight minimum temperatures were near to those usually experienced and averaged 5.5C (departure from normal -0.3C). Daytime maximum temperatures were slightly warmer than those usually experienced and averaged 14.9C (departure from normal 0.7C). Total rainfall for the month was 24.2 mm, this being less than that usually recorded (normal 37.8 mm, percentage of normal received 64%).

In the suburb of Bundoora, which is located some 20 kilometres to the northeast of the city centre, overnight minimum temperatures were near to those usually experienced and averaged 5.9C (departure from normal -0.2C). Daytime maximum temperatures were slightly warmer than those usually experienced and averaged 14.5C (departure from normal 0.6C). Total rainfall for the month was 38.3 mm, this being slightly less than that usually recorded (normal 55.2 mm, percentage of normal received 69%).

In the suburb of Moorabbin, which is located some 20 kilometres to the southeast of the city centre, overnight minimum temperatures were near to those usually experienced and averaged 6.3C (departure from normal -0.4C). Daytime maximum temperatures were slightly warmer than those usually experienced and averaged 14.9C (departure from normal 0.7C). Total rainfall for the month was 38 mm, this being slightly less than that usually recorded (normal 55.4 mm, percentage of normal received 68%).

Some 20 kilometres northwest of the Melbourne city centre, and located in a somewhat rural setting, Melbourne Airport, is typical of the Central District. Here, overnight minimum temperatures were near to those usually experienced and averaged 6.2C (departure from normal 0C). Daytime maximum temperatures were warmer than those usually experienced and averaged 14.6C (departure from normal 1C). Total rainfall for the month was 19.8 mm, this being less than that usually recorded (normal 37.3 mm, percentage of normal received 52%).

Drivers

The powerful La Nia event of the past year or so has finally ended, and sea surface temperatures across the tropical Pacific Ocean have largely returned to normal (bringing an exceptionally wet period to a conclusion). The Southern Oscillation Index, which had been strongly positive during the La Nia event, is now also close to normal (zero). However, sea surface temperatures across waters to the south of the continent are mostly slightly above normal.

The pressure patterns during June were driven by a combination of strong high pressure systems over west Indian Ocean high latitudes and a trough of low pressure over Australian longitudes. This resulted in a series of fast moving frontal systems amplifying as they approached Western Australia, and then weakening before passing across southeastern Australia - hence, these were mostly not accompanied by very much rain falling in Victoria (but several of them retained sufficient strength to be associated with strong northerly winds ahead of their passage).

Further information

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Extremes in June 2011
Hottest day 20.9 C at Coldstream on the 1st
Warmest days on average 15.8 C at Melbourne Regional Office
Coolest days on average 10.2 C at Ferny Creek (Dunns Hill)
Coldest day 4.8 C at Ferny Creek (Dunns Hill) on the 7th
Coldest night -2.1 C at Coldstream on the 16th
Coolest nights on average 3.2 C at Coldstream
Warmest nights on average 7.8 C at Melbourne Regional Office
Warmest night 12.2 C at Melbourne Regional Office on the 3rd
Wettest overall 74.6 mm at Coldstream
Highest wind gust 102 km/h at Ferny Creek (Dunns Hill) on the 21st




Summary statistics for June 2011
Maximum temperatures
for June
(C)
Minimum temperatures
for June
(C)
Rainfall
for June
(millimetres)
Mean for
June
2011
Diff
from
average
Highest for
June
2011
Mean for
June
2011
Diff
from
average
Lowest for
June
2011
Total for
June
2011
Average
for
June
Rank of
June
2011
Fraction of
June
average
Avalon Airport 15.1 +0.3 20.5 2nd 5.2 -0.6 -1.3 1st 37.8 35.3 average 107%
Bundoora (Latrobe University) 14.5 +0.6 18.2 2nd 5.9 -0.2 0.7 16th 38.3 55.2 low 69%
Cerberus 14.4 +0.3 19.1 2nd 6.3 -0.5 0.3 16th 53.8 70.2 average 77%
Coldstream 14.6 +0.6 20.9 1st 3.2 -0.9 -2.1 16th 74.6 65.5 average 114%
Cranbourne Botanic Gardens 14.3 +0.3 19.0 2nd 5.9 -0.8 1.0 1st 64.9 76.4 average 85%
Essendon Airport 14.7 +1.1 18.6 2nd 6.1 +0.2 0.4 29th 23.0 38.8 low 59%
Ferny Creek (Dunns Hill) 10.2 +0.6 16.5 1st 5.6 -0.1 0.4 8th 73.2 90.4 average 81%
Laverton RAAF 14.9 +0.7 19.5 2nd 5.5 -0.3 -1.0 1st 24.2 37.8 low 64%
Melbourne Airport 14.6 +1.0 18.8 2nd 6.2 0.0 1.0 1st 19.8 37.3 low 53%
Melbourne Regional Office 15.8 +1.8 19.5 2nd 7.8 +0.9 3.4 1st 32.2 49.0 low 66%
Moorabbin Airport 14.9 +0.7 19.4 2nd 6.3 -0.4 0.7 29th 38.0 55.4 low 69%
Scoresby Research Institute 14.7 +1.2 19.2 1st 5.5 -0.8 0.8 1st 45.4 68.7 low 66%
Viewbank (ARPANSA) 14.8 +0.4 18.9 2nd 5.7 -0.7 0.9 16th 46.2 50.5 average 91%

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 10 am on Friday 1 July 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