Melbourne Metropolitan Area and Environs in summer 2012-13:

Lengthy warm and sunny periods;

Rainfall slightly less than that usually received.

Melbourne CBD

Located in the Central District at the head of Port Phillip Bay, Melbourne is Victoria's State Capital. Here, overnight minimum temperatures were much warmer than those usually experienced and averaged 16.2C (departure from normal 2.3C). 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 27.4C (departure from normal 2.1C). Total rainfall for the past summer (Dec 2012 to Feb 2013) was 108 mm, this being slightly less than that usually recorded (normal 154.7 mm, percentage of normal received 70%).

Selected Melbourne suburbs

In the suburb of Essendon, which is located some 15 kilometres to the northwest of the city centre, overnight minimum temperatures were much warmer than those usually experienced and averaged 14.5C (departure from normal 1.6C). Daytime maximum temperatures were much warmer than those usually experienced and averaged 27.4C (departure from normal 2C). Total rainfall for the past summer (Dec 2012 to Feb 2013) was 85 mm, this being less than that usually recorded (normal 141.7 mm, percentage of normal received 60%).

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 slightly warmer than those usually experienced and averaged 14.1C (departure from normal 0.8C). Daytime maximum temperatures were much warmer than those usually experienced and averaged 26.4C (departure from normal 1.4C). Total rainfall for the past summer (Dec 2012 to Feb 2013) was 90 mm, this being slightly less than that usually recorded (normal 132.7 mm, percentage of normal received 68%).

In the suburb of Bundoora, which is located some 20 kilometres to the northeast of the city centre, overnight minimum temperatures were slightly warmer than those usually experienced and averaged 14.2C (departure from normal 0.7C). Daytime maximum temperatures were much warmer than those usually experienced and averaged 27.5C (departure from normal 1.5C). Total rainfall for the past summer (December 2012 to February 2013) was 110.7 mm, this being slightly less than that usually recorded (normal 156.3 mm, percentage of normal received 71%).

In the suburb of Moorabbin, which is located some 20 kilometres to the southeast of the city centre, overnight minimum temperatures were slightly warmer than those usually experienced and averaged 14.3C (departure from normal 0.7C). Daytime maximum temperatures were much warmer than those usually experienced and averaged 26.7C (departure from normal 1.6C). Total rainfall for the past summer (Dec 2012 to Feb 2013) was 100.2 mm, this being slightly less than that usually recorded (normal 151.0 mm, percentage of normal received 66%).

Some 20 kilometres northwest of the Melbourne city centre, and located in a somewhat rural setting, at Melbourne Airport, overnight minimum temperatures were slightly warmer than those usually experienced and averaged 13.8C (departure from normal 0.5C). Daytime maximum temperatures were much warmer than those usually experienced and averaged 27.7C (departure from normal 2C). Total rainfall for the past summer (Dec 2012 to Feb 2013) was 83.2 mm, this being less than that usually recorded (normal 134.3 mm, percentage of normal received 62%).

Records

Some sites had their highest summer mean daily maximum temperature for at least 10 years.


Extremes in summer 2012-13
Hottest day 43.0 C at Avalon Airport on 4 Jan 2013
Warmest days on average 28.4 C at Coldstream
28.4 C at Viewbank
Coolest days on average 24.9 C at Cerberus
Coldest day 16.0 C at Cranbourne Botanic Gardens on 4 Dec 2012
Coldest night 4.5 C at Coldstream on 30 Dec 2012
Coolest nights on average 11.2 C at Coldstream
Warmest nights on average 16.2 C at Melbourne Regional Office
Warmest night 26.0 C at Laverton RAAF on 24 Dec 2012
Warmest on average overall 21.8 C at Melbourne Regional Office
Coolest on average overall 19.1 C at Cerberus
Wettest overall 134.2 mm at Scoresby Research Institute
Highest wind gust 93 km/h at Melbourne Airport on 24 Dec 2012

Highest summer mean daily maximum temperature for at least 10 years
Mean daily maximum
temperature
for summer 2012-13 (C)
Most recent summer
at least this warm
Years since
warmer
Average for
summer
Coldstream 28.4 28.7 in 2000 12 26.7
Scoresby Research Institute 27.8 27.9 in 2000 12 25.5
Viewbank 28.4 28.8 in 2000 12 26.7



Summary statistics for summer 2012-13
Maximum temperatures
for summer
(C)
Minimum temperatures
for summer
(C)
Rainfall
for summer
(millimetres)
Mean for
summer
2012-13
Diff
from
average
Highest for
summer
2012-13
Mean for
summer
2012-13
Diff
from
average
Lowest for
summer
2012-13
Total for
summer
2012-13
Average
for
summer
Rank of
summer
2012-13
Fraction of
summer
average
Avalon Airport 26.8 +1.4 43.0 4 Jan 2013 13.4 0.0 7.1 22 Dec 2012 89.8 94.8 average 95%
Bundoora (Latrobe University) 27.5 +1.5 40.8 4 Jan 2013 14.2 +0.7 8.2 30 Jan 2013 110.7 156.3 average 71%
Cerberus 24.9 +1.1 40.7 4 Jan 2013 13.3 0.0 6.1 22 Dec 2012 106.4 131.8 average 81%
Coldstream 28.4 +1.7 40.1 17 Jan 2013 11.2 +0.1 4.5 30 Dec 2012 107.6 156.2 low 69%
Cranbourne Botanic Gardens 26.0 +1.2 39.5 17 Jan 2013 12.8 -0.3 6.8 22 Dec 2012 120.1 166.7 low 72%
Essendon Airport 27.4 +2.0 41.7 17 Jan 2013 14.5 +1.5 8.7 17 Dec 2012 85.0 141.7 low 60%
Laverton RAAF 26.4 +1.4 41.7 4 Jan 2013 14.1 +0.8 7.0 17 Dec 2012 90.0 132.7 low 68%
Melbourne Airport 27.7 +2.0 41.5 4 Jan 2013 13.8 +0.5 7.7 17 Dec 2012 83.2 134.3 low 62%
Melbourne Regional Office 27.4 +2.1 41.1 4 Jan 2013 16.2 +2.3 11.8 17 Dec 2012 108.0 154.7 average 70%
Moorabbin Airport 26.7 +1.6 41.5 4 Jan 2013 14.3 +0.7 8.2 10 Dec 2012 100.2 151.0 low 66%
Scoresby Research Institute 27.8 +2.3 40.1 17 Jan 2013 13.5 +0.5 7.1 10 Dec 2012 134.2 183.8 low 73%
Viewbank 28.4 +1.7 41.0 17 Jan 2013 14.1 +0.3 8.3 22 Dec 2012 111.8 163.3 low 68%

Notes

A Seasonal 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 3 am on Friday 1 March 2013. 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.

The ACORN-SAT dataset is being used for temperature area averages from December 2012 onwards. The major change from earlier datasets is that the ACORN-SAT dataset commences in 1910, rather than 1950, and hence rankings are calculated using a larger set of years.


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