Melbourne Metropolitan Area and Environs in July 2012: Rainfall slightly more than that usually received.

Note: Averages are long-term means based on observations from all available years of record, which vary widely from site to site.

The 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 7.7C (departure from normal 1.7C). 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 14.9C (departure from normal 1.4C). Total rainfall for the month was 59.4 mm, this being slightly more than that usually recorded (normal 47.6 mm, percentage of normal received 125%).

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 slightly warmer than those usually experienced and averaged 6.1C (departure from normal 0.9C). Daytime maximum temperatures were slightly warmer than those usually experienced and averaged 13.8C (departure from normal 0.8C). Total rainfall for the month was 44.2 mm, this being close to that usually recorded (normal 43.5 mm, percentage of normal received 102%).

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 5.8C (departure from normal 0.8C). Daytime maximum temperatures were slightly warmer than those usually experienced and averaged 14.2C (departure from normal 0.6C). Total rainfall for the month was 30 mm, this being slightly less than that usually recorded (normal 38.6 mm, percentage of normal received 78%).

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 5.9C (departure from normal 0.4C). Daytime maximum temperatures were near to those usually experienced and averaged 13.7C (departure from normal 0.4C). Total rainfall for the month was 74.1 mm, this being much more than that usually recorded (normal 49.4 mm, percentage of normal received 150%).

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 6.4C (departure from normal 0.3C). Daytime maximum temperatures were slightly warmer than those usually experienced and averaged 14.2C (departure from normal 0.6C). Total rainfall for the month was 58.4 mm, this being close to that usually recorded (normal 61.8 mm, percentage of normal received 94%).

Notable events

Some sites had their highest total July rainfall for at least 10 years. Some sites had their lowest July temperature on record.

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Extremes in July 2012
Hottest day 17.8 C at Avalon Airport on the 16th
Warmest days on average 14.9 C at Melbourne Regional Office
Coolest days on average 13.6 C at Coldstream
13.6 C at Melbourne Airport
Coldest day 9.0 C at Coldstream on the 1st
Coldest night -3.8 C at Coldstream on the 8th
Coolest nights on average 4.4 C at Coldstream
Warmest nights on average 7.7 C at Melbourne Regional Office
Warmest night 11.7 C at Melbourne Regional Office on the 12th
11.7 C at Cerberus on the 17th
Warmest on average overall 11.3 C at Melbourne Regional Office
Coolest on average overall 9.0 C at Coldstream
Wettest overall 100.2 mm at Coldstream
Highest wind gust 65 km/h at Avalon Airport on the 15th
65 km/h at Melbourne Airport on the 17th
65 km/h at Moorabbin Airport on the 17th

Highest total July rainfall for at least 10 years
Total rainfall
for July 2012 (mm)
Most recent July
at least this wet
Years since
wetter
Average for
July
Bundoora (Latrobe University) 74.1 79.0 in 1996 16 49.4



Record lowest July temperature
Lowest temperature
in July 2012 (C)
Previous coolest
for July
Years of
record
Average for
July
Viewbank -1.2 on the 7th -1.0 on the 20th in 2006 13 5.8



Summary statistics for July 2012
Maximum temperatures
for July
(C)
Minimum temperatures
for July
(C)
Rainfall
for July
(millimetres)
Mean for
July
2012
Diff
from
average
Highest for
July
2012
Mean for
July
2012
Diff
from
average
Lowest for
July
2012
Total for
July
2012
Average
for
July
Rank of
July
2012
Fraction of
July
average
East Central (district 86)
Bundoora (Latrobe University) 13.7 +0.4 16.1 25th 5.9 +0.4 -1.2 7th 74.1 49.4 high 150%
Cerberus 13.8 +0.2 16.8 16th 6.4 +0.2 0.3 8th 72.2 73.4 average 98%
Coldstream 13.6 +0.4 16.6 9th 4.4 +0.7 -3.8 8th 100.2 62.6 high 160%
Cranbourne Botanic Gardens 13.7 +0.4 16.7 16th 6.3 +0.2 1.8 8th 63.4 68.5 average 93%
Essendon Airport 13.8 +0.8 16.4 16th 6.1 +0.9 0.0 7th 44.2 43.5 average 102%
Melbourne Airport 13.6 +0.6 16.5 16th 5.9 +0.5 -0.2 8th 34.6 35.4 average 98%
Melbourne Regional Office 14.9 +1.4 17.6 21st 7.7 +1.7 2.3 7th 59.4 47.6 high 125%
Moorabbin Airport 14.2 +0.6 17.6 9th 6.4 +0.3 -0.8 8th 58.4 61.8 average 94%
Scoresby Research Institute 13.8 +0.8 16.4 9th 6.2 +0.4 0.9 7th 81.8 73.8 average 111%
Viewbank 14.1 +0.2 16.7 25th 6.0 +0.2 -1.2 7th 69.0 50.5 high 137%
West Central (district 87)
Avalon Airport 14.3 +0.3 17.8 16th 5.6 +0.6 -2.1 8th 48.8 37.6 high 130%
Laverton RAAF 14.2 +0.6 17.4 16th 5.8 +0.8 -0.6 7th 30.0 38.6 average 78%

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 3 pm on Wednesday 1 August 2012. 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