Melbourne Metropolitan Area and Environs in June 2013: 

Wet start; 

Dry and frosty finish.

Highlights:

  • Melbourne experieced its wettest first fortnight of winter on record.
  • By contrast, Melbourne experienced its longest June 'run' of rainless days for more than 30 years (12 in a row between the 19th and the 30th) - there was a 13-day rainless spell in 1982 between the 3rd and the 15th.
  • Melbourne experienced its second longest June 'run' of minimum temperatures below 5 deg C (9 in a row between the 19th and 27th)*
  • Over southeastern Australia, June was unusual in that on every day between the 12th and the 26th, the prevailing synoptic type was one associated with flow from the east - initially, a rain bearing east coast low followed by a 'frosty' anticyclone (usually, westerly flow predominates during June)**.  

*The longest June 'run' of sub-5 deg C temperatures is 12 in a row in June 1972.

**Consistent with the overall strengthening and southward shift of the subtropical ridge that has been observed in recent decades - a feature that has also been predicted by global climate models.

Summary:

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 7.4C (departure from normal 0.5C). 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 warmer than those usually experienced and averaged 15.4C (departure from normal 1.4C). Total rainfall for the month far was 94.8 mm, this being much more than that usually recorded (normal 49.5 mm, percentage of normal received 192%).

Some 20 kilometres northwest of the Melbourne city centre, Melbourne Airport, is more typical of the suburbs. Here, overnight minimum temperatures were near to those usually experienced and averaged 5.8C (departure from normal -0.4C). Daytime maximum temperatures were slightly warmer than those usually experienced and averaged 14.1C (departure from normal 0.5C). Total rainfall for the month   was 128.2 mm, this being much more than that usually recorded (normal 39.9 mm, percentage of normal received 321%).

Some Temperature Records:

Some sites had their highest June mean daily maximum temperature for at least 5 years.

Some sites had their lowest June temperature on record.

Some sites had their warmest June night (highest daily minimum temperature) on record.

Some sites had their lowest June mean daily minimum temperature for at least 5 years.


Extremes in June 2013
Hottest day 18.4 C at Viewbank on the 30th
Warmest days on average 15.4 C at Melbourne Regional Office
Coolest days on average 13.9 C at Cranbourne Botanic Gardens
Coldest day 10.0 C at Cranbourne Botanic Gardens on the 17th
10.0 C at Coldstream on the 24th
10.0 C at Viewbank on the 24th
Coldest night -5.1 C at Coldstream on the 23rd
Coolest nights on average 2.6 C at Coldstream
Warmest nights on average 7.4 C at Melbourne Regional Office
Warmest night 13.7 C at Melbourne Regional Office on the 1st
Warmest on average overall 11.4 C at Melbourne Regional Office
Coolest on average overall 8.6 C at Coldstream
Wettest overall
Wettest day 87.4 mm at Viewbank on the 1st
Highest wind gust 65 km/h at Melbourne Airport on the 10th

Highest June mean daily maximum temperature for at least 5 years
Mean daily maximum
temperature
for June 2013 (C)
Most recent June
at least this warm
Years since
warmer
Average for
June
Cerberus 14.5 15.1 in 2008 5 14.1



Record highest June daily minimum temperature
Highest daily minimum
temperature
in June 2013 (C)
Previous warmest
for June
Years of
record
Average for
June
Essendon Airport 13.1 on the 1st 12.9 on the 9th in 2004 45 5.9



Record lowest June temperature
Lowest temperature
in June 2013 (C)
Previous coolest
for June
Years of
record
Average for
June
Viewbank -1.3 on the 23rd -1.2 on the 20th in 2006 14 6.3



Lowest June mean daily minimum temperature for at least 5 years
Mean daily minimum
temperature
for June 2013 (C)
Most recent June
at least this cool
Years since
cooler
Average for
June
Laverton RAAF 5.4 3.9 in 2006 7 5.8
Bundoora (Latrobe University) 5.5 5.2 in 2007 6 6.1
Coldstream 2.6 2.3 in 2007 6 4.1
Essendon Airport 5.8 5.6 in 2007 6 5.9
Melbourne Airport 5.8 5.4 in 2007 6 6.2
Melbourne Regional Office 7.4 7.2 in 2007 6 6.9
Scoresby Research Institute 5.2 4.4 in 2007 6 6.3
Viewbank 5.3 4.7 in 2007 6 6.3



Summary statistics for June 2013
Maximum temperatures
for June
(C)
Minimum temperatures
for June
(C)
Rainfall
for June
(millimetres)
Mean for
June
2013
Diff
from
average
Highest for
June
2013
Mean for
June
2013
Diff
from
average
Lowest for
June
2013
Total for
June
2013
Average
for
June
Rank of
June
2013
Fraction of
June
average
Bundoora (Latrobe University) 14.1 +0.2 17.5 27th 5.5 -0.6 -1.3 23rd 140.3 57.8 highest 243%
Cerberus 14.5 +0.4 16.9 6th 6.0 -0.8 -1.5 22nd 102.0 73.3 high 139%
Coldstream 14.5 +0.5 17.2 28th 2.6 -1.5 -5.1 23rd 64.4 66.0 average 98%
Coldstream Comparison 14.5   17.2 28th 2.5   -5.2 23rd 64.4
Cranbourne Botanic Gardens 13.9 0.0 16.8 6th 6.6 -0.1 -0.2 22nd 127.4 81.1 high 157%
Essendon Airport 14.4 +0.7 18.3 30th 5.8 -0.1 -0.6 22nd 115.0 40.2 highest 286%
Ferny Creek 10.7   14.2 27th 6.4   3.8 8th 186.4
Frankston AWS 14.0 +0.4 17.1 27th 8.2 -0.5 3.2 21st
Melbourne Airport 14.1 +0.5 17.7 30th 5.8 -0.4 0.2 24th 128.2 39.9 highest 321%
Melbourne Regional Office 15.4 +1.3 18.3 30th 7.4 +0.5 1.5 23rd 94.8 49.5 v high 192%
Moorabbin Airport 14.8 +0.6 18.0 27th 5.7 -1.0 -1.9 23rd 83.4 56.6 high 147%
Phillip Island Penguin Reserve 14.7 +0.3 16.2 27th 7.5 -0.1 -1.5 22nd 134.8 81.2 v high 166%
Rhyll 14.4 +0.6 16.1 2nd 9.1 +0.3 5.2 22nd 96.2 62.2 high 155%
Scoresby Research Institute 14.5 +1.0 17.5 30th 5.2 -1.1 -1.7 23rd 138.4 70.3 v high 197%
Viewbank 14.5 +0.1 18.4 30th 5.3 -1.0 -1.3 23rd 129.2 56.6 highest 228%
Wallan (Kilmore Gap) 10.6 +0.8 13.9 30th 5.5 +0.7 2.7 21st 90.4 66.7 high 136%
Wonthaggi 14.8 +0.6 17.1 26th 7.3 +0.7 1.6 22nd 124.0 96.5 high 128%
Avalon Airport 14.6 -0.1 18.1 27th 5.0 -0.8 -1.6 22nd 75.0 38.1 v high 197%
Breakwater (Geelong Racecourse) 14.9   17.5 28th 6.1   -0.2 22nd 84.6
Laverton RAAF 14.4 +0.2 17.8 30th 5.4 -0.4 -1.5 23rd 70.0 38.7 v high 181%
Sheoaks 13.1 +0.3 16.3 27th 4.1 -1.5 -1.5 23rd 91.2 41.2 v high 221%

 


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 am on Monday 1 July 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 5 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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