Melbourne Metropolitan Area and Environs in Autumn 2013:

Rainfall less than that usually received.

In Melbourne, overnight minimum temperatures were much warmer than those usually experienced and averaged 12.9 °C (departure from normal 2.0 °C).

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 22.3 °C (departure from normal 2.0 °C), and the season began with an extended heatwave.

Total rainfall for the past autumn (Mar 2013 to May 2013) was 106 mm, this being less than that usually recorded (normal 163.3 mm, percentage of normal received 65%).

Records

Some sites had their highest Autumn mean daily maximum temperature on record.

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



Extremes in autumn 2013
Hottest day 39.0 °C at Avalon Airport on 12 Mar
Warmest days on average 22.3 °C at Avalon Airport
22.3 °C at Melbourne Regional Office
Coolest days on average 21.2 °C at Cerberus
Coldest day 12.1 °C at Coldstream on 22 May
Coldest night -2.3 °C at Coldstream on 6 May
Coolest nights on average 7.6 °C at Coldstream
Warmest nights on average 12.9 °C at Melbourne Regional Office
Warmest night 26.5 °C at Melbourne Regional Office on 13 Mar
Warmest on average overall 17.6 °C at Melbourne Regional Office
Coolest on average overall 14.7 °C at Coldstream
Wettest overall 153.9 mm at Cranbourne Botanic Gardens
Wettest day 30.8 mm at Essendon Airport on 17 Mar
Highest wind gust 96 km/h at Melbourne Airport on 21 Mar

Record highest autumn mean daily maximum temperature
Mean daily maximum
temperature
for autumn 2013 (°C)
Previous warmest
for autumn
Years of
record
Average for
autumn
Avalon Airport 22.3 22.2 in 2007 17 20.5



Record highest autumn daily minimum temperature
Highest daily minimum
temperature
in autumn 2013 (°C)
Previous warmest
for autumn
Years of
record
Average for
autumn
Melbourne Regional Office 26.5 on 13 Mar 26.3 on 3 Mar 1927 159 10.9
Scoresby Research Institute 26.1 on 13 Mar 25.2 on 18 Mar 2008 47 10.2
Essendon Airport 25.3 on 13 Mar 25.1 on 18 Mar 2008 45 9.9
Melbourne Airport 24.3 on 13 Mar = 24.3 on 18 Mar 2008 43 10.4
Bundoora (Latrobe University) 26.2 on 13 Mar 24.7 on 18 Mar 2008 31 10.0
Cranbourne Botanic Gardens 24.0 on 13 Mar 21.5 on 5 Apr 1992 24 10.3
Viewbank 25.2 on 13 Mar 22.7 on 15 Apr 2004 14 10.1



Summary statistics for autumn 2013
Maximum temperatures
for autumn
(°C)
Minimum temperatures
for autumn
(°C)
Rainfall
for autumn
(millimetres)
Mean for
autumn
2013
Diff
from
average
Highest for
autumn
2013
Mean for
autumn
2013
Diff
from
average
Lowest for
autumn
2013
Total for
autumn
2013
Average
for
autumn
Rank of
autumn
2013
Fraction of
autumn
average
Avalon Airport 22.3 +1.8 39.0 12 Mar 10.4 +0.6 1.7 29 May 39.2 97.6 v low 40%
Bundoora (Latrobe University) 21.4 +1.0 35.9 12 Mar 10.5 +0.5 2.0 23 May 107.3 151.5 low 71%
Cerberus 21.2 +1.6 37.1 12 Mar 10.5 +0.3 1.5 22 May 142.8 180.1 low 79%
Coldstream 21.9 +1.3 36.2 11 Mar 7.6 +0.4 -2.3 6 May 117.2 173.7 v low 67%
Cranbourne Botanic Gardens 21.3 +1.5 36.8 12 Mar 11.0 +0.7 3.0 24 May 153.9 180.1 average 85%
Essendon Airport 21.9 +1.9 37.3 11 Mar 11.3 +1.4 2.2 28 May 109.2 143.5 average 76%
Laverton RAAF 21.8 +1.6 37.2 12 Mar 11.0 +1.0 2.2 6 May 72.4 127.1 low 57%
Melbourne Airport 21.7 +1.4 36.9 11 Mar 11.0 +0.6 2.1 6 May 94.0 121.1 average 78%
Melbourne Regional Office 22.3 +2.0 37.1 11 Mar 12.9 +2.0 4.9 24 May 106.0 163.3 low 65%
Moorabbin Airport 21.6 +1.4 37.1 12 Mar 11.0 +0.4 1.7 6 May 114.0 177.3 low 64%
Scoresby Research Institute 21.5 +1.4 36.0 11 Mar 10.6 +0.4 1.4 6 May 135.4 212.2 low 64%
Viewbank 21.9 +0.8 37.2 11 Mar 10.6 +0.5 0.9 23 May 108.8 153.6 v low 71%

Notes

A Seasonal Climate Summary is prepared to list the main features of the weather in Melbourne 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 1 pm on Monday 3 June 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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