Melbourne Area in July 2013 - Hottest July on Record

July 2013 in the Melbourne area was characterised by:

  • The hottest July daytime temperatures recorded at almost all stations
  • The hottest July night-time temperatures recorded at half of all stations
  • Close to normal rainfall for most suburbs.

Rainfall

Preliminary data indicates that rainfall totals for July 2013 were above average in Melbourne's west and the CBD. Elsewhere they were close to normal. The wettest station overall was Cranbourne Botanic Gardens with 69.4 mm whilst the driest was Melbourne Airport with 36.4 mm. The wettest single day was the 14th when Avalon Airport recoded 19.2 mm.

Temperature

The warmest station on average (combination of maximum and minimum temperatures) was Melbourne Regional Office with 12.1 C while the coolest was Coldstream with 9.8 C.

Maximum temperature

Average daytime temperatures were the hottest on record for July at almost all stations around Melbourne (highest July mean daily maximum temperature on record). The hottest day was the 18th when Melbourne Regional Office observed a new highest July temperature on record with 23.3 C. Melbourne Regional Office also recorded the warmest days on average with 15.9 C. Average daytime temperatures were 1-2 C warmer than usual for July at most stations. The coolest days on average were recorded at Melbourne Airport with 14.7 C. The coldest day was the 20th when both Laverton RAAF and Melbourne Airport recorded 8.4 C.

Minimum temperature

Half of all stations in the Melbourne area had their highest July mean daily minimum temperature on record in 2013. Those that didn't record their hottest average June night-times still observed night-time temperatures above average to very much above average for this time of year. Average night-time temperatures were 1-2 C warmer than usual for July at most stations. The coldest night was the 10th when Coldstream recorded -4.2 C and Coldstream also recorded the coolest nights on average with 4.5 C. The warmest night was the 19th when Melbourne Regional Office recorded 14.3 C (its warmest July night (highest daily minimum temperature) on record) and Melbourne Regional Office also recorded the warmest nights on average with 8.4 C.

Wind

The strongest wind gust was 87 km/h recorded at Essendon Airport on the 18th.

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Extremes in July 2013
Hottest day 23.3 C at Melbourne Regional Office on the 18th
Warmest days on average 15.9 C at Melbourne Regional Office
Coolest days on average 14.7 C at Melbourne Airport
Coldest day 8.4 C at Laverton RAAF on the 20th
8.4 C at Melbourne Airport on the 20th
Coldest night -4.2 C at Coldstream on the 10th
Coolest nights on average 4.5 C at Coldstream
Warmest nights on average 8.4 C at Melbourne Regional Office
Warmest night 14.3 C at Melbourne Regional Office on the 19th
Warmest on average overall 12.1 C at Melbourne Regional Office
Coolest on average overall 9.8 C at Coldstream
Wettest overall 69.4 mm at Cranbourne Botanic Gardens
Driest overall 36.4 mm at Melbourne Airport
Wettest day 19.2 mm at Avalon Airport on the 14th
Highest wind gust 87 km/h at Essendon Airport on the 18th

Record highest July temperature
Highest temperature
in July 2013 (C)
Previous warmest
for July
Years of
record
Average for
July
Melbourne Regional Office 23.3 on the 18th 23.1 on the 30th in 1975 159 13.5
Scoresby Research Institute 22.2 on the 18th 21.6 on the 28th in 1975 47 13.0
Essendon Airport 21.9 on the 18th 18.9 on the 20th in 1950 44 13.0
Moorabbin Airport 23.1 on the 18th 22.5 on the 30th in 1975 41 13.6
Bundoora (Latrobe University) 23.1 on the 18th 20.3 on the 7th in 1994 31 13.3
Cranbourne Botanic Gardens 22.5 on the 18th 20.1 on the 6th in 1994 24 13.3
Cerberus 21.9 on the 18th 19.6 on the 7th in 1994 22 13.6



Record highest July mean daily maximum temperature
Mean daily maximum
temperature
for July 2013 (C)
Previous warmest
for July
Years of
record
Average for
July
Melbourne Regional Office 15.9 15.7 in 1975 158 13.5
Scoresby Research Institute 15.0 14.5 in 1994 55 13.0
Essendon Airport 14.9 14.4 in 2005 43 13.0
Moorabbin Airport 15.6 15.2 in 1975 40 13.6
Bundoora (Latrobe University) 15.2 14.6 in 2002 30 13.3
Cranbourne Botanic Gardens 14.8 14.5 in 1999 23 13.3
Cerberus 14.8 14.6 in 1994 21 13.6



Record highest July daily minimum temperature
Highest daily minimum
temperature
in July 2013 (C)
Previous warmest
for July
Years of
record
Average for
July
Melbourne Regional Office 14.3 on the 19th = 14.3 on the 1st in 1903 159 6.0
Laverton RAAF 13.6 on the 19th 13.4 on the 28th in 1975 70 5.0
Scoresby Research Institute 14.0 on the 19th 12.9 on the 28th in 2002 47 5.8
Essendon Airport 13.2 on the 19th 11.8 on the 1st in 1966 44 5.2
Melbourne Airport 12.7 on the 19th = 12.7 on the 28th in 1975 44 5.4
Bundoora (Latrobe University) 12.9 on the 19th 12.5 on the 21st in 2009 31 5.5
Cranbourne Botanic Gardens 13.5 on the 19th 12.4 on the 26th in 2007 24 6.1
Cerberus 13.9 on the 19th 12.1 on the 21st in 2009 22 6.2



Record highest July mean daily minimum temperature
Mean daily minimum
temperature
for July 2013 (C)
Previous warmest
for July
Years of
record
Average for
July
Melbourne Regional Office 8.4 = 8.4 in 2005 158 6.0
Essendon Airport 7.2 6.7 in 2005 43 5.2
Melbourne Airport 7.0 6.7 in 1975 43 5.4
Cerberus 7.1 = 7.1 in 2005 21 6.2


Summary statistics for July 2013
Maximum temperatures
for July
(C)
Minimum temperatures
for July
(C)
Rainfall
for July
(millimetres)
Mean for
July
2013
Diff
from
average
Highest for
July
2013
Mean for
July
2013
Diff
from
average
Lowest for
July
2013
Total for
July
2013
Average
for
July
Rank of
July
2013
Fraction of
July
average
East Central (district 86)
Bundoora (Latrobe University) 15.2 +1.9 23.1 18th 6.7 +1.2 -1.0 10th 56.5 49.6 average 114%
Cerberus 14.8 +1.2 21.9 18th 7.1 +0.9 -0.9 10th 56.8 72.7 low 78%
Coldstream 15.2 +2.0 22.5 18th 4.5 +0.8 -4.2 10th 55.6 62.2 average 89%
Cranbourne Botanic Gardens 14.8 +1.5 22.5 18th 7.3 +1.2 1.0 10th 69.4 68.5 average 101%
Essendon Airport 14.9 +1.9 21.9 18th 7.2 +2.0 -0.8 10th 50.6 43.6 average 116%
Melbourne Airport 14.7 +1.6 21.3 18th 7.0 +1.6 1.7 10th 36.4 35.5 average 103%
Melbourne Regional Office 15.9 +2.4 23.3 18th 8.4 +2.4 3.1 9th 60.8 47.7 high 127%
Moorabbin Airport 15.6 +2.0 23.1 18th 7.2 +1.1 -1.7 10th 62.0 61.8 average 100%
Scoresby Research Institute 15.0 +2.0 22.2 18th 7.1 +1.3 0.2 31st 64.6 73.6 average 88%
Viewbank 15.1 +1.2 22.1 18th 6.6 +0.8 0.1 31st 49.8 50.5 average 99%
West Central (district 87)
Avalon Airport 15.7 +1.7 22.5 18th 6.1 +1.1 -1.5 10th 53.4 38.1 high 140%
Laverton RAAF 15.3 +1.6 21.4 18th 6.8 +1.8 -0.1 10th 47.6 38.7 high 123%

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 1 pm on Thursday 1 August 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.

Further information

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