Monday, 2 August 2010 - Monthly Climate Summary for Melbourne Metropolitan Area and Environs - Product code IDCKGC1xx0
Melbourne Metropolitan Area and Environs in July 2010: Dry and warm conditions
- Below average rainfall
- Warmer than average daytime temperatures
Following a slightly wetter than normal June, rainfall for the central district was again below average in July. The lowest total rainfall in the Melbourne region occurred at Avalon Airport, which received only 17.2mm this month, compared to the long-term average of 37.7mm for July. Moorabin Airport was also particularly dry, measuring only 25.2mm, which is approximately 40% of that usually received.
The wettest location overall was Ferny Creek (Dunns Hill), which recorded 64.4mm for the month. The wettest single day, with a modest 16.8mm at Cranbourne Botanic Gardens, was the 15th of July. Melbourne also received reasonable showers on the 15th, recording 5.2mm, however the highest daily total registered at this site in July occurred on the 19th with 8.8mm. After experiencing only moderate rainfall events at the Melbourne Regional Office, which occurred on just 7 days in July 2010 (compared with the long-term average of 16 days), it is not surprising that this month was notably drier than average.
Daytime temperatures were warmer than normal across the central district. The Melbourne Regional Office was the warmest of these, achieving the highest average maximum temperature for this month of 14.6°C. Most stations in the central region recorded average daily maxima of between 13.3°C and 13.8°C, with three locations (Avalon Airport, Laverton RAAF and Melbourne Regional Office) warmer than 14°C on average. In contrast, the coolest daytime temperatures on average were 8.9°C at Ferny Creek (Dunns Hill) and the coldest day, reaching just 6.0°C was also observed at this site on the 14th.
In line with observations across much of the State, the 30th recorded the warmest day for the month in the central district, with 18.6°C at Avalon Airport and 18.0°C at Laverton RAAF.
Minimum temperatures across the central district were very close to normal in July. Most of the central region observed overnight temperatures near zero on the coldest nights (6th, 9th, 20th and 27th), but the coldest night recorded was -3.2°C at Coldstream on the 9th. Coldstream also experienced the coolest nights on average for the month with just 3.5°C.
Not surprisingly, the warmest nights on average were recorded at the Melbourne Regional Office (7.3°C) and the warmest nights of the month were also recorded at this site remaining at 12.0°C overnight on both the 30th and the 31st.
|Extremes in July 2010|
|Hottest day||18.6 °C at Avalon Airport on the 30th|
|Warmest days on average||14.6 °C at Melbourne Regional Office|
|Coolest days on average||8.9 °C at Ferny Creek (Dunns Hill)|
|Coldest day||6.0 °C at Ferny Creek (Dunns Hill) on the 14th|
|Coldest night||-3.2 °C at Coldstream on the 9th|
|Coolest nights on average||3.5 °C at Coldstream|
|Warmest nights on average||7.3 °C at Melbourne Regional Office|
12.0 °C at Melbourne Regional Office on the 30th|
12.0 °C at Melbourne Regional Office on the 31st
|Wettest overall||64.4 mm at Ferny Creek (Dunns Hill)|
|Driest overall||17.2 mm at Avalon Airport|
|Wettest day||16.8 mm at Cranbourne Botanic Gardens on the 15th|
|Highest wind gust||87 km/h at Ferny Creek (Dunns Hill) on the 10th|
|Summary statistics for July 2010|
|Bundoora (Latrobe University)||13.4||+0.1||16.5||31st||5.4||0.0||0.1||9th||34.3||48.9||average||70%|
|Cranbourne Botanic Gardens||13.4||+0.1||16.9||30th||5.9||-0.2||1.9||9th||45.3||68.6||low||66%|
|Ferny Creek (Dunns Hill)||8.9||-0.2||12.2||12th||5.0||+0.1||2.2||20th||64.4||84.1||average||77%|
|Melbourne Regional Office||14.6||+1.2||17.9||31st||7.3||+1.3||3.2||20th||29.6||47.6||low||62%|
|Moorabbin Airport||13.7||+0.1||17.2||30th||6.1||+0.1||0.7||9th||25.2||62.0||v low||41%|
|Scoresby Research Institute||13.3||+0.4||16.6||12th||5.3||-0.5||0.5||27th||42.8||73.9||low||58%|
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 Monday 2 August 2010. 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
(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.