Monday, 1 November 2010 - Monthly Climate Summary for Melbourne Metropolitan Area and Environs - Product code IDCKGC1xx0
Melbourne Metropolitan Area, October 2010: Wettest since 1975
Rainfall totals for October in the Melbourne metropolitan area were generally very much above average. Overall, daytime and night-time temperatures were close to average.
Overall, rainfall across the Melbourne area was very much above average this month. In fact, October 2010 was the wettest October since 1975 for most stations. The month was characterised by the frequent passage of rain bearing frontal systems.
Early in the month, most of the Melbourne region recorded widespread rainfall associated with a series of frontal systems. Most stations received about 2 mm on the 5th, whilst on the 7th, rainfall totals ranged from 6 mm at Bundoora up to 31 mm at Moorabbin Airport. Isolated showers were reported at some stations over the following days but it wasn't until the 13th that most stations recorded rainfall again. Most stations in the Melbourne area recorded five days of consecutive rainfall from the 13th to the 17th; 5-day totals ranged from 19.4 mm at Cranbourne Botanic Gardens up to 65.4 mm at Viewbank. On the 23rd, extensive rainfall delivered between 2 mm and 20 mm to stations in the Melbourne area. Notably, the largest falls for October were associated with a front/trough combination on the last weekend of the month bringing 41 mm to 76 mm to stations around Melbourne on the 31st.
The wettest station overall was Ferny Creek (Dunns Hill) with a total of 180.4 mm for the month. Ferny Creek (Dunns Hill) also recorded the single wettest day with 75.6 mm on the 31st. The driest station overall was Avalon Airport with 101.0 mm, even though it still received very much above average rainfall. Some sites had their highest total October rainfall for at least 20 years and some sites had their highest October daily rainfall on record.
Average maximum temperatures across the Melbourne area were close to normal for October. Only one station recorded an anomaly of more than 1 °C (+1.2 °C at Melbourne Regional Office), whilst just one station recorded a negative anomaly (-0.1 °C at Avalon Airport). All stations recorded their hottest daily maximum temperatures for the month on either the 22nd or 29th, both of which had several rain free days leading up to them which were associated with high pressure systems. All stations, except for Ferny Creek, recorded their coolest maximum temperatures for the month on the 15th after the passage of a cold front.
The hottest single day was the 29th at Avalon Airport with 29.3 °C, whereas the warmest days on average, 20.7 °C, were recorded at Melbourne Regional Office. Ferny Creek (Dunns Hill) recorded the coolest days on average, 15.5 °C, as well as the coldest single day, 9.1 °C on the 16th.
Average minimum temperatures across the Melbourne area were close to normal for October. Only one station recorded an anomaly of more than 1 °C (+1.4 °C at Melbourne Regional Office). Almost all stations in the Melbourne area recorded their coldest daily minimum temperatures on the 2nd after an almost cloud free night. Avalon Airport recorded the coldest night on the 2nd with just 0.3 °C. Coldstream recorded the coolest nights on average at 6.9 °C.
Almost every station in the Melbourne area recorded their warmest daily minimum temperature on the 30th after a night of almost complete cloud cover. Melbourne Regional Office recorded both the warmest nights on average, 10.9 °C, and the single warmest night, 18.8 °C on the 30th.
The strongest wind gust was 83 km/h at Essendon Airport on the 6th.
|Extremes in October 2010|
|Hottest day||29.3 °C at Avalon Airport on the 29th|
|Warmest days on average||20.7 °C at Melbourne Regional Office|
|Coolest days on average||15.5 °C at Ferny Creek (Dunns Hill)|
|Coldest day||9.1 °C at Ferny Creek (Dunns Hill) on the 16th|
|Coldest night||0.3 °C at Avalon Airport on the 2nd|
|Coolest nights on average||6.9 °C at Coldstream|
|Warmest nights on average||10.9 °C at Melbourne Regional Office|
|Warmest night||18.8 °C at Melbourne Regional Office on the 30th|
|Wettest overall||180.4 mm at Ferny Creek (Dunns Hill)|
|Driest overall||101.0 mm at Avalon Airport|
|Wettest day||75.6 mm at Ferny Creek (Dunns Hill) on the 31st|
|Highest wind gust||83 km/h at Essendon Airport on the 6th|
|Record highest October daily rainfall|
|Highest in October 2010 (mm)||Previous highest (mm)||Years of record|
|Scoresby Research Institute||63.6||on the 31st||63.2||on the 21st in 1953||61|
|Moorabbin Airport||72.0||on the 31st||52.6||on the 16th in 1983||59|
|Cerberus||61.0||on the 31st||40.0||on the 24th in 2000||21|
|Cranbourne Botanic Gardens||53.8||on the 31st||46.0||on the 23rd in 1995||21|
|Highest total October rainfall for at least 20 years|
|Total for October 2010 (mm)||Most recent October this high or higher||Years since higher||Average for October|
|Laverton RAAF||115.8||165.4||in 1975||35||57.4|
|Melbourne Airport||128.8||143.8||in 1975||35||54.9|
|Melbourne Regional Office||135.2||150.2||in 1975||35||66.3|
|Moorabbin Airport||163.6||165.4||in 1975||33||71.0|
|Bundoora (Latrobe University)||122.4||123.9||in 1983||27||65.2|
|Avalon Airport||101.0||144.0||in 1975||25||49.8|
|Summary statistics for October 2010|
|Maximum temperatures (°C)||Minimum temperatures (°C)||Rainfall (mm)|
|Avalon Airport||19.5||-0.3||29.3||29th||7.6||-0.2||0.3||2nd||101.0||49.8||v high||203%|
|Bundoora (Latrobe University)||19.9||+0.4||27.2||22nd||9.0||+0.4||2.5||2nd||122.4||65.2||v high||188%|
|Essendon Airport||19.6||+0.5||27.4||22nd||8.8||+0.7||2.3||2nd||128.2||61.2||v high||209%|
|Ferny Creek (Dunns Hill)||15.5||+0.3||23.6||22nd||7.3||+0.1||0.5||16th||180.4||94.7||high||190%|
|Laverton RAAF||19.4||+0.2||29.1||22nd||8.4||+0.2||1.4||2nd||115.8||57.4||v high||202%|
|Melbourne Airport||19.4||+0.2||27.2||22nd||8.4||0.0||2.6||2nd||128.8||54.9||v high||235%|
|Melbourne Regional Office||20.7||+1.1||28.9||22nd||10.9||+1.4||4.7||16th||135.2||66.3||v high||204%|
|Moorabbin Airport||19.3||+0.2||28.7||29th||9.2||0.0||3.2||2nd||163.6||71.0||v high||230%|
|Scoresby Research Institute||19.7||+0.8||27.1||22nd||8.4||-0.4||2.4||2nd||147.6||85.9||high||172%|
|Viewbank (ARPANSA)||20.2||+0.2||27.3||29th||8.8||+0.1||2.7||2nd||148.6||66.9||v high||222%|
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 10 am on Monday 1 November 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.