Melbourne Metropolitan Area in April 2011: More rain than usual

  • Rainfall above average
  • Temperatures cooler than usual but close to average

Rainfall

Rainfall in April around Melbourne was average to above average. The wettest station overall was Viewbank (ARPANSA) with 119.6 mm which is more than double its long-term average of 58.3 mm. Viewbank also recorded the wettest day of the month on the 12th with 67.2 mm, all other stations except Cranbourne Botanic Gardens recorded their wettest day of the month on the 12th. The driest station overall was Avalon Airport with 41.4 mm but even that was wetter than their long-term average of 37.0 mm. Melbourne Airport recorded 10 rain days for the month whilst to the southeast, Cranbourne Botanic Gardens doubled that with 20. Some sites had their highest total April rainfall for at least 10 years while others had their highest April daily rainfall on record.

Maximum temperature

Maximum temperatures around Melbourne were mixed but generally close to average. All station reported average maximum temperatures within 1 C of their long-term mean. The coolest days on average, 15.9 C, were at Ferny Creek (Dunns Hill) whilst the warmest, 21.2 C, were recorded at Melbourne Regional Office. The warmest day was the 9th when Essendon Airport recorded 27.7 C, a majority of other stations also recorded their warmest day of the month on the 9th. The coolest day was the 13th when Ferny Creek (Dunns Hill) recorded 9.7 C. No stations broke any daily or monthly maximum temperature records this month

Minimum temperature

Minimum temperatures for most stations around Melbourne were close to average. The coolest nights on average were 7.2 C at Coldstream, whilst Melbourne Regional Office recorded the warmest at 11.7 C. The coldest night was the 11th when Melbourne Airport recorded 3.2 C, most other stations also recorded their coldest night for the month on the 11th. The warmest night for the month was the 9th when Laverton RAAF recorded 17.3 C. No stations broke any daily or monthly minimum temperature records this month.

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Extremes in April 2011
Hottest day 27.7 C at Essendon Airport on the 9th
Warmest days on average 21.2 C at Melbourne Regional Office
Coolest days on average 15.9 C at Ferny Creek (Dunns Hill)
Coldest day 9.7 C at Ferny Creek (Dunns Hill) on the 13th
Coldest night 3.2 C at Melbourne Airport on the 11th
Coolest nights on average 7.2 C at Coldstream
Warmest nights on average 11.7 C at Melbourne Regional Office
Warmest night 17.3 C at Laverton RAAF on the 9th
Warmest on average overall 16.5 C at Melbourne Regional Office
Coolest on average overall 12.7 C at Ferny Creek (Dunns Hill)
Wettest overall 119.6 mm at Viewbank (ARPANSA)
Wettest day 67.2 mm at Viewbank (ARPANSA) on the 12th
Highest wind gust 72 km/h at Ferny Creek (Dunns Hill) on the 9th

Record highest April daily rainfall
Highest daily rainfall
in April 2011 (mm)
Previous wettest
for April
Years of
record
Viewbank (ARPANSA) 67.2 on the 12th 53.0 on the 24th in 2001 12



Highest total April rainfall for at least 10 years
Total rainfall
for April 2011 (mm)
Most recent April
at least this wet
Years since
wetter
Average for
April
Scoresby Research Institute 92.4 102.8 in 1989 19 66.8
Essendon Airport 65.0 66.0 in 1978 17 55.0
Bundoora (Latrobe University) 86.8 121.4 in 2001 10 54.4
Coldstream 87.2 102.6 in 2001 10 61.3
Ferny Creek (Dunns Hill) 116.4 215.4 in 2001 10 94.7
Laverton RAAF 52.6 105.6 in 2001 10 45.7
Melbourne Regional Office 101.8 125.6 in 2001 10 57.4
Viewbank (ARPANSA) 119.6 131.6 in 2001 10 58.3



Summary statistics for April 2011
Maximum temperatures
for April
(C)
Minimum temperatures
for April
(C)
Rainfall
for April
(millimetres)
Mean for
April
2011
Diff
from
average
Highest for
April
2011
Mean for
April
2011
Diff
from
average
Lowest for
April
2011
Total for
April
2011
Average
for
April
Rank of
April
2011
Fraction of
April
average
East Central (district 86)
Bundoora (Latrobe University) 20.2 -0.3 27.0 9th 9.4 -0.4 5.0 1st 86.8 54.4 high 160%
Cerberus 19.5 -0.2 26.9 9th 9.9 0.0 4.4 11th 83.8 66.5 high 126%
Coldstream 20.1 -0.2 25.3 9th 7.2 +0.6 3.6 11th 87.2 61.3 high 142%
Cranbourne Botanic Gardens 19.4 -0.4 25.5 8th 9.8 -0.4 4.3 11th 100.5 70.7 high 142%
Essendon Airport 20.3 +0.3 27.7 9th 9.6 -0.2 4.6 11th 65.0 55.0 average 118%
Ferny Creek (Dunns Hill) 15.9 -0.1 22.0 7th 9.4 0.0 6.1 23rd 116.4 94.7 high 123%
Melbourne Airport 20.3 0.0 27.6 9th 9.3 -0.9 3.2 11th 43.0 43.8 average 98%
Melbourne Regional Office 21.2 +0.9 27.1 9th 11.7 +0.9 8.2 11th 101.8 57.4 high 177%
Moorabbin Airport 20.1 0.0 26.7 9th 9.8 -0.6 4.5 11th 84.2 63.0 high 134%
Scoresby Research Institute 19.8 -0.1 25.5 9th 9.4 -0.7 4.7 11th 92.4 66.8 high 138%
Viewbank (ARPANSA) 20.5 -0.9 26.9 9th 9.3 -0.7 5.0 11th 119.6 58.3 high 205%
West Central (district 87)
Avalon Airport 20.1 -0.1 27.3 9th 8.7 -0.8 4.4 11th 41.4 37.0 average 112%
Laverton RAAF 20.1 -0.1 26.9 9th 9.3 -0.5 3.5 11th 52.6 45.7 high 115%

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 pm on Monday 2 May 2011. 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.

Further information

Media
(03) 9669 4057
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