Melbourne Metropolitan Area in July 2011: Warm in the city

  • Night-times warmer than usual
  • Daytime temperatures mixed
  • Rainfall close to average

Rainfall

Rainfall totals varied across the metropolitan area. In the west, Laverton RAAF recorded 14 rain days whilst Cranbourne Botanic Garden in the east observed 24 rain days. Laverton RAAF recorded just 59% of their long-term average whilst Coldstream recorded 127% of theirs. The wettest station overall was Ferny Creek (Dunns Hill) with 102.4 mm and the driest was Melbourne Airport with 22.4 mm. The wettest single day was the 7th when Ferny Creek (Dunns Hill) recorded 21.4 mm.

Temperature

The warmest station on average was Melbourne Regional Office with 11.2 C whilst the coolest on average was Ferny Creek (Dunns Hill) with 6.3 C. No stations broke maximum or minimum temperature records this month. However, Melbourne Regional Office, recorded monthly maximum and minimum temperatures that were both very much above average.

Maximum temperature

Average daytime temperatures around Melbourne were mixed. Most stations recorded average maximum temperatures that were close to normal for this time of year and within 1 C of their long-term averages. The hottest day was the 31st when Avalon Airport recorded 20.4 C. The warmest days on average, 14.6 C, were recorded at Melbourne Regional Office. The coolest days on average, 8.2 C, were recorded at Ferny Creek (Dunns Hill). The coldest day was the 7th when Ferny Creek (Dunns Hill) recorded 4.6 C.

Minimum temperature

Average night-time temperatures were warmer than usual during July. Monthly minimum temperatures were very much warmer than average at a couple of stations but most stations recorded averages that were within 1 C of normal. Ferny Creek was the only station to report a negative anomaly. The coldest night was the 16th when Avalon Airport recorded -2.1 C. Melbourne Regional Office recorded its coldest night since 2007 on the 27th with 2.7C. The coolest nights on average, 4.4 C, were recorded Ferny Creek (Dunns Hill). The warmest nights on average, 7.7 C, were recorded at Melbourne Regional Office. The warmest night was the 3rd when Moorabbin Airport recorded 11.2 C.

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Extremes in July 2011
Hottest day 20.4 C at Avalon Airport on the 31st
Warmest days on average 14.6 C at Melbourne Regional Office
Coolest days on average 8.2 C at Ferny Creek (Dunns Hill)
Coldest day 4.6 C at Ferny Creek (Dunns Hill) on the 7th
Coldest night -2.1 C at Avalon Airport on the 16th
Coolest nights on average 4.4 C at Ferny Creek (Dunns Hill)
Warmest nights on average 7.7 C at Melbourne Regional Office
Warmest night 11.2 C at Moorabbin Airport on the 3rd
Warmest on average overall 11.2 C at Melbourne Regional Office
Coolest on average overall 6.3 C at Ferny Creek (Dunns Hill)
Wettest overall 102.4 mm at Ferny Creek (Dunns Hill)
Driest overall 22.4 mm at Melbourne Airport
Wettest day 21.4 mm at Ferny Creek (Dunns Hill) on the 7th
Highest wind gust 96 km/h at Ferny Creek (Dunns Hill) on the 3rd

Summary statistics for July 2011
Maximum temperatures
for July
(C)
Minimum temperatures
for July
(C)
Rainfall
for July
(millimetres)
Mean for
July
2011
Diff
from
average
Highest for
July
2011
Mean for
July
2011
Diff
from
average
Lowest for
July
2011
Total for
July
2011
Average
for
July
Rank of
July
2011
Fraction of
July
average
East Central (district 86)
Bundoora (Latrobe University) 13.5 +0.2 17.0 29th 6.0 +0.6 -0.1 16th 40.6 48.6 average 84%
Cerberus 13.3 -0.3 18.4 31st 6.9 +0.7 -1.0 16th 62.4 73.5 average 85%
Coldstream 13.3 +0.1 17.5 31st 4.7 +1.1 -1.8 16th 76.8 60.3 high 127%
Cranbourne Botanic Gardens 12.8 -0.5 17.0 1st 6.2 +0.1 0.0 16th 66.3 68.5 average 97%
Essendon Airport 13.7 +0.8 17.8 31st 6.1 +0.9 -1.1 16th 27.6 43.5 low 63%
Ferny Creek (Dunns Hill) 8.2 -0.8 12.9 1st 4.4 -0.5 1.4 7th 102.4 85.1 average 120%
Melbourne Airport 13.5 +0.5 18.7 31st 5.6 +0.3 0.1 16th 22.4 35.5 low 63%
Melbourne Regional Office 14.6 +1.2 19.4 31st 7.7 +1.7 2.7 27th 37.2 47.5 average 78%
Moorabbin Airport 13.8 +0.2 18.5 31st 6.7 +0.6 -0.9 16th 51.2 61.8 average 83%
Scoresby Research Institute 13.5 +0.6 18.3 31st 6.4 +0.7 -0.6 16th 56.6 73.6 low 77%
Viewbank (ARPANSA) 13.8 -0.1 18.5 31st 6.3 +0.6 -0.2 16th 56.0 49.0 average 114%
West Central (district 87)
Avalon Airport 14.2 +0.2 20.4 31st 5.7 +0.7 -2.1 16th 25.0 37.3 low 67%
Laverton RAAF 13.9 +0.3 19.9 31st 6.1 +1.2 -1.8 16th 23.0 38.7 low 59%

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 11 am on Monday 1 August 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
Enquiries