BoM inspired media reports have widely spread the news that July 2013 in Melbourne was the warmest on record – most seem to be quoting daytime or maximum temperatures. here are a few articles –
Sydney Morning Herald –
Herald Sun –
ABC Online news –
I recall seeing an article that did mention the ever expanding Melbourne “urban heat island” (UHI). I quick check of July mean max for the following outer Melbourne weather stations indicates that outside the centre of Melbourne July in 1975 was warmer than July 2013. The record July 2013 warmth seems confined to the Melbourne UHI. Checking BoM data histories here and getting July 2013 data from here, select your station then follow the “Recents Months at…” links
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Melbourne Airport BoM# 86282 – July 2013 14.7 – July 1975 15.1
Frankston BoM# 86079 – July 2013 14.2 – July 1975 14.8
Other Victorian stations to have July 1975 – or July from several other years, warmer than July 2013 are, Echuca Airport BoM# 80015, Rutherglen Research Station BoM# 82039, East Sale Airport BoM# 85072, Ouyen Post Office BoM# 76047, Omeo BoM# 83025.
Surely any balanced media release from the BoM should have recognized the restricted and man-driven nature of their Melbourne claim.
That’s why they don’t issue balanced media releases!
Most people still don’t understand how central the inclusion of the urban heat island (UHI) effect is to the whole global warming tale. First it gives rise to these endless stories of “hottest ever” conditions. But they’re just for the average Joe who can be fooled into thinking that local heat “proves” global warming. More seriously, the UHI also biases the most advanced research into the sensitivity of climate to CO2. Recently, IPCC principals admitted that doubling CO2 would only cause 2 degrees warming instead of 3. But their calculations were all based on the HADCRUT4 database, which includes plenty of UHI effects. The revised estimate is therefore still too high.
Steve McIntyre has previously highlighted how poor the location is.
climateaudit.org/2007/10/23/melbournes-historic-weather-station/
It is also across the road from a large park, Carlton Gardens, which judging by the green grass is irrigated. Any changes to irrigation will affect temperatures substantially.
Another example of warmist publicity with zero mention of the sprawling Perth UHI.
Hottest August night on record
I did not see this in other Perth media but will keep a lookout.
Perth records don’t mean much as the recording site has been moved several times. Most recently in 1992 (I think) from the CBD, opposite a large irrigated park, which would have kept down night time temperatures, to Mt Lawley.
Melbourne – Isn’t that where David Jones hangs out. “John McTernan” of AGW in Australia.