Keen eyed readers warned me of this news – Warmest June temperatures for Perth
Working down this station list for the Perth region – In a few days the June 2015 archive will be visible. I have the page saved offline if anybody wants it emailed. Badgingarra had 20.6 last month but in 1985 saw 20.9.
Garden Island had 19.9 equal with 2006. Gingin Aero has 20.9 but saw 22.9 in 1996 and 21 in 2000. Karnet had 17.8 but saw 18.1 in 2006. Rottnest Island at 19.7 was equal to 1997.
Looking around at other stations some closed – Guildford Post Office saw 21.3 in 1944. Upper Swan Research saw 21.6 in 1983. Rottnest Lighthouse read 20.2 in 1949.
I ask if you could take out a century of urban heat island UHI growth – would the BoM claim stand up? I think on balance no doubt last month was very warm in Perth but the claim of “warmest ever” is not the most robust of claims to trumpet from the centre of a huge urban area.
Maybe the BoM use the those ‘shading’ techniques that produce the ‘correct temperature’ regardless of the individual sites.
I just revisited the NSW summary for Oct 2014, and, lo and behold, the BoM has adjusted the map.
Here’s the original map as per your blog in Nov 2014.
www.warwickhughes.com/blog/?p=3384
Here’s the new map as it appears today (scroll down to max anomaly map). Note the extra warmed areas in the NW and W of the state and a ‘hotspot’ around Hay which was missing before.
www.bom.gov.au/climate/current/month/nsw/archive/201410.summary.shtml
I’m going to see if I can find the original temps somewhere on my computer and match them up.
BoM made a prediction for the south-east Australian winter, it would be warmer and drier, whereas I thought it might be cooler and wetter.
A month later Hannam (SMH) said June was warmer and drier, but he only cited Sydney and Melbourne . Sounds dodgy.
You can check the rain plus max and min temperature Outlooks for June
www.bom.gov.au/jsp/sco/archive/index.jsp?map=tmax&outlook=median&area=national&period=month1&year=2015&month=5&day=28
check against the actual anomaly maps for June –
www.bom.gov.au/jsp/awap/temp/index.jsp?colour=colour&time=latest&step=0&map=maxanom&period=month&area=nat
Rainfall and max temperature were poor predictions but the minimum temperature Outlook was better.