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remery said.. 
Hey remsey
Not to be pedantic but just thinkin' critically, where does that data come from ? Because BOM doesn't seem to have a single set of data for a station in Albany on the time scale displayed there.
From what I can see it has one set at station 009500 from 1907 to 1965, and a set for a different station 009741 from 1965 to 2014 and also then station 09999 from 2012 to present.
Interesting the set up to 1965 is from a station at elevation 3m on the waterfront, and then after 1965 the set is from a station at the airport, about 12km in land.
And to me, without the benefit of the raw data, the graph seems to show a steady spread up to about 1965, then a discontinuous jump but another steady (or perhaps declining ?) spread after 1965.
You sure your graph isn't just showing days >30 deg at the ocean and at 12km inland have no particular trend within each, but do have a fairly consistent difference between the two ?
Also is the red trend line just a straight line from first data point to last ? Seems a bit non-sciency doesn't it. If you took the scale 1920 to 2018 (presumably no more or less logical than any other start / finish points) and did the same red line it would be a significant declining grade ?