30 day means are calculated using daily min/max data from BoM. The green line shows the year so far. It lags by 15 days from todays date because of the 30 day averaging.
Red/blue dashed lines are a simple curve fit to the Climate since 1897.
Note that I wasn't saving min/max data prior to May 2009. The daily minimum and maximums before May 2009 are instead computed from hourly temperatures which are under-sampled compared to the BoM data and the real temperatures - so the wiggly maximum curves should be about 0.5C to 1C higher. The minimum curves are probably ok to within about 0.1 or 0.2C.