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 curve fit to the Climate since 1855.
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 average maximum curves should be about 1C higher in summer months and about 0.5C higher in winter months. The minimum curves are probably ok to within about 0.1 or 0.2C.