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.
Dashed red/blue lines are a curve fit to the Climate since 1939.
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 1C higher in summer months and 0.5C higher in winter months, and the wiggly minimum curves should be about 0.5C lower.