It would be interesting and analytically useful to have "an average temperature recorded on the GAS & ELECTRICITY usage reports so that at times of high or low usage (depending on heating & cooling devices installed).
This would provide some answers as to when Usage is high, low or even average relating to Heating, Air Conditioner, Clothes Dryer effects on the usage figures.
Perhaps, even rainfall figures, which may have an effect of Clothes Dryer usage versus using the "Hills Hoist" where savings are achieved.
Obviously the above readings would need to be "area localized" versus every suburb's actual reading.
This could help explain why high & low readings occur given the monthly charts of daily usage..