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Joe it can be excellent in winter where I observe, from either of two ovals in St Ives or Killara where basically there's a lot of bush nearby and not much housing, so no thermals off nearby houses.
The seeing in suburbia is often ruined by thermals rising through the light path of the object you're hoping to observe - from hot buildings, roads and concrete heated up during the day and from my experience this is much worse in summer than winter. This stuff frequently takes all night to cool down so you've basically got no chance.
The rare exception when seeing can be really good is a cloudy day blocking the sun - or even better a good thunderstorm to cool things down, followed by a clearing sky before sunset.
In winter people may be using heaters...
All of which is assumes the jet stream isn't stuffing things up anyway.
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