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Hi Matt, this one really depends on how often you go out to image regardless of the conditions. I generally have a go any night the sky is clear or looks likley to be. In the last year I had one extended period of good seeing 8/10 and better in the evening hours that lasted nearly a week, that immediately preceding CHristmas. Apart from a few week long breaks in cloud last Christmas it's been pretty dismal cloud-wise. The one and only one good steady piece of seeing 8/10 or better I've had this year (06) was one morning a few weeks back when I stubbornly refused to acknowledge the ubiquitous cloud and by some miracle it had cleared before I imaged.
Point I'm getting to is that good seeing is rare and is often missed unless you image a lot. Dennis's best image of Jupiter was taken from Brisbane on a morning that I got up but decided not to bother because the sky was 90% cloud.
cheers,
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