I think you're being optimistic just blocking Jan-April. I have written off the whole period from about October to late May. Recent years have been getting progressively worse.
If it isn't cloud, it's wind or extreme heat - so much so that atmospheric turbulence - even on a clear night, really makes the effort of opening the observatory a waste of time.
I have become reconciled to having a short astro season from late May to September. Beyond that, it's been a waste of time.
Peter
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