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At my dark site in NSW I find winter usually has better seeing than summer as a general rule.
If its windy I often find the seeing is worse/poor.
After a storm sometimes the seeing can be good. Its like all the energy is swept out of the atmosphere for a while.
Peter Ward has mentioned if there is fog and it clears seeing will be good.
I am not sure if there is a general rule about altitude but I imagine higher is usually better than lower especially if you are upwind of any mountains etc. You generally want even, flat terrain upwind of your location.
Less atmosphere to image through is better than more!
Islands that are fairly flat or islands with a mountain and the top of the mountain seem to be a good formula. Damien Peach likes Barbados and Barbados is quite a flat island compared to most others in the Carribean. You get smooth air flow over many kilometres of sea so it is flowing very smoothly.
I often wondered if coastal areas would be better if the winds were blowing from the ocean to the inland. I haven't heard anyone comment on this. Anyone know? Or is the surf haze and extra cloud in these areas more the problem?
Greg.
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