Got the same problem here. If there's no clouds then there's heavy dew. The nice Summer dew free nights have gone. This morning I was going by 4am and it was pretty cold but not too bad, grass was wet from dew. Finderscope kept getting wet on the lens. Got some pretty good (for me) saturn/mars footage trying out a 3x barlow instead of 2x. Finished by 6am and when I left for work at 7am the car windscreen had ice all over it that the wipers couldn't shift and a fair bit of frost around.
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