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Looks very grainy. Do you have exif info ? Looks like 6400 or more asa. A hot night cannot be the main problem I have taken many pictures in Bali at 27ºC with iso1600 and virtually no grain. But the exposure time was always short, no more than a few minutes. I don't have experience with *hours* of exposure time that might be the problem. Did you set the 'long exposure noise reduction' on ? In that case the camera will take another picture (darkframe) with the same (which means hours in your case) exposure time.
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