I have found that plants finished the last few weeks in very cool temperatures (50 to 60 degrees) seem to taste grapey and sweeter. I need to give this more thought and do some more research. Maybe it was just the strains I had going at the time but this occurred to multiple strains so I think that the cooler temperatures some how effected the taste. Also cooler finishing temperatures seem to give some plants and buds a nice bluish/purple hue...