It could very well be a temp change. thats what seems most likely.

but assuming that it isn't the temps fault, i wouldn't even know where to start as to what strain that is... im guessing it's some sort of indica because of the longer, skinny leaves poking out through the bud.

the best way to tell my friend, is simply to roll a fat blunt of that herb, and keep smokin till you get straight down to the roach. always works for me!

peace