Yesterday afternoon, while shooting in 88 degrees, my bow was right on. This morning, at 64 degrees, it was shooting nearly 2" lower at 20 yards, & at 30 yards so much lower that it would have cost me a kill. It took 6 clicks to bring it back on at 20 yards. I had noticed previously that the bow shot a bit lower when the humidity was high but this, as they say, is a whole new ballgame.