I asked because it snowed at a good clip for a few hours after 2 am. Also the 1.5 I measured at 5 PM on Monday was very light snow. The 16. 75 I measured on Tuesday morning was quite a bit heavier. And the top layer of snow was certainly a wetter and heavier snow than the lower layers of snow. Perhaps it it possible your measurement was impacted by compression of the snow as the snow got heavier and wetter.