The act of looking outside of your window and determining if it is a cold enough day to wear a sweater, jacket or just a t-shirt. It is determined by the amount of sunlight that is shining onto the ground and the amount of fog on your window.
Person 1: Hey dude do you think I need a jacket for when we go outside?

Person 2: Let me use my eyemometer and find out......no we don't need a jacket it's perfect outside.
by TheSafestDanger February 04, 2010

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