Cold (often windy) but sunny weather that looks extremely pleasant through the window when one is inside, but is in fact quite uncomfortable to be outside in.

origin: An Icelandic expression: "Gluggaveður" (literally: Window-weather).
A-"have you looked outside? what a nice day we're having!"

B-"This looks like window weather to me. You should bring a jacket."
by Stabilo-Boss-original November 20, 2013
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