Woke up this morning and it was snowing sideways = bad cycling day (might try it anyway).

Big soft fluffy flakes = Beautiful day for a winter ride
Big half frozen globs of frozen rain/snow that splat when they hit = Ridable with the right gear but watch your road conditions
Lake effects snow in Great Lakes region = Where'd everybody go?
Any snow in Florida = Immediate life threat, stay indoors, wear several layers of t-shirts and find socks.
Two feet of snow with high winds in Lake of the Woods, MN = Tuesday (yeah, I borrowed that from Sixty fiver)