BillyS - 4:02 am on Jan 9, 2009 (gmt 0)
Is that a convention for those that are using 0.5 C increments? And you're right, for the most part we (in the US) talk about weather in the low 20s. I don't think many people can tell the difference between 21F and 22F. It's accuracy that does not really matter unless we're "above or below" the freezing point.