3 February:

In the Northern hemisphere, there are 88 days in winter (in a non-leap year, 89 in a leap year). We are considered halfway through winter on February 3.

Not! There are 89 days in northern winters. Or at least there will be for the next 5 years, since I *just* finished calculating this from the solar ephemera. Winter doesn't follow calendars; it's rather the other way around. The cross-quarter days fall on 4 February (in 2007, 2008, 2010, and 2011) or 5 February (2009 and 2012).