When the weather is cold / wet / miserable and the long-term forecast is for much more of the same, it's essential to avoid feeling down in the dumps, otherwise it's going to be a very long winter indeed. Instead of mooching around the house looking for biscuits to scoff on the sofa while watching trashy daytime telly, try to do something positive for yourself.
If you've been carrying a bit of excess baggage, use this opportunity while you're stuck indoors to address the issue, even if it's simply a case of dusting off your old exercise bike. If you're looking at increasing your job prospects do some research and use the internet to learn some new skills. If you're feeling a bit lonely take this opportunity to write a few long overdue emails to old friends (or, even nicer, write letters by hand!)
Just think; by next spring you could very well be slimmer, fitter, have new earning potential and have re-connected with some special people. Don't sit around waiting for good things to happen; MAKE them happen!