Survival kit against Versailles' winter

If you are, like me, unable to get used to the constant rain, grey sky and all in all sh*tty winter weather (and, mind you, this kind of weather lasts about 8 months in here, at least!), you absolutly need a plan in order not to sink into depression, especially when you are at the most difficult phase of the culture shock, the Negociation phase. As one who fortunately survived it (hey, I've applied for the French citizenship!...) I am happy to be able to give you some advice on how to overcome it with a fairly good degree of success.