Somerville parking: when do I have to move my car?

[volantwish]

This is my first year parking on the street during the snowy season, so I have a question that might be kind of silly. (I looked back in the archives a bit, and I couldn't find anything relevant, though...)

I remember reading somewhere on the Somerville website (though I can't find a link now) that a car can't be parked in the same on-street space for more than X days, even with a valid resident permit.

Is this actually a rule? If so, how many days are you allowed to go without moving your car? And is this rule actually enforced during winter?

I left my car in a nice spot on the odd-numbered side of my street before I left town last weekend, and I'd really like to not have to shovel it out before I actually need to use the car. Or possibly until spring.

Any insights would be greatly appreciated :)

Edit: Thanks, everyone, for the information. I put on my big girl pants and dug the car out tonight. This stuff is surprisingly light, for how deep it is!