I noticed after not riding the bike for a week or so that the rear brake squeaks when moving the bike around. And the front brakes squeak when braking. This did not happen when i first had the bike. Could the fact its now winter be a factor? It's the only thing i can think of that is different!

Brake pads could have worn down a bit.. this might cause a rattle / squeek.

Are they binding at all? could be a sticky piston

Copper grease between the break piston and the pads can often solve squeaky breaks?

Copper grease between the break piston and the pads can often solve squeaky breaks?