Al Kennedy

Hi, I'm a new Subaru owner - I bought my Outback this summer - and I really love the thing! But recently I've noticed as the weather gets colder it's not starting like it normally does. It seems that, at almost at random, it will just 'click' when I turn the key, but if I wait a minute or 2 and try it again it'll start up. It usually happens first thing in the morning, but today It happened every time I've tried to start it, and the last time this morning I had to try it about 4 times for it to fire up like normal. I don't know what it could be, the power doesn't go off inside the car during this time, so I don't know if it's the battery or not. It's making me a bit nervous, but before I just go and replace the battery I was wondering if anyone knows how to address this problem? It's a 2.5L with about 141Km, was supposedly serviced by the dealership for the ten years before I bought it. Thanks muchly!