In reply to hokkyokusei:
I seem to find it easier to motivate myself to get out in winter because it's always dark and cold. In the summer you're thinking "hmmm, it's not very nice today, maybe I should leave it till tomorrow" or if it's nice you're thinking "lets have a BBQ and scrap the run". In the winter the weather doesn't even matter, it's usually shit so it's not going to enter your decision making process over whether to go out or not, what else are you going to do, watch TV? Bleurgh. You could always take a self timer photo of yourself sitting in front of the telly in your boxers eating a greasy pizza and every time you don't feel like going for a run get it out the draw and have a peek at what the alternative is?
I like running in the rain anyway though, tramping through the woods, squelching through the mud with the head torch picking every rain drop out. And when it's really pouring you've got it all to yourself, because most people are inside. Maybe if you become anti-social you'll enjoy the rain more? No barking dogs, no screaming kids, no
real runners twice your age sailing past you.
I find leaving my running gear sitting out for when I get in/get up helps, once you're getting into your running gear on autopilot then the battle's won and like everyone says once you're out it's fine. Once you get into the habit of just going it makes it easier to just go, once you get into the habit of backing out it makes it easier to back out.