I have a 2006 model and I recently experienced issues with it starting. Doesn't matter the weather, time od day, place nothing. I have had the battery, started and alternator all checked and they are fine. Radio, power locks and windows all still work. If we have to jump it, it starts right up as if there is no issue.

 

Check all the connections from both terminals of the the battery to the starter motor for corrosion. Take each connection you can find apart, clean it and put it back together. Check the starter relay.

There are hundreds of parts involved in starting the car. It might help a little for people seeing your post to give some information about the car, like which model, engine, mileage.