Temperature is definately a factor with mine. When the weather gets better I am going to check all grounds and the starter/solenoid. If its not there it may be in the ignition switch or somewhere else. The first time it happened to me I would get a light click when trying to crank and everything else would be functioning normally. Sometimes if I hold the key in the start position long enough it will magically decide to crank. Some may not know that the starter is electronically controlled. If you turn the key to start for just a split second the starter will spin until the car cranks(at least thats what mine used to do).