Beating The Average Speed

Now it looks like Spring has finally arrived, I've started my usual weekly bike-training. I've only done three rides now about 50 km each and last sunday I finally cycled an average speed which gives me a bit of confidence about the shape I will be in this coming Summer.
Each year the starting of a new season is a bit of a mystery to me on what level my condition stand. I don't cycle indoors during Winter, so I have a bit of a set back in Spring to other cyclists who train on their spinning bikes during the cold months. I just try to ride as much as I can outdoors during Winter. Gives me more stamina and joy, especially when I can follow cyclist about half of my age from which I know they've trained all Winter in the gym on a spinning course.