I have kept a photographic diary from month to month for the last three years which helps with planning in the winter (because I forget how big things grow) and cheers me up with happy memories.
I can say without a doubt that my very sunny Kentish garden is at least 10 days behind last year, obviously due to the weather. Somethings also did extremely well out of all that rain including sedums, sempervivums, my Alpine Phlox, wildflower seedlings and self-seedlings and I think the Roses and Clematis kept their colour much better due to lack of harsh sunlight.
On the down side, my French beans are a million miles behind last year and my first batch of lettuce were ruined by slugs but luckily, my sweetcorn survived and my onions didn't go to seed! 
I also had a small miracle when I dug up a mature flowering current in full leaf and left it hanging around for a week in wet weather before deciding to replant it and it went on to flower and fruit without batting an eyelid!