3. There are magical, magical years where cultural summer is 15 weeks long, instead of 14. It’s a trick of the calendar; when the last monday in May is as early as it can be, and the first monday in September is as late as it can be, an extra week slips in between the two. This graphic highlights the years with these super extend-o summers. Alas, 2014 is a regular 14-week season. But next year and 2020 will both offer up an extra seven days for beaches, cookouts, and sundowners. Let’s get started.