[I’m sorry to pick on these illustrations. They are certainly not the only, or even the most egregious example of the kinds of seasonal produce charts I’ve been seeing lately.]
I keep seeing these posters and diagrams of what’s in season when, and they’re often lovely and attractively designed, but basically flawed. I can tell you when strawberries are generally ripe in Maine (except this year when the whole season was about a month early), but that has little to no bearing on when they’re ripe in Florida, or California, or Indiana. And that’s just the contiguous United States. This is a really big country with lots of climate zones.
I have a number of cookbooks that are organized by season. For the most part, given where I live, they’re all off by a month or two: I’m cooking from the spring section in early summer.
There is a reason we can get raspberries in February: they are actually in season somewhere in the world at that time.