USA
San Francisco is the city where summer is the coldest season. The famously misattributed Mark Twain quote ('the coldest winter I ever spent was a summer in San Francisco') exists because June Gloom, No-Sky July, and 'Fogust' are all real. Layers are not 'extra' here — they're infrastructure. Microclimates shift block to block: foggy in the Richmond, sunny in the Mission, ten degrees apart.