Mark Twain’s quote “The coldest winter I ever spent was a summer in San Francisco” is often cited as a witty and apt expression of the unexpected weather in this city. This quote reminds us that even in summer it can be cold, while also inspiring us to look at things with perspective and humor. Today, this quote can serve as a reminder that not everything is as we expect, and that it is important to keep our sense of humor. Author: Mark Twain.