Where Karl the Fog and a tech hiring cycle replace heat and cold as the drivers of a year-round service market.
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San Francisco averages just 3 days above 90°F per year and zero nights at or below freezing, making it one of the few major US metros where neither summer cooling emergencies nor winter heating failures define the service calendar. Service demand here runs on different forces: a fog-driven marine layer that accelerates moisture damage on a housing stock of Victorian and Edwardian homes, and a tech economy that sends tens of thousands of workers relocating through the Bay Area each year on hiring-cycle schedules. Mandatory seismic retrofit requirements add a third driver, creating a permit-driven pipeline for structural contractors that fills project calendars independent of weather or season.
San Francisco averages just 3 days above 90°F per year and zero nights at or below freezing, placing it among the mildest large US cities by climate, meaning service demand runs on fog and tech-worker churn more than on weather emergencies, with seismic permit cycles adding a third year-round driver, and businesses with year-round search visibility capture clients in every month rather than competing for a concentrated seasonal window.
Note: wet season from November through April with Pacific storms bringing most of the annual precipitation, and a summer marine layer from June through October that keeps summer temperatures among the lowest of major US cities affects local service demand patterns.
What the San Francisco climate means for local businesses.
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