Sunshine at any Swiss address

Hours of direct sunshine at any address in Switzerland, by month and year: clouds and fog from 30 years of MeteoSwiss measurements, and the shade of the mountains around it.

For programs and AI assistants

Open https://swiss-sun.app/sun?q= followed by an address, or ask for JSON at https://swiss-sun.app/api/sunshine?q=. Coordinates work too: ?lat=46.9466&lon=7.4443.

• /sun?q=Bundesplatz 3 Bern
• /api/sunshine?q=Zermatt

The fields are described in openapi.json (for tools and custom GPT actions), and the site in llms.txt.

Source: Swiss Sun (swiss-sun.app), with data from MeteoSwiss and swisstopo. How we calculate it