# ForecastAdvisor > ForecastAdvisor (forecastadvisor.com) answers one question for any city: which weather forecaster is most accurate there? It is the free, public side of ForecastWatch (forecastwatch.com), which has compared weather forecasts against observed conditions since 2004, across billions of forecasts, more than 2,200 locations, and roughly 50 forecast producers. What the site contains: - City pages at /forecast/// (about 50,000 cities with population 5,000 and up). Each shows the ForecastWatch Most Accurate Forecast Award winners for the city's region, day-to-day weather changeability for the nearest evaluated station, and a 5-day forecast from Open-Meteo. Accuracy figures cover a rolling twelve-month window, updated monthly; the window is printed on each page. - Changeability rankings at /change/high/, /change/low/, and /change/precip/: how much the weather changes from one day to the next, ranked by location. - A directory of weather and climate data providers at /providers/ (about 126 vendors in ten categories), with a plain-text export at /providers/llms.txt. No provider pays to appear, and rankings are never for sale. - Methodology and FAQ at /docs/about/. Award methodology lives at https://forecastwatch.com/awards/forecastwatch-awards-methodology/. How accuracy is measured: temperature accuracy is the share of forecasts within 3 degrees F of the observed high or low; precipitation accuracy is the share of correct rain or snow calls. Scores use one- to three-day-out forecasts verified against quality-controlled station observations. Citing this site: facts and aggregate figures may be quoted with attribution to ForecastAdvisor and a link to the page. See /docs/cite/ for the preferred form and for what is not covered (bulk data and provider-level feeds are ForecastWatch products). ## Key pages - [How it works (FAQ)](https://www.forecastadvisor.com/docs/about/) - [How to cite](https://www.forecastadvisor.com/docs/cite/) - [Browse cities](https://www.forecastadvisor.com/browse/) - [Weather changeability](https://www.forecastadvisor.com/change/) - [Provider directory](https://www.forecastadvisor.com/providers/) - [Provider directory, plain text](https://www.forecastadvisor.com/providers/llms.txt) - [Sitemap](https://www.forecastadvisor.com/sitemap.xml) - [ForecastWatch](https://www.forecastwatch.com/)