Pick a city. Each forecast is the average of six weather models, and each city's forecast is checked every night against a real weather station: an FMI station in Finland, the airport station elsewhere.
Ilma averages six forecast models: ECMWF AIFS and its ensemble, ECMWF IFS, MET Nordic, the Finnish Meteorological Institute's edited forecast and Open-Meteo. The shaded band on the chart shows how much the models disagree.
Accuracy is verified every night against 14 Finnish weather stations, and the results are shown on the page. The site claims to beat a competitor only when the difference is statistically significant.
Yes, for Finland. The map shows the newest radar scan from the Finnish Meteorological Institute and Ilma's estimate of where the rain moves in the next hour, in 5-minute steps. Each future frame shows how often that estimate has been right over the last week.