concatinated string to image url not working

Hi Anonymous ,

if its returning this:

https://openweathermap.org/img/wn/[email protected]

its mean that your calculate is returning blank as result, lets breakdown this.

1- I'm supposing that you're in WeatherWrzesnia table, where you want to create a calculated column ImageUrl.
2- with this, you can create a new calculated column using this DAX:

ImageUrl =
    "https://openweathermap.org/img/wn/" &
    CALCULATE(
        FIRSTNONBLANK(Weather[list.weather.icon], 1),
        FILTER(
            Weather,
            Weather[list.dt_txt] = WeatherWrzesnia[list.dt_txt]
        )
    ) &
    "@2x.png"

I'm not using MIN function, because calculated columns works in row context also.

let me now if this help you, try to debbug your DAX to see what the calculate returns.