what does the grey shaded area that goes up and down on the windy app forecast represent
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what does the grey shaded area that goes up and down on the windy app forecast represent? I drew a red line on top of the Grey area I'm wondering about.

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@Grant-Lockhart
This area shows the variation of the forecast temperature. You can check it by looking at maximum / minimum forecast temperature.
In the detailed forecast table you find a similar curve.
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