Area with rolling mean

<Plot inset={5}>
    <AreaY
        data={sftemp}
        x="date"
        y1="low"
        y2="high"
        opacity="0.2" />
    <Line
        {...windowY(
            { data: sftemp, x: 'date', y: 'low' },
            { k, anchor, strict, reduce }
        )}
        stroke="var(--svp-blue)" />
    <Line
        {...windowY(
            { data: sftemp, x: 'date', y: 'high' },
            { k, anchor, strict, reduce }
        )}
        stroke="var(--svp-red)" />
    <AreaY
        {...windowY(
            {
                data: sftemp,
                x: 'date',
                y1: 'high',
                y2: 'low'
            },
            { k, anchor, strict, reduce }
        )}
        fillOpacity={0.15}
        fill="yellow"
        mixBlendMode="multiply" />
</Plot>