Scatterplot with rolling mean

using Deneb

data = Data(url="https://vega.github.io/vega-datasets/data/seattle-weather.csv")

line = Mark(:line, color=:red, size=3) * transform_window(
    rolling_mean="mean(temp_max)",
    frame=(-15, 15),
) * Encoding("date:T", "rolling_mean:Q")

points = Mark(:point, opacity=0.3) * Encoding(
    "date:T",
    y=field("temp_max:Q", title="Max Temperature and Rolling Mean")
)

chart = data * (points + line) * vlspec(width=400)

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