{ "$schema": "https://vega.github.io/schema/vega-lite/v4.json", "description": "Temperature in Seattle as a bar chart with yearmonth time unit.", "data": {"url": "data/seattle-weather.csv"}, "mark": "bar", "encoding": { "x": {"timeUnit": "yearmonth", "field": "date"}, "y": {"aggregate": "mean", "field": "temp_max"} }}