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{  "$schema": "https://vega.github.io/schema/vega-lite/v4.json",  "data": {"url": "data/seattle-weather.csv"},  "layer": [    {      "mark": "bar",      "encoding": {        "x": {          "timeUnit": "month",          "field": "date",          "type": "ordinal"
        },        "y": {          "aggregate": "mean",          "field": "precipitation",          "type": "quantitative"        }      }    },    {      "mark": "rule",      "encoding": {        "y": {          "aggregate": "mean",          "field": "precipitation",          "type": "quantitative"        },        "color": {"value": "red"},        "size": {"value": 3}      }    }  ]}