table2.vl

{
    "config": {
        "scale": {
            "rangeStep": 13
        },
        "view": {
            "strokeWidth": 0
        },
        "axis": {
            "domain": false
        }
    },
    "mark": "rect",
    "data": {
        "url": "https://vega.github.io/vega-lite/data/seattle-temps.csv"
    },
    "$schema": "https://vega.github.io/schema/vega-lite/v3.json",
    "encoding": {
        "color": {
            "field": "temp",
            "aggregate": "max",
            "type": "quantitative",
            "legend": {
                "title": null
            }
        },
        "x": {
            "field": "date",
            "timeUnit": "date",
            "type": "ordinal",
            "axis": {
                "labelAngle": 0,
                "format": "%e",
                "title": "Day"
            }
        },
        "y": {
            "field": "date",
            "timeUnit": "month",
            "type": "ordinal",
            "axis": {
                "title": "Month"
            }
        }
    },
    "description": "Annual weather 'heatmap'"
}