This visualization shows a bar chart of temperature readings over time, using a small multiple of vertical bars to represent each data point. The chart is built with the Vega-Lite API, which is registered alongside Vega, Vega-Lite, and Vega-Tooltip. The visualization loads CSV data from a GitHub gist using `d3.csv` via the `getData` function, and applies a custom config object to style axes and labels. Bars are rendered with a fixed size of 5 pixels, and tooltips display the temperature value on hover.