This visualization plots NOAA monthly summary data for Oceanside and SFO as a scatterplot of average temperature over time, with points colored by temperature value and a tooltip showing the exact reading. The chart loads CSV data via d3.csv and renders with the Vega-Lite API, using vl.markCircle, vl.encode, and field mappings for the x-axis, y-axis, and color scale. Appearance is customized through a config object that adjusts axis ticks and label fonts for readability.