```{ojs}
// Set the dimensions of the graph
width = 800;
height = 500;
margin = {top: 20, right: 30, bottom: 40, left: 90};
// Set up scales
const xScale = d3.scaleBand()
.domain(filteredData.map(d => d.time))
.range([margin.left, width - margin.right])
.padding(0.1);
const yScale = d3.scaleLinear()
.domain([0, d3.max(filteredData, d => d.cloud_free_fraction)])
.nice()
.range([height - margin.bottom, margin.top]);
// SVG container
const svg = d3.create("svg")
.attr("viewBox", [0, 0, width, height]);
// Bars
svg.append("g")
.attr("fill", "steelblue")
.selectAll("rect")
.data(filteredData)
.join("rect")
.attr("x", d => xScale(d.time))
.attr("y", d => yScale(d.cloud_free_fraction))
.attr("height", d => yScale(0) - yScale(d.cloud_free_fraction))
.attr("width", xScale.bandwidth());
// X-axis
svg.append("g")
.attr("transform", `translate(0,${height - margin.bottom})`)
.call(d3.axisBottom(xScale));
// Y-axis
svg.append("g")
.attr("transform", `translate(${margin.left},0)`)
.call(d3.axisLeft(yScale));
return svg.node();
```