Line

<html lang = "en">
	<head>
		<meta charset = "utf-8">
		<title>Bar Chart</title>
		<script src="https://d3js.org/d3.v5.min.js"></script>
	</head>
	
	<body>
		<script type = "text/javascript">
		
		//width and height
		var w = 600;
		var h = 400;
		var padding = 15;
		var numBars = 5;
		
		var states = ["Alabama","Alaska","Arizona","Arkansas","California"];
		/*
		var dataset;
		//load data
		d3.csv('weather.csv', function(d) {
			//data.forEach(function(d) {
			//dataset.push(d.precipitation);
			return {
				//max: d.Maximum,
				//min: d.Minimum,
				//month: d.Month,
				precipitation: d.Precipitation
				//speed: d.Speed,
				//state: d.State,
				//year: d.Year
			};
		}, function(d) {
			dataset.push(d.precipitation); 
		});
		
		
		
		var temp;
		var string;
		for(var i = 0; i < numBars; i++) {
			string = dataset.get(i);
			state = states.get(i);
			temp = {state: string};
			dataset.push(temp);
		}*/
		
		//var dataset = data.slice(0, numBars + 1);
		dataset = [{state: "Alabama", value: 164.6},
					{state: "Alaska", value: 973.2},
					{state: "Arizona", value: 43.1},
					{state: "Arkansas", value: 96},
					{state: "California", value: 323.5}];
		
		//scale function
		var xScale = d3.scaleBand()
			//.domain(["Alabama","Alaska","Arizona","Arkansas","California"])
			.domain(d3.range(dataset.length))
			//.range([padding, w-padding * 2]);
			.rangeRound([0, w])
			.paddingInner(0.05);
			
		var yScale = d3.scaleLinear()
			.domain([0, d3.max(dataset, function(d) { return d.value; })])
			//.range([padding, w-padding * 2]);
			.range([0, h - padding]);
			
		var line = d3.line()
			.x(function(d, i ) { return 20 * i; } )
			.y(function(d) { return yScale(d.value) });
		
		//create svg element
		var svg = d3.select("body")
					.append("svg")
					.attr("width", w)
					.attr("height", h);
				
		var xAxis = d3.axisBottom().scale(xScale).ticks(5);
		
		var yAxis = d3.axisLeft().scale(yScale).ticks(5);		
					
		svg.selectAll("line")
			.data(dataset)
			.enter()
			.append("line")
			.attr("x", function(d, i) {
				return xScale(i);
			})
			.attr("y", function(d) {
				return h - yScale(d.value);
			})
			.attr("width", xScale.bandwidth())
			.attr("height", function(d) {
				return yScale(d.value);
			})
			.attr("fill", function(d) {
				return "rgb(0, " + (d.value * 0.5) + ", 50)";
			});
			
		svg.append("path") 
			.data(dataset)
			.attr("stroke", "blue")
			.attr("stroke-width", 1.5)
			.attr("d", line);
			
			//x axis
		svg.append("g")
			.attr("class", "x axis")	
			.attr("transform", "translate(0," + (h - padding) + ")")
			.call(xAxis);
		
		//y axis
		svg.append("g")
			.attr("class", "y axis")	
			.attr("transform", "translate(" + padding + ", 0)")
			.call(yAxis);

</script>
	</body>
</html>

https://d3js.org/d3.v5.min.js