wind

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.axis--x path {
  display: none;
}

.area {
  fill: none;
    stroke: black;
  clip-path: url(#clip);
}
  .area1 {
  fill: none;
    stroke: red;
  clip-path: url(#clip);
}
  .area2 {
  fill: none;
    stroke: orange;
  clip-path: url(#clip);
}

.zoom {
  cursor: move;
  fill: none;
  pointer-events: all;
}
 
  .modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    padding-top: 100px; /* Location of the box */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
}

/* Modal Content */
.modal-content {
    background-color: #cccccc;
    margin: auto;
    padding: 20px;
    border: 1px solid #303030;
    width: 80%;
}

/* The Close Button */
.close {
    color: #aaaaaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: #000;
    text-decoration: none;
    cursor: pointer;
}
  
  
</style>
<button id="myBtn">Help</button>
<div id="myModal" class="modal">

<div class="modal-content">
    <span class="close">×</span>
    <p>To turn on or off a variable in the graph click on the black button on the right side.<br> To zoom in or out on the graph use to fingers and bring them together, or pull them apart. <br>To move on the graph hold your finger down and slide in the direction you want to go. </p>
    <h1>Trends</h1>
    <p>Notice that humidity and temperature are often opposite, this is because cooler air can hold less moisture. When does precipiation occur in relation to humidity and temperature?</p>
  </div>
</div>

var format = d3.timeParse("%Y-%m-%dT%H:%M:%SZ");

var x = d3.scaleTime()
    .rangeRound([0, width]);
  var x2 = d3.scaleTime()
    .rangeRound([0, width]);
 
var y = d3.scaleLinear()
    .rangeRound([height, 0]);
 var y2 = d3.scaleLinear()
    .rangeRound([height2, 0]); 
  var y3 = d3.scaleLinear()
    .rangeRound([height, 0]);
 
  var y32 = d3.scaleLinear()
    .rangeRound([height2, 0]);
  var y4 = d3.scaleLinear()
    .rangeRound([height, 0]);
 
  var y42 = d3.scaleLinear()
    .rangeRound([height2, 0]);

// load the data
d3.json("data2.json", function(error, data) {
  var obs = data[0].STATION[0].OBSERVATIONS;
	var dates = obs.date_time.map(format);
  var wind = obs.wind_speed_set_1 
var windg = obs.wind_gust_set_1 
var windd = obs.wind_direction_set_1 
var humid = obs.relative_humidity_set_1 
var solar = obs.solar_radiation_set_1 
var precip = obs.precip_accum_set_1 
	var air = obs.air_temp_set_1.map(function(d){ return +d; });

data.date = dates;
	data.air = air;
data.wind=wind;  
  data.windg=windg;
data.windd=windd;
  data.humid=humid;
  data.solar=solar;
  data.precip=precip;
console.log(data.solar);
  
  // scale the range of the data
  x.domain(d3.extent(data.date));
  y.domain(d3.extent(data.windg));
x2.domain(x.domain());
  y2.domain(y.domain());
  y3.domain(d3.extent(data.windg));
  y32.domain(y3.domain());
y4.domain(d3.extent(data.solar));
 y42.domain(y4.domain()); 
  data.airTempByDate = data.date.map(function(d, i){
    return {
        date: d,
        wind: wind[i],
   windg: windg[i],
    solar:solar[i]  
    };
	})

focus.append("path")
      .datum(data.airTempByDate)
      .attr("class", "area2")
  .attr("id","greenLine")
      .attr("d", lineee);
  
  focus.append("path")
      .datum(data.airTempByDate)
      .attr("class", "area1")
  .attr("id","redLine")
      .attr("d", linee);
  
 focus.append("path")
      .datum(data.airTempByDate)
      .attr("class", "area")
 .attr("id","blueLine")
      .attr("d", area);

focus.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));

focus.append("g")
      .attr("class", "axis axis--y")
  .attr("id","blueLine1")
  .attr("stroke","black")
      .call(d3.axisLeft(y))
  .call(d3.axisLeft(y3));
  focus.append("g")
      .attr("class", "axis axis--y")
  
 // .attr("stroke","green")
  //.attr("id","redLine1")
    //  .call(d3.axisRight(y3));
  
  focus.append("g")
      .attr("class", "axis axis--y")
  .attr("transform", "translate( " + width + ", 0 )")
  .attr("stroke","orange")
   .attr("id","greenLine1")
      .call(d3.axisLeft(y4));

context.append("path")
      .datum(data.airTempByDate)
      .attr("class", "area")
  .attr("id","blueLine2")
      .attr("d", area2);
 
  context.append("path")
      .datum(data.airTempByDate)
      .attr("class", "area1")
  .attr("id","redLine2")
      .attr("d", linee2);
context.append("path")
      .datum(data.airTempByDate)
      .attr("class", "area2")
 .attr("id","greenLine2")
      .attr("d", lineee2);

context.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height2 + ")")
      .call(d3.axisBottom(x2));

context.append("g")
      .attr("class", "brush")
      .call(brush)
      .call(brush.move, x.range());

svg.append("rect")
      .attr("class", "zoom")
      .attr("width", width)
      .attr("height", height)
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
      .call(zoom);

////off and onn
  svg.append("rect")
.attr("x", 898)         
    .attr("y", height + margin.top + -216) 
.attr("height", 20)    
    .attr("width", 50)
.attr("fill", "black")
.style("stroke", "black");
  svg.append("text")
     .attr("x", 900)             
     .attr("y", height + margin.top + -200)    
     .attr("class", "legend")
     .style("fill", "red")         
     .on("click", function(){
       // determine if current line is visible
       var active   = blueLine1.active ? false : true,
       newOpacity = active ? 0 : 1;
       // hide or show the elements
       d3.select("#blueLine1").style("opacity", newOpacity);
   d3.select("#blueLine").style("opacity", newOpacity);
    d3.select("#blueLine2").style("opacity", newOpacity);
    d3.select("#blueLine4").style("opacity", newOpacity);
    d3.select("#redLine").style("opacity", newOpacity);
    d3.select("#redLine2").style("opacity", newOpacity);
    d3.select("#redLine4").style("opacity", newOpacity);
       // update whether or not the elements are active
       blueLine1.active = active;
     })
     .text("Temp");
svg.append("rect")
.attr("x", 898)         
    .attr("y", height + margin.top + -195) 
.attr("height", 20)    
    .attr("width", 50)
.attr("fill", "black")
.style("stroke", "black");
  svg.append("text")
     .attr("x", 900)             
     .attr("y", height + margin.top + -180)    
     .attr("class", "legend")
     .style("fill", "green")         
     .on("click", function(){
       // determine if current line is visible
       var active   = redLine1.active ? false : true,
       newOpacity = active ? 0 : 1;
       // hide or show the elements
       d3.select("#redLine1").style("opacity", newOpacity);
   d3.select("#redLine").style("opacity", newOpacity);
    d3.select("#redLine2").style("opacity", newOpacity);
    d3.select("#redLine4").style("opacity", newOpacity);
       // update whether or not the elements are active
       redLine1.active = active;
     })
     .text("Humid");
  svg.append("rect")
.attr("x", 898)         
    .attr("y", height + margin.top + -174) 
.attr("height", 20)    
    .attr("width", 50)
.attr("fill", "black")
.style("stroke", "black");
  svg.append("text")
     .attr("x", 900)             
     .attr("y", height + margin.top + -160)    
     .attr("class", "legend")
     .style("fill", "blue")         
     .on("click", function(){
       // determine if current line is visible
       var active   = greenLine1.active ? false : true,
       newOpacity = active ? 0 : 1;
       // hide or show the elements
       d3.select("#greenLine1").style("opacity", newOpacity);
   d3.select("#greenLine").style("opacity", newOpacity);
    d3.select("#greenLine2").style("opacity", newOpacity);
     d3.select("#greenLine4").style("opacity", newOpacity);
       // update whether or not the elements are active
       greenLine1.active = active;
     })
     .text("Precip");

svg.append("text")
 .attr("id","blueLine4")
      .attr("transform", "rotate(-90)")
      .attr("y", 15)
      .attr("x", -253)
 .attr("fill","black")
     .text("Wind Speed (m/s)");
  svg.append("text")
  .attr("id","redLine4")
      .attr("transform", "rotate(-90)")
      .attr("y", 31)
      .attr("x", -240)
  .attr("fill","red")
     .text("Wind Gust");
  svg.append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 879)
      .attr("x", -272)
  .attr("id","greenLine4")
  .attr("fill","orange")
     .text("Solar Radiation(W/m^2)");
   svg.append("text")
   .attr("x", 900)             
     .attr("y", height + margin.top + -222) 
 .text("On/Off");

});
  
 function brushed() {
  if (d3.event.sourceEvent && d3.event.sourceEvent.type === "zoom") return; // ignore brush-by-zoom
  var s = d3.event.selection || x.range();
  x.domain(s.map(x.invert, x));
   focus.selectAll(".area2").attr("d", lineee);
  focus.selectAll(".area1").attr("d", linee);
   focus.selectAll(".area").attr("d", area);
focus.selectAll(".axis--x").call(d3.axisBottom(x));
  svg.selectAll(".zoom").call(zoom.transform, d3.zoomIdentity
      .scale(width / (s[1] - s[0]))
      .translate(-s[0], 0));
   
     
}
  
function zoomed() {
  if (d3.event.sourceEvent && d3.event.sourceEvent.type === "brush") return; // ignore zoom-by-brush
  var t = d3.event.transform;
  x.domain(t.rescaleX(x2).domain());
  focus.selectAll(".area2").attr("d", lineee);
  focus.selectAll(".area1").attr("d", linee);
focus.selectAll(".area").attr("d", area);
  focus.select(".axis--x").call(d3.axisBottom(x));
  context.select(".brush").call(brush.move, x.range().map(t.invertX, t));
  
}
  
  // Get the modal
var modal = document.getElementById('myModal');

// Get the button that opens the modal
var btn = document.getElementById("myBtn");

// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];

// When the user clicks the button, open the modal
btn.onclick = function() {
    modal.style.display = "block";
}

// When the user clicks on <span> (x), close the modal
span.onclick = function() {
    modal.style.display = "none";
}

// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
    if (event.target == modal) {
        modal.style.display = "none";
    }
}
  
</script>

https://d3js.org/d3.v4.min.js