date2

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

.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);
}
   .area3 {
  fill: none;
    stroke: pink;
  clip-path: url(#clip);
}

.zoom {
  cursor: move;
  fill: none;
  pointer-events: all;
}
  ////*style of the modal used for the help button popup */
  .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 of help popup */
.modal-content {
    background-color: #cccccc;
    margin: auto;
    padding: 20px;
    border: 1px solid #303030;
    width: 80%;
}

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

.close:hover,
.close:focus {
    color: #000;
    text-decoration: none;
    cursor: pointer;
}
  circle {
    fill: steelblue;
   clip-path: url(#clip)
}

</style>

////*create variable for each object needed represented and the zoom/toggle function */
  var brush = d3.brushX()
    .extent([[0, 0], [width, height2]])
    .on("brush end", brushed);
  
  var zoom = d3.zoom()
    .scaleExtent([1, Infinity])
    .translateExtent([[0, 0], [width, height]])
    .extent([[0, 0], [width, height]])
    .on("zoom", zoomed);
  
  var area = d3.area()
    .curve(d3.curveMonotoneX)
    .x(function(d,i) { return x(d.date2); })
    .y0(height)
    .y1(function(d, i) { return y(d.wind); })
  ;
 
  
  var linee = d3.area()
  .curve(d3.curveMonotoneX)
    .x(function(d,i) { return x(d.date2); })
  .y0(height)
    .y1(function(d,i) { return y3(d.windg); });
  
 var lineee = d3.area()
  .curve(d3.curveMonotoneX)
    .x(function(d,i) { return x(d.date2); })
  .y0(height)
    .y1(function(d,i) { return y4(d.solar); }); 
  var lineeee = d3.area()
  .curve(d3.curveMonotoneX)
    .x(function(d,i) { return x3(d.date); })
  .y0(height)
    .y1(function(d,i) { return y5(d.windd); });
  
  
  var area2 = d3.area()
    .curve(d3.curveMonotoneX)
    .x(function(d,i) { return x2(d.date2); })
    .y0(height2)
    .y1(function(d,i) { return y2(d.wind); });
  var linee2 = d3.area()
  .curve(d3.curveMonotoneX)
    .x(function(d,i) { return x2(d.date2); })
  .y0(height2)
    .y1(function(d,i) { return y32(d.windg); });
  var lineee2 = d3.area()
  .curve(d3.curveMonotoneX)
    .x(function(d,i) { return x2(d.date2); })
  .y0(height)
    .y1(function(d,i) { return y42(d.solar); });
  
  var lineeee2 = d3.area()
  .curve(d3.curveMonotoneX)
    .x(function(d,i) { return x2(d.date); })
  .y0(height)
    .y1(function(d,i) { return y52(d.windd); });
  
  svg.append("defs").append("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("width", width)
    .attr("height", height);

// load the data, the date 2 object is faked...will have a date for each parmaeter 
d3.json("data2.json", function(error, data) {
  var obs = data[0].STATION[0].OBSERVATIONS;
	var dates = obs.date_time.map(format);
  var date2 = obs.date_time2.map(format);//// creating 2nd dates object
  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.date2= date2; ////calling 2nd dates object in
  data.air = air;
data.wind=wind;  
  data.windg=windg;
data.windd=windd;
  data.humid=humid;
  data.solar=solar;
  data.precip=precip;

// scale the range of the data
  x.domain(d3.extent(data.date));
  x3.domain(d3.extent(data.date2));
  y.domain(d3.extent(data.windg));
x2.domain(x3.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()); 
  y5.domain(d3.extent(data.windd));
 y52.domain(y5.domain()); 
  data.airTempByDate = data.date.map(function(d, i){
    return {
        date: d,
      date2:date2[i],
        wind: wind[i],
   windg: windg[i],
    solar:solar[i],  
      windd: windd[i]
    };
	})
 
  //var colorMap = ["lightblue"];
 //var colorScale = d3.scaleLinear().rangeRound([height, 0]) .range(colorMap);
 
 focus.append("g").attr("id","redLine6").selectAll("dot")

.data(data.airTempByDate)
   .enter().append("svg:circle")
           .attr("r",radius)
 .attr("cx",function(d){return x3(d.date);})
           .attr("cy",function(d){return y5(d.windd);})

;
 
			//.style("fill",function(d,i){return colorScale(i);})
          //.on("mouseover",function(d){
          //   d3.select(this).style("fill","orange").append("svg:title")
           //                 .text(d.windd+"("+d.date+""+")");
           //}).on("mouseout",function(d,i){
          //   d3.select(this).style("fill",colorScale(i));
            // d3.select(this).select("title").remove();
          // }); 
  var dot1 = context.selectAll("dot").data(data.airTempByDate).enter().append("circle")
           .attr("r",radius1)
 .attr("cx",function(d){return x3(d.date);})
           .attr("cy",function(d){return y52(d.windd);})
 
   
  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(x3));

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.axisRight(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", 902)             
     .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);
     d3.select("#redLine5").style("opacity", newOpacity);
     d3.select("#redLine6").style("opacity", newOpacity);
     d3.select("#redLine7").style("opacity", newOpacity);
     d3.select("#redLine8").style("opacity", newOpacity);
     d3.select("#redLine9").style("opacity", newOpacity);
    d3.select("#redLine10").style("opacity", newOpacity);
       // update whether or not the elements are active
       blueLine1.active = active;
     })
     .text("Wind");

svg.append("rect")
.attr("x", 898)         
    .attr("y", height + margin.top + -193) 
.attr("height", 20)    
    .attr("width", 50)
.attr("fill", "black")
.style("stroke", "black");
  svg.append("text")
     .attr("x", 904)             
     .attr("y", height + margin.top + -178)    
     .attr("class", "legend")
     .style("fill", "orange")         
     .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);
    d3.select("redLine2").style("opacity", newOpacity);
       // update whether or not the elements are active
       greenLine1.active = active;
     })
     .text("Solar");

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.select("circle").attr("cx", function(d) { return x(d.date2); })
   ;

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(x3).domain());
  focus.selectAll(".area2").attr("d", lineee);
  focus.selectAll(".area1").attr("d", linee);
focus.selectAll(".area").attr("d", area);
focus.selectAll("circle")
.attr("cx", function(d) { return x(d.date2); })
      ;

//Ensure the date shifts with zoom//
  focus.select(".axis--x").call(d3.axisBottom(x));///labels  x axis
  context.select(".brush").call(brush.move, x.range().map(t.invertX, t));
  
}
  
  svg.append("text")
  .style("fill", "steelblue") 
  .attr("id","redLine5")
   .attr("x", 60)             
     .attr("y", height + margin.top + -364) 
 .text("North");
  svg.append("text")
  .style("fill", "steelblue")
  .attr("id","redLine10")
   .attr("x", 60)             
     .attr("y", height + margin.top + -9) 
 .text("North");
  svg.append("text")
  .style("fill", "steelblue")
  .attr("id","redLine7")
   .attr("x", 60)             
     .attr("y", height + margin.top + -187) 
 .text("South");
  svg.append("text")
  .style("fill", "steelblue")
  .attr("id","redLine8")
   .attr("x", 60)             
     .attr("y", height + margin.top + -111) 
 .text("East");
  svg.append("text")
  .style("fill", "steelblue")
  .attr("id","redLine9")
   .attr("x", 60)             
     .attr("y", height + margin.top + -265) 
 .text("West");

</script>

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