Calculate UTCI

This block calculated Universal Thermal Climate Index (UTCI) or "feels like" temperature based on meteorological inputs of the following:

Air Temperature
Mean Radiant Temperature (MRT)
Wind Velocity
Relative Humidity

Built with blockbuilder.org

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
	<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    #inputSliders { font-family:sans-serif;outline:none;margin-top:100px}
    .inputgroup {border:none;}
    .slider { width:200px;float:left;padding:10px;}
    label { float:left;font-weight:bold;padding-bottom:10px;}
    input[type=range] { float:left;clear:left;margin-right:10px;width:120px;}
    input[type=range]::-ms-track { background: transparent;border-color: transparent;color: transparent;-webkit-appearance: none}
    input[type=range]::-webkit-slider-runnable-track { height: 5px;background:#7c7c7c; margin-top: -4px;}
    input[type=range]::-webkit-slider-thumb { margin-top:-6px;}
    #inputSliders p {padding-top:10px;}
    #airtemp {background-color:#fefcdc}
    #radtemp {background-color:#ffd7bc}
    #velocity {background-color:#cce1ee}
    #humidity {background-color:#c2e5a8}
  </style>
</head>

<body>
  <div id="inputSliders">
			<form id="sliders" autocomplete="off">
				<fieldset class="inputgroup">
          <div class="slider" id="airtemp">
					<label>Air Temperature</label>
					<input type="range" name="ta" id="ta" value="20" min="0" max="30" step = "0.5"><p id="taoutput">20 C</p></div>
          <div class="slider" id="radtemp">
          <label>MRT</label>
					<input type="range" name="tmrt" id="tmrt" value="20" min="0" max="30" step = "0.5"><p id="tmrtoutput">20 C</p></div>
          <div class="slider" id="velocity">
          <label>Wind Velocity</label>
					<input type="range" name="vel" id="vel" value="1" min="0" max="10" step = "0.1"><p id="veloutput">1 m/s</p></div>
          <div class="slider" id="humidity">
          <label>Relative Humidity</label>
					<input type="range" name="rh" id="rh" value="50" min="0" max="100"  step = "1"><p id="rhoutput">50 %</p></div>
				</fieldset>
			</form>
		</div>
  
  
  <script>
    // Get inputs for UTCI
    var Ta = parseFloat($("#ta").val()); // Air tmperature in Celcius
    var Tmrt = parseFloat($("#tmrt").val()); // Mean radiant tmperature in Celcius
    var va = parseFloat($("#vel").val()); // Wind velocity in m/s
    var RH = parseFloat($("#rh").val()); // Relative humidity in %
    var try2Save = null
    
    // Update inputs for UTCI
    $("#ta").on("input", function(event) {
      Ta = parseFloat($(this).val());
      $("#taoutput").text(Ta.toString() + " C");
      updateUTCI();
    });
    $("#tmrt").on("input", function(event) {
      Tmrt = parseFloat($(this).val());
      $("#tmrtoutput").text(Tmrt.toString() + " C");
      updateUTCI();
    });
    $("#vel").on("input", function(event) {
      va = parseFloat($(this).val());
      $("#veloutput").text(va.toString() + " m/s");
      updateUTCI();
    });
    $("#rh").on("input", function(event) {
      RH = parseFloat($(this).val());
      $("#rhoutput").text(RH.toString() + " %");
      updateUTCI();
    });
    
    
    // Function to calculate UTCI
    calcUTCI = function(Ta, Tmrt, va, RH){
      // Calculate vapor pressure from relative humidity.
      var g = [-2836.5744, -6028.076559, 19.54263612, -0.02737830188,
               0.000016261698, (7.0229056*(10**(-10))), (-1.8680009*(10**(-13)))]      
      var tk = Ta + 273.15 // air temp in K
      var es = 2.7150305 * Math.log(tk)
      for (i = 0; i < g.length; i++){
        es = es + (g[i] * (tk**(i-2)))
      }
      es = Math.exp(es)*0.01  // convert Pa to hPa
      var ehPa = es * (RH/100.0)
      
      var Pa = ehPa/10.0  // convert vapour pressure to kPa
      
      // Calculate MRT delta from MRT and air temperature
      var D_Tmrt = Tmrt - Ta

// Polynomial approximation for UTCI from Ta, Tmrt, va, and Pa(vapor pressue).
      var UTCIapprox = Ta +
              (0.607562052) +
              (-0.0227712343) * Ta +
              (8.06470249*(10**(-4))) * Ta * Ta +
              (-1.54271372*(10**(-4))) * Ta * Ta * Ta +
              (-3.24651735*(10**(-6))) * Ta * Ta * Ta * Ta +
              (7.32602852*(10**(-8))) * Ta * Ta * Ta * Ta * Ta +
              (1.35959073*(10**(-9))) * Ta * Ta * Ta * Ta * Ta * Ta +
              (-2.25836520) * va +
              (0.0880326035) * Ta * va +
              (0.00216844454) * Ta * Ta * va +
              (-1.53347087*(10**(-5))) * Ta * Ta * Ta * va +
              (-5.72983704*(10**(-7))) * Ta * Ta * Ta * Ta * va +
              (-2.55090145*(10**(-9))) * Ta * Ta * Ta * Ta * Ta * va +
              (-0.751269505) * va * va +
              (-0.00408350271) * Ta * va * va +
              (-5.21670675*(10**(-5))) * Ta * Ta * va * va +
              (1.94544667*(10**(-6))) * Ta * Ta * Ta * va * va +
              (1.14099531*(10**(-8))) * Ta * Ta * Ta * Ta * va * va +
              (0.158137256) * va * va * va +
              (-6.57263143*(10**(-5))) * Ta * va * va * va +
              (2.22697524*(10**(-7))) * Ta * Ta * va * va * va +
              (-4.16117031*(10**(-8))) * Ta * Ta * Ta * va * va * va +
              (-0.0127762753) * va * va * va * va +
              (9.66891875*(10**(-6))) * Ta * va * va * va * va +
              (2.52785852*(10**(-9))) * Ta * Ta * va * va * va * va +
              (4.56306672*(10**(-4))) * va * va * va * va * va +
              (-1.74202546*(10**(-7))) * Ta * va * va * va * va * va +
              (-5.91491269*(10**(-6))) * va * va * va * va * va * va +
              (0.398374029) * D_Tmrt +
              (1.83945314*(10**(-4))) * Ta * D_Tmrt +
              (-1.73754510*(10**(-4))) * Ta * Ta * D_Tmrt +
              (-7.60781159*(10**(-7))) * Ta * Ta * Ta * D_Tmrt +
              (3.77830287*(10**(-8))) * Ta * Ta * Ta * Ta * D_Tmrt +
              (5.43079673*(10**(-10))) * Ta * Ta * Ta * Ta * Ta * D_Tmrt +
              (-0.0200518269) * va * D_Tmrt +
              (8.92859837*(10**(-4))) * Ta * va * D_Tmrt +
              (3.45433048*(10**(-6))) * Ta * Ta * va * D_Tmrt +
              (-3.77925774*(10**(-7))) * Ta * Ta * Ta * va * D_Tmrt +
              (-1.69699377*(10**(-9))) * Ta * Ta * Ta * Ta * va * D_Tmrt +
              (1.69992415*(10**(-4))) * va*va*D_Tmrt +
              ( -4.99204314*(10**(-5)) ) * Ta*va*va*D_Tmrt +
              ( 2.47417178*(10**(-7)) ) * Ta*Ta*va*va*D_Tmrt +
              ( 1.07596466*(10**(-8)) ) * Ta*Ta*Ta*va*va*D_Tmrt +
              ( 8.49242932*(10**(-5)) ) * va*va*va*D_Tmrt +
              ( 1.35191328*(10**(-6)) ) * Ta*va*va*va*D_Tmrt +
              ( -6.21531254*(10**(-9)) ) * Ta*Ta*va*va*va*D_Tmrt +
              ( -4.99410301*(10**(-6)) ) * va*va*va*va*D_Tmrt +
              ( -1.89489258*(10**(-8)) ) * Ta*va*va*va*va*D_Tmrt +
              ( 8.15300114*(10**(-8)) ) * va*va*va*va*va*D_Tmrt +
              ( 7.55043090*(10**(-4)) ) * D_Tmrt*D_Tmrt +
              ( -5.65095215*(10**(-5)) ) * Ta*D_Tmrt*D_Tmrt +
              ( -4.52166564*(10**(-7)) ) * Ta*Ta*D_Tmrt*D_Tmrt +
              ( 2.46688878*(10**(-8)) ) * Ta*Ta*Ta*D_Tmrt*D_Tmrt +
              ( 2.42674348*(10**(-10)) ) * Ta*Ta*Ta*Ta*D_Tmrt*D_Tmrt +
              ( 1.54547250*(10**(-4)) ) * va*D_Tmrt*D_Tmrt +
              ( 5.24110970*(10**(-6)) ) * Ta*va*D_Tmrt*D_Tmrt +
              ( -8.75874982*(10**(-8)) ) * Ta*Ta*va*D_Tmrt*D_Tmrt +
              ( -1.50743064*(10**(-9)) ) * Ta*Ta*Ta*va*D_Tmrt*D_Tmrt +
              ( -1.56236307*(10**(-5)) ) * va*va*D_Tmrt*D_Tmrt +
              ( -1.33895614*(10**(-7)) ) * Ta*va*va*D_Tmrt*D_Tmrt +
              ( 2.49709824*(10**(-9)) ) * Ta*Ta*va*va*D_Tmrt*D_Tmrt +
              ( 6.51711721*(10**(-7)) ) * va*va*va*D_Tmrt*D_Tmrt +
              ( 1.94960053*(10**(-9)) ) * Ta*va*va*va*D_Tmrt*D_Tmrt +
              ( -1.00361113*(10**(-8)) ) * va*va*va*va*D_Tmrt*D_Tmrt +
              ( -1.21206673*(10**(-5)) ) * D_Tmrt*D_Tmrt*D_Tmrt +
              ( -2.18203660*(10**(-7)) ) * Ta*D_Tmrt*D_Tmrt*D_Tmrt +
              ( 7.51269482*(10**(-9)) ) * Ta*Ta*D_Tmrt*D_Tmrt*D_Tmrt +
              ( 9.79063848*(10**(-11)) ) * Ta*Ta*Ta*D_Tmrt*D_Tmrt*D_Tmrt +
              ( 1.25006734*(10**(-6)) ) * va*D_Tmrt*D_Tmrt*D_Tmrt +
              ( -1.81584736*(10**(-9)) ) * Ta*va*D_Tmrt*D_Tmrt*D_Tmrt +
              ( -3.52197671*(10**(-10)) ) * Ta*Ta*va*D_Tmrt*D_Tmrt*D_Tmrt +
              ( -3.36514630*(10**(-8)) ) * va*va*D_Tmrt*D_Tmrt*D_Tmrt +
              ( 1.35908359*(10**(-10)) ) * Ta*va*va*D_Tmrt*D_Tmrt*D_Tmrt +
              ( 4.17032620*(10**(-10)) ) * va*va*va*D_Tmrt*D_Tmrt*D_Tmrt +
              ( -1.30369025*(10**(-9)) ) * D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt +
              ( 4.13908461*(10**(-10)) ) * Ta*D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt +
              ( 9.22652254*(10**(-12)) ) * Ta*Ta*D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt +
              ( -5.08220384*(10**(-9)) ) * va*D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt +
              ( -2.24730961*(10**(-11)) ) * Ta*va*D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt +
              ( 1.17139133*(10**(-10)) ) * va*va*D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt +
              ( 6.62154879*(10**(-10)) ) * D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt +
              ( 4.03863260*(10**(-13)) ) * Ta*D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt +
              ( 1.95087203*(10**(-12)) ) * va*D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt +
              ( -4.73602469*(10**(-12))) * D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt +
              ( 5.12733497) * Pa +
              ( -0.312788561) * Ta*Pa +
              ( -0.0196701861 ) * Ta*Ta*Pa +
              ( 9.99690870*(10**(-4)) ) * Ta*Ta*Ta*Pa +
              ( 9.51738512*(10**(-6)) ) * Ta*Ta*Ta*Ta*Pa +
              ( -4.66426341*(10**(-7)) ) * Ta*Ta*Ta*Ta*Ta*Pa +
              ( 0.548050612 ) * va*Pa +
              ( -0.00330552823) * Ta*va*Pa +
              ( -0.00164119440 ) * Ta*Ta*va*Pa +
              ( -5.16670694*(10**(-6)) ) * Ta*Ta*Ta*va*Pa +
              ( 9.52692432*(10**(-7)) ) * Ta*Ta*Ta*Ta*va*Pa +
              ( -0.0429223622 ) * va*va*Pa +
              ( 0.00500845667 ) * Ta*va*va*Pa +
              ( 1.00601257*(10**(-6)) ) * Ta*Ta*va*va*Pa +
              ( -1.81748644*(10**(-6)) ) * Ta*Ta*Ta*va*va*Pa +
              ( -1.25813502*(10**(-3)) ) * va*va*va*Pa +
              ( -1.79330391*(10**(-4)) ) * Ta*va*va*va*Pa +
              ( 2.34994441*(10**(-6)) ) * Ta*Ta*va*va*va*Pa +
              ( 1.29735808*(10**(-4)) ) * va*va*va*va*Pa +
              ( 1.29064870*(10**(-6)) ) * Ta*va*va*va*va*Pa +
              ( -2.28558686*(10**(-6)) ) * va*va*va*va*va*Pa +
              ( -0.0369476348 ) * D_Tmrt*Pa +
              ( 0.00162325322 ) * Ta*D_Tmrt*Pa +
              ( -3.14279680*(10**(-5)) ) * Ta*Ta*D_Tmrt*Pa +
              ( 2.59835559*(10**(-6)) ) * Ta*Ta*Ta*D_Tmrt*Pa +
              ( -4.77136523*(10**(-8)) ) * Ta*Ta*Ta*Ta*D_Tmrt*Pa +
              ( 8.64203390*(10**(-3)) ) * va*D_Tmrt*Pa +
              ( -6.87405181*(10**(-4)) ) * Ta*va*D_Tmrt*Pa +
              ( -9.13863872*(10**(-6)) ) * Ta*Ta*va*D_Tmrt*Pa +
              ( 5.15916806*(10**(-7)) ) * Ta*Ta*Ta*va*D_Tmrt*Pa +
              ( -3.59217476*(10**(-5)) ) * va*va*D_Tmrt*Pa +
              ( 3.28696511*(10**(-5)) ) * Ta*va*va*D_Tmrt*Pa +
              ( -7.10542454*(10**(-7)) ) * Ta*Ta*va*va*D_Tmrt*Pa +
              ( -1.24382300*(10**(-5)) ) * va*va*va*D_Tmrt*Pa +
              ( -7.38584400*(10**(-9)) ) * Ta*va*va*va*D_Tmrt*Pa +
              ( 2.20609296*(10**(-7)) ) * va*va*va*va*D_Tmrt*Pa +
              ( -7.32469180*(10**(-4)) ) * D_Tmrt*D_Tmrt*Pa +
              ( -1.87381964*(10**(-5)) ) * Ta*D_Tmrt*D_Tmrt*Pa +
              ( 4.80925239*(10**(-6)) ) * Ta*Ta*D_Tmrt*D_Tmrt*Pa +
              ( -8.75492040*(10**(-8)) ) * Ta*Ta*Ta*D_Tmrt*D_Tmrt*Pa +
              ( 2.77862930*(10**(-5)) ) * va*D_Tmrt*D_Tmrt*Pa +
              ( -5.06004592*(10**(-6)) ) * Ta*va*D_Tmrt*D_Tmrt*Pa +
              ( 1.14325367*(10**(-7)) ) * Ta*Ta*va*D_Tmrt*D_Tmrt*Pa +
              ( 2.53016723*(10**(-6)) ) * va*va*D_Tmrt*D_Tmrt*Pa +
              ( -1.72857035*(10**(-8)) ) * Ta*va*va*D_Tmrt*D_Tmrt*Pa +
              ( -3.95079398*(10**(-8)) ) * va*va*va*D_Tmrt*D_Tmrt*Pa +
              ( -3.59413173*(10**(-7)) ) * D_Tmrt*D_Tmrt*D_Tmrt*Pa +
              ( 7.04388046*(10**(-7)) ) * Ta*D_Tmrt*D_Tmrt*D_Tmrt*Pa +
              ( -1.89309167*(10**(-8)) ) * Ta*Ta*D_Tmrt*D_Tmrt*D_Tmrt*Pa +
              ( -4.79768731*(10**(-7)) ) * va*D_Tmrt*D_Tmrt*D_Tmrt*Pa +
              ( 7.96079978*(10**(-9)) ) * Ta*va*D_Tmrt*D_Tmrt*D_Tmrt*Pa +
              ( 1.62897058*(10**(-9)) ) * va*va*D_Tmrt*D_Tmrt*D_Tmrt*Pa +
              ( 3.94367674*(10**(-8)) ) * D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt*Pa +
              ( -1.18566247*(10**(-9)) ) * Ta*D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt*Pa +
              ( 3.34678041*(10**(-10)) ) * va*D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt*Pa +
              ( -1.15606447*(10**(-10)) ) * D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt*Pa +
              ( -2.80626406 ) * Pa*Pa +
              ( 0.548712484 ) * Ta*Pa*Pa +
              ( -0.00399428410 ) * Ta*Ta*Pa*Pa +
              ( -9.54009191*(10**(-4)) ) * Ta*Ta*Ta*Pa*Pa +
              ( 1.93090978*(10**(-5)) ) * Ta*Ta*Ta*Ta*Pa*Pa +
              ( -0.308806365 ) * va*Pa*Pa +
              ( 0.0116952364 ) * Ta*va*Pa*Pa +
              ( 4.95271903*(10**(-4)) ) * Ta*Ta*va*Pa*Pa +
              ( -1.90710882*(10**(-5)) ) * Ta*Ta*Ta*va*Pa*Pa +
              ( 0.00210787756 ) * va*va*Pa*Pa +
              ( -6.98445738*(10**(-4)) ) * Ta*va*va*Pa*Pa +
              ( 2.30109073*(10**(-5)) ) * Ta*Ta*va*va*Pa*Pa +
              ( 4.17856590*(10**(-4)) ) * va*va*va*Pa*Pa +
              ( -1.27043871*(10**(-5)) ) * Ta*va*va*va*Pa*Pa +
              ( -3.04620472*(10**(-6)) ) * va*va*va*va*Pa*Pa +
              ( 0.0514507424 ) * D_Tmrt*Pa*Pa +
              ( -0.00432510997 ) * Ta*D_Tmrt*Pa*Pa +
              ( 8.99281156*(10**(-5)) ) * Ta*Ta*D_Tmrt*Pa*Pa +
              ( -7.14663943*(10**(-7)) ) * Ta*Ta*Ta*D_Tmrt*Pa*Pa +
              ( -2.66016305*(10**(-4)) ) * va*D_Tmrt*Pa*Pa +
              ( 2.63789586*(10**(-4)) ) * Ta*va*D_Tmrt*Pa*Pa +
              ( -7.01199003*(10**(-6)) ) * Ta*Ta*va*D_Tmrt*Pa*Pa +
              ( -1.06823306*(10**(-4)) ) * va*va*D_Tmrt*Pa*Pa +
              ( 3.61341136*(10**(-6)) ) * Ta*va*va*D_Tmrt*Pa*Pa +
              ( 2.29748967*(10**(-7)) ) * va*va*va*D_Tmrt*Pa*Pa +
              ( 3.04788893*(10**(-4)) ) * D_Tmrt*D_Tmrt*Pa*Pa +
              ( -6.42070836*(10**(-5)) ) * Ta*D_Tmrt*D_Tmrt*Pa*Pa +
              ( 1.16257971*(10**(-6)) ) * Ta*Ta*D_Tmrt*D_Tmrt*Pa*Pa +
              ( 7.68023384*(10**(-6)) ) * va*D_Tmrt*D_Tmrt*Pa*Pa +
              ( -5.47446896*(10**(-7)) ) * Ta*va*D_Tmrt*D_Tmrt*Pa*Pa +
              ( -3.59937910*(10**(-8)) ) * va*va*D_Tmrt*D_Tmrt*Pa*Pa +
              ( -4.36497725*(10**(-6)) ) * D_Tmrt*D_Tmrt*D_Tmrt*Pa*Pa +
              ( 1.68737969*(10**(-7)) ) * Ta*D_Tmrt*D_Tmrt*D_Tmrt*Pa*Pa +
              ( 2.67489271*(10**(-8)) ) * va*D_Tmrt*D_Tmrt*D_Tmrt*Pa*Pa +
              ( 3.23926897*(10**(-9)) ) * D_Tmrt*D_Tmrt*D_Tmrt*D_Tmrt*Pa*Pa +
              ( -0.0353874123 ) * Pa*Pa*Pa +
              ( -0.221201190 ) * Ta*Pa*Pa*Pa +
              ( 0.0155126038 ) * Ta*Ta*Pa*Pa*Pa +
              ( -2.63917279*(10**(-4)) ) * Ta*Ta*Ta*Pa*Pa*Pa +
              ( 0.0453433455 ) * va*Pa*Pa*Pa +
              ( -0.00432943862 ) * Ta*va*Pa*Pa*Pa +
              ( 1.45389826*(10**(-4)) ) * Ta*Ta*va*Pa*Pa*Pa +
              ( 2.17508610*(10**(-4)) ) * va*va*Pa*Pa*Pa +
              ( -6.66724702*(10**(-5)) ) * Ta*va*va*Pa*Pa*Pa +
              ( 3.33217140*(10**(-5)) ) * va*va*va*Pa*Pa*Pa +
              ( -0.00226921615 ) * D_Tmrt*Pa*Pa*Pa +
              ( 3.80261982*(10**(-4)) ) * Ta*D_Tmrt*Pa*Pa*Pa +
              ( -5.45314314*(10**(-9)) ) * Ta*Ta*D_Tmrt*Pa*Pa*Pa +
              ( -7.96355448*(10**(-4)) ) * va*D_Tmrt*Pa*Pa*Pa +
              ( 2.53458034*(10**(-5)) ) * Ta*va*D_Tmrt*Pa*Pa*Pa +
              ( -6.31223658*(10**(-6)) ) * va*va*D_Tmrt*Pa*Pa*Pa +
              ( 3.02122035*(10**(-4)) ) * D_Tmrt*D_Tmrt*Pa*Pa*Pa +
              ( -4.77403547*(10**(-6)) ) * Ta*D_Tmrt*D_Tmrt*Pa*Pa*Pa +
              ( 1.73825715*(10**(-6)) ) * va*D_Tmrt*D_Tmrt*Pa*Pa*Pa +
              ( -4.09087898*(10**(-7)) ) * D_Tmrt*D_Tmrt*D_Tmrt*Pa*Pa*Pa +
              ( 0.614155345 ) * Pa*Pa*Pa*Pa +
              ( -0.0616755931 ) * Ta*Pa*Pa*Pa*Pa +
              ( 0.00133374846 ) * Ta*Ta*Pa*Pa*Pa*Pa +
              ( 0.00355375387 ) * va*Pa*Pa*Pa*Pa +
              ( -5.13027851*(10**(-4)) ) * Ta*va*Pa*Pa*Pa*Pa +
              ( 1.02449757*(10**(-4)) ) * va*va*Pa*Pa*Pa*Pa +
              ( -0.00148526421 ) * D_Tmrt*Pa*Pa*Pa*Pa +
              ( -4.11469183*(10**(-5)) ) * Ta*D_Tmrt*Pa*Pa*Pa*Pa +
              ( -6.80434415*(10**(-6)) ) * va*D_Tmrt*Pa*Pa*Pa*Pa +
              ( -9.77675906*(10**(-6)) ) * D_Tmrt*D_Tmrt*Pa*Pa*Pa*Pa +
              ( 0.0882773108 ) * Pa*Pa*Pa*Pa*Pa +
              ( -0.00301859306 ) * Ta*Pa*Pa*Pa*Pa*Pa +
              ( 0.00104452989 ) * va*Pa*Pa*Pa*Pa*Pa +
              ( 2.47090539*(10**(-4)) ) * D_Tmrt*Pa*Pa*Pa*Pa*Pa +
              ( 0.00148348065 ) * Pa*Pa*Pa*Pa*Pa*Pa
      return UTCIapprox
    }
    
    updateUTCI = function(){
      // Calculate UTCI from inputs
      var UTCI =  calcUTCI(Ta, Tmrt, va, RH)
			
      d3.select(".utcidisplay").remove()
      
      svg.append("text")
        .text("UTCI = " + ((Math.round(UTCI*10))/10).toString() + ' C')
      	.attr("class","utcidisplay")
        .attr("y", 50)
        .attr("x", 350)
        .attr("font-size", 36)
        .attr("font-family", "sans-serif")
    }
    
    // Display the resulting UTCI in the render pane.
    var svg = d3.select("body").append("svg")
    .attr("width", 960)
    .attr("height", 100)
    svg.append("text")
        .text("")
        .attr("class","utcidisplay")
    
     updateUTCI()
    
  </script>
</body>

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

https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js

https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js