Edit in JSFiddle

$.ajaxSetup({
	type: "POST",
	contentType: "application/json; charset=utf-8",
	cache: false,
	dataType: "json",
	xhrFields: {
		withCredentials: true
	}
});

$.ajax({url: "https://www.mytaglist.com/ethLogShared.asmx/GetLatestTemperatureRawDataByUUID",
        data: JSON.stringify({uuid: "0f32cb87-eb86-4a60-9e66-e0cfd661cba1"}),
        success: function (retval, textStatus) {
            $("#displayx").text(((retval.d.temp_degC * 1.8) + 32).toFixed(2));
            $("#datetime").text(retval.d.time);
        },
        error: function (xhr, textStatus, exception) {
            alert(textStatus);
        }
       });


        

<span id="displayx"></span> &deg;F  <br><span id="datetime"></span>