sorting an array of class objects

I am writing a program that reads a file that contains daily temperatures for a given month and reports to the UI the High, and Low temps, but i cannot figure out how to sort the temperatures. I have created a class separate from my main. Here is the code for my class

   namespace Program_4
{
public class Day
{
    public double _temp;

    //constructor
    public Day()
    {
        _temp = 0.0;
    }

    //collect the temps
    public double Temp
    {
        get { return _temp; }
        set { _temp = value; }
    }


}
} 

and here is the code for my main, how do i sort this and return the high and low values to the UI? I am simply using labels to report the values

    namespace Program_4
{

public partial class MainForm : Form
{
    // 
    public MainForm()
    {
        InitializeComponent();

    }
    //Declare Input File
    StreamReader inputFile;


    //Select File
    private void btnSelectFile_Click(object sender, EventArgs e)
    {
        openFileDialog1.ShowDialog();

        if (openFileDialog1.ShowDialog() == DialogResult.OK)
        {
            inputFile = File.OpenText(openFileDialog1.FileName);
            txbxFile.Text = openFileDialog1.FileName;
        }
        else
        {
            FileError openFileError = new FileError();
            openFileError.ShowDialog();
        }
        Clear();
    }

    //Clear Labels
    private void Clear()
    {
        lblAvg.Text = string.Empty;
        lblLow.Text = string.Empty;
        lblHigh.Text = string.Empty;
    }

    //Report Totals
    private void btnReport_Click(object sender, EventArgs e)
    {
        //Create array to store monthly data
        const int MONTHDAY = 33;

        string month;
        int count = 0;
        double dailyTemp, totalTemp = 0.0, avgTemp;//highest, tempTrackerHigh = -500, tempTrackerLow = 500, tempHolderHigh = 0, tempHolderLow = 0;

        //Create an instance of the Day class
        Day[] days = new Day[MONTHDAY];

        //Get the month
        month = inputFile.ReadLine();

        //Continue reading the file
        while (!inputFile.EndOfStream)
        {
            if (double.TryParse(inputFile.ReadLine(), out dailyTemp));

            for (int index = 0; index < days.Length; index++)
            {
                days[index] = new Day();
                count++;
            }
            foreach (Day aDay in days)
           {
             totalTemp += dailyTemp;
           }
            avgTemp = totalTemp / count;
            lblAvg.Text = "The average temp was " + avgTemp.ToString("f2");
            Day[] sorted = days.OrderBy(c => c._temp).ToArray();
            label1.Text = days[1]._temp.ToString("f0");

        }



    }


  }

}