using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.IO;

public class Program

{

    public static List<string> FindMonthlyAverage(string filename) //returns a list of strings containing the monthly avg

        {

            List<double> hightemps = FindTemps(filename);

            List<DateTime> datetemp = FindDates(filename);

            List<string> result = new List<string>();

​

            int j = 0;

            while (j < datetemp.Count) //gets avg for every month

            {

                double monthlytotal = 0;

                for (int i = 0; i < DaysInMonth(datetemp[j]); i++) //gets avg for one month

                {

                    monthlytotal += hightemps[i];   //error checking needed still                      

                }

                double monthlyavg = monthlytotal / DaysInMonth(datetemp[j]);

                result.Add($"The average high temperature for the month of {datetemp[j].ToString("MMM yyyy")} is {monthlyavg}");

                j += DaysInMonth(datetemp[j]);

            }

            return result;

        }

}