How to read a Temperature for August and get the total Aveg

Question

Hi there

 

How to read a Temperature for August and get the total Aveg just for 29 day instead 31 day ?

 

i want to get the Aveg Temperature of August which has 31 day but sometime there is a data of temp just for 29 or 27 however how could i get the Avag based on how many days has been read and saved as data that could be (29,27,26 or 10 days) ?

 

here is the code :

public static TheWeather GetAverageForMonth(List<TheWeather> entries, int year, int month)
{
if (entries == null || entries.Count < 1)
return null;
int days = 0;
int index = entries.Count();
double total = 0.0;
double Aveg = 0.0;
for (index = 0; index < entries.Count; index++)
{
if (entries[index].dateTime.Year == year && entries[index].dateTime.Month == month)
{
total += entries[index].Actual_mean_temp;
days = entries[index].dateTime.Day;
}
}
Aveg = total / days;
return entries[index];