a table wich contains montsh repetedly and the days store a value

Dictionary<string, int> months = new Dictionary<string, int>();

months.Add("Jan", 31);
months.Add("Feb", 28);
months.Add("Mar", 31);
months.Add("Apr", 30);
months.Add("May", 31);
months.Add("Jun", 30);
months.Add("Jul", 31);
months.Add("Aug", 31);
months.Add("Sep", 30);
months.Add("Oct", 31);
months.Add("Nov", 30);
months.Add("Dec", 31);