two-dimensional array

Question

I can't understand that how can we take two values in array and get average....

a program that uses a two-dimensional array to store the highest and lowest temperatures read from the user for each

month of the year. The program should output the following:

1. Average high temperature for the year

2. Average low temperature for the year

3. Highest high temperature for the year

4. Lowest low temperature for the year

please help me.