I have many csv files and I need to calculate the average value of a particular each particular cell. A simplified example of these csv files are below. In my actual files there is more than one value field but for simplicity's sake I only put one for the example.

File0.csv:

`Latitude, Longitude, Value
23, 97, 1
24, 97, 5
25, 97, 6
26, 97, 4`

File1.csv: 

`Latitude, Longitude, Value
23, 97, 7
24, 97, 4
25, 97, 2
26, 97, 9`

Each of the files has the same lat/lons and the same number of rows/columns, I just need to create a new csv that contains the average values at each lat/lon.

An example of the desired output csv:

`Latitude, Longitude, Value
23, 97, 4
24, 97, 4.5
25, 97, 4
26, 97, 6.5`

Another note: I do have some NoData values within my csv files (given a value of -999.9) which may create some averaging issues.