I have many directories of weather data containing lots of .csv files (hundreds of thousands) I developed a script that went through and changed a character in each filename of a particular type so that I could isolate particular files easier. Now I need to look in those files and pull out ONE field of data, I am looking for either the highest or lowest temperature on a given date.
Typical data in the files looks like this

#2015-01-31 03:00:04#,19.49

I need to concentrate on the 19.49 field. Only 2 fields in these particular files.

Thanks to all