How to sum up numbers from .txt file

I have a .txt file with precipitation data from one year as shown below. The columns shows year,month,day,hour,minute and the amount of precipitation.

2014,01,01,02,14,0.100 
2014,01,01,02,24,0.100 
2014,01,01,02,31,0.100 
2014,01,01,02,44,0.100 
2014,01,01,03,02,0.100 
2014,01,01,03,29,0.100 
2014,01,01,03,57,0.100

The precipitation has been measured each minute. I want to sum up the data so that I can find precipitation for 5 minutes, 30 minutes, 1 hour, 1 day and so on.

So for the data shown here, if I want to sum up the data for one hour I want to get an output like

2014,01,01,02,0.4
2014,01,01,03,0.3

I need this because I need to find the maximum precipitation for different time intervals during a year.

Answer 1

[Andrei Bobrov]

f = fopen('name_of_your_txt_file.txt');
c = textscan(f,'%d %d %d %d %d %f','delimiter',',','CollectOutput' ,1);
fclose(f);
[a,b,c1] = unique(c{1},'rows');
out = [double(a),accumarray(c1,c{2})];

Answer 2

[Sigrid Johansen]

That works! Thank you!

With this I understand how to calculate the maximum precipitation for 1 hour, 1 day and 1 month. But how do I get the max value for 5 minutes, 30 minutes, 6 hours and so on?