How to convert hourly data to monthly average?

Hi, I made a table which its first column shows date and time(every 3 hours) and its second column shows Wave Height collected on that day and time. I need to convert it to monthly data and take the average. I have attached a screen shot. If you could take a look and help me with that, I would really appreciate it.

Regards Ali

Answer 1

[Sean de Wolski]

tt = table2timetable(wavetable);
retime(tt,'monthly','mean')

Time tables make this type of work super straightforward.

[Ali Saremi]

IT worked. Thank you so much. I appreciate it. Regards Ali