Calculate Mean /Average of 4D data

I have a 4D data of speed. Size is (301x246x48x119).followed by (latitude, lontitude, height, month). Now I want to calculate Mean from this data.

1st I want to mean speed to remove latitude and lontitude. And after that I want to separate the data by monthwise. After that I will mean data for month.(Here 12 month is used circularly)

Can you please Help me how can i do this?

My final target is to find 12(month) dataset where each dataset contain one speed for every height.

[Jan]

You forgot the step, in which you calculate the speed from latitude and longitude.

[Adam Danz]

> each dataset contain one speed for every height

Could you provide your data? What if heights are [4.5, 4.51, 4.511,...] is that one height of 3 heights?