I did the following procedure for my paper:

We needed hourly weather data for all years. But, we had only for some years this data. For most years we had 3-hour data. Therefore, I needed to interpolate 3-hour data to make hourly ones.

But I should have checked the accuracy of the interpolation method. Therfore, I did this procedure:

I had a set of hourly weather data.

I eliminated 2/3 of the data (two points in each 3 hours) and made a 3-hour data. (I made Artificial gaps)

Then, I interpolated this set in order to make an hourly set.

Finally, I checked the accuracy of this interpolation by RMSE.

Is this cross validation?

Thanks