将多个NetCDF文件合并到时间序列多维数组python中

I am using data from multiple netcdf files (in a folder on my computer). Each file holds data for the entire USA, for a time period of 5 years. Locations are referenced based on the index of an x and y coordinate. I am trying to create a time series for multiple locations(grid cells), compiling the 5 year periods into a 20 year period (this would be combining 4 files). Right now I am able to extract the data from all files for one location and compile this into an array using numpy append. However, I would like to extract the data for multiple locations, placing this into a matrix where the rows are the locations and the columns contain the time series precipitation data. I think I have to create a list or dictionary, but I am not really sure how to allocate the data to the list/dictionary within a loop. I am using data from multiple netcdf files (in