Grid stack is too large to store on GitHub

The gridded time series temp data is too large to store in GitHub, so for this example, implement the time series data that does NOT vary in space.

Previous syntax caused issues in cases where T was scalar/time series rather than grid. Yes, this allocates to new memory rather than overwriting the previous value in the same memory space (this should be improved later), but for user friendliness out-of-the-box, I think this is the best option for now.