ERA5 data download and access

We are going to use monthly averaged surface variables from ERA5.

Four variables:

• 2m_temperature

• sea_surface_temperature

• mean_sea_level_pressure

• total_precipitation

We can download all this from the awesome Copernicus Climate Data Store

• Script to do the whole download (about 8Gb, will take a few hours). Only downloads data where it is not already on disc.

• Script to download a year of ERA5 data.

Having downloaded the data, we need to use it. So we need some convenience functions to access the data.

• Functions to access downloaded ERA5 data.