...

print(mv.latitudes(t2m))
print(mv.values(t2m))
df = t2m.to_dataframe()
print(df)
print(df.describe())

If you have extra time...

Have a look in the solutions folder - there is a script called field_values_at_gpts_locations.py. This does several things, including using geopoints as a set of locations to extract values from a GRIB field, computing the differences between geopoints and GRIB fields, and plotting the differences to a PDF file.