Facetgrid in seaborn customizing colours in legend

Question

I have 4 columns in a dataframe: Country, City, Year and Temperature. I want to make plot as I did with this command:

g =sns.FacetGrid(grouped,col='Country',hue='City', col_wrap=3)
g = g.map(plt.plot,"year", "AverageTemperatureCelsius")

Now I can add a legend with:

g.add_legend(title='$\\bf{City}$',handlelength=1,prop={'size': 16})

Resulting in a plot like this:

But I want legend to be countries, meaning I would like the labels to be:

label=['Brazil', 'France',    'Japan',  'New Zealand', 'Poland', 'South Africa','Sweden', 'Ukraine']

And at each subplot there would be one colour, how can I achieve that?

The result I am after:

Answer 1

Setting hue=None should both make all of the subplots the same color, and change the legend to display your column data instead.

The 'hue' argument selects a subset of your data to emphasize in the subplots, docs here .

Edit: if you want to keep the hue parameter, but have it plot all the same colors, you can use keyword arguments.

colors = {'colors': ['b']} 
g =sns.FacetGrid(grouped,col='Country',hue='City',hue_kws= colors, col_wrap=3)

To then fix the legend, this answer puts it really nicely.